The protein that inhibits transcription of the lac operon is a tetramer with four identical subunits called lac repressor.
The lactose operon (lac operon) is a lactose transport and metabolism operon found in E. coli and many other intestinal bacteria. Although glucose is the preferred carbon source for most bacteria, the lac operon allows for successful lactose digestion when glucose is unavailable via beta-galactosidase activity. Because gene regulation of the lac operon was the first fully characterized genetic regulatory system, it has become a leading example of prokaryotic gene regulation.
For this reason, it is frequently covered in beginning molecular and cellular biology lectures. François Jacob and Jacques Monod used this lactose metabolism system to figure out how a biological cell knew which enzyme to manufacture. Their work on the lac operon was recognized.
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What is/are the main purpose(s) of meiosis? (select all that apply)
Control metabolism
✔Halve the number of chromosomes in a cell
Generate genetic diversity
Create gametes
Synthesize energy
Organism growth
Tissue repair and maintenance
Answer:
Halve the number of chromosomes in a cell.
Create gametes.
Explanation:
Meiosis is a cell division process where the parent cell divides to give four daughter cells, each containing half the number of chromosomes. It is also called as reductional division. It is important for reproduction as meiosis is the sole way for germ cells to form sperm or eggs.
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The main purposes of Meiosis include reducing the number of chromosomes in a cell by half, generate genetic diversity, and creation of gametes. Thus, the correct options are B, C, and D.
What is Meiosis?Meiosis is a special type of cell division which is also known as reductional division. It occurs in the germ cells in the sexually-reproducing organisms that involves the formation of the gametes, such as sperm or egg cells. Meiosis involves two rounds of division which are Meiosis I and Meiosis II, which ultimately results into formation of four daughter cells with only one copy of each chromosome.
Meiosis is an important type of cell division for three main reasons which are sexual reproduction of diploid organisms in which it produces gametes, it enables genetic diversity in sexually reproducing organisms, and it reduces the chromosome number in the daughter cells by half.
Therefore, the correct options are B, C, and D.
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The assistance you provide a resident with dementia will not change
throughout the progression of the disease.
False because as the diseas
If all of the large, dead trees
were removed from the
ecosystem, what would
happen to the barred owl
population in that ecosystem?
A. The barred owl population in that ecosystem would stay the same size.
B. The size of the barred owl population in that ecosystem would decrease.
C. There would be no change in the barred
owl population.
D. The amount of barred owls the ecosystem can support would increase.
The size of the barred owl population in that ecosystem would decrease.
Reduced biodiversity, or the variety and richness of various kinds of animals and plants in a given setting, is the main consequence of habitat degradation. An animal's population rapidly declines as it draws closer to extinction when it loses the habitat or natural home that it requires to survive.A proportional drop in the number of animals inhabiting a given landscape is predicted to result from habitat destruction. One might anticipate a drop in animal abundance of 50%, for instance, if 50% of a forest environment that supports a big population of an animal is destroyed.similarly, If all of the large, dead trees were removed from the ecosystem, The size of the barred owl population in that ecosystem would decrease.learn more about ecosystem here:
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Why is water a good solvent?
A. The hydrogen bonds in water provide a network for substances to dissolve into and become trapped.
B. It is polar, and the positive and negative areas attract other polar molecules and pull them apart.
C. It is nonpolar, and the positive and negative areas attract other polar molecules and pull them apart.
D. The hydrogen bonds between water molecules are weak so they can break easily to bond to a substance that is dissolved in the water instead.
The water a good solvent because It is polar, and the positive and negative areas attract other polar molecules and pull them apart, which means the letter B.
Why is water the universal solvent?Water is known as the universal solvent because it dissolves almost all substances that exist in nature. There are several types of solutions made with this solvent. Substances that dissolve in water are called water-soluble.
The water is a good solvent because of its polarity and ability to form hydrogen bonds, water makes an excellent solvent, meaning that it can dissolve many different kinds of molecules.
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______ are short segments of DNA that carry the instructions to build a specific protein.
a. DNA
b.Ribosome
c. RNA
d. Genes
The higher the standard of living for a population, the
the carrying capacity.
Select one:
O a. higher
O b. lower
It is important to learn effective ways to give feedback to be an effective communicator and professional. For this
discussion, think about the 4-Step formula from the lecture. Read the scenario below, then answer the prompts.
Scenario:
Jade is a senior marketing coordinator at a large communications company. One of Jade's responsibilities is to mentor
newly hired employees like Carla. Two weeks after Carla is hired, Jade notices that Carla's email messages are
sometimes too informal. As her mentor, Jade decides to give Carla feedback to help her improve.
Hi Carla,
I saw your recent report to the manager. I know that you are supposed to send me the reports to proofread for you, but I kind of assumed you would proofread
them for basic errors before you sent them to me. I think we all were hired because we know how to use professional communication skills, so I was kind of
hoping you would do a better job of fixing your report for major errors before you sent it to me. Can you start doing that please? I am really finding it time
consuming to fix mistakes you could have spotted easily.
1. Describe if you felt Jade's feedback was effective or not based on what you learned about feedback from the lecture.
2. List suggestions on how Jade could improve her feedback to Carla.
No, I don't think that Jade's feedback was effective because she was not very direct.
What is Feeback?This refers to the response that is given to a person based on a query and is a part of effective communication.
Therefore, some suggestions that Jade can use to improve her feedback to Carla are:
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Which results from an increase in the greenhouse effect?
Answer:
nitrogen?
Explanation:
Burning fossil fuels like coal and oil puts more carbon dioxide into our atmosphere. NASA has observed increases in the amount of carbon dioxide and some other greenhouse gases in our atmosphere. Too much of these greenhouse gases can cause Earth's atmosphere to trap more and more heat. This causes Earth to warm up.
Carbon dioxide (CO2) makes up the vast majority of greenhouse gas emissions from the sector, but smaller amounts of methane (CH4) and nitrous oxide (N2O) are also emitted. These gases are released during the combustion of fossil fuels, such as coal, oil, and natural gas, to produce electricity.
Using the Punnett square that you created in question number 5, what is the probability that the resulting child will be heterozygous for Huntington’s disease ?
A. 25%
B. 50%
C. 75%
D. 100%
Huntington’s disease is an autosomal dominant affection. Parental's genotype FF and ff. Cross: FF x ff. F1) 100% Ff, heterozygous individuals (Option D).
What is the Huntington’s disease?
Huntington's disease is caused by a mutation in the gene that codifies the Huntington protein (Htt).
The mutation produces an altered form of the protein leading to the neuron death in certain brain areas.
Huntington's disease characterizes for being,
Hereditary, passing from generation to generation. To express the disease the person must have been born with an altered gene.Autosomal, affecting men and women equally because the mutated gene is located on an autosomal chromosome.
Dominant, meaning that by inheriting only one copy of the altered gene from any of the parents, the receiving person will express the disease. The mutation in the gene dominates over the normal gene copy.Expressed by heterozygosis. Most people affected by the disease are heterozygous, with a normal copy and a mutated copy.
Question number 5
To produce only individuals with the genotype Ff, the parentals genotypes must be homozygous dominant and recessive. This is,
Cross: The cross is done between one homozygous recessive and one homozygous dominant individual
Parentals) FF x ff
Gametes) F F f f
Punnett square) F F
f Ff Ff
f Ff Ff
F1) 100% of the progeny is expected to be heterozygous Hh, expressing Huntingnot's disease.
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What are the impacts of that process of production
on the environment, on society and
on individuals?
Answer:
Lack of distinctive advantage in product performance and price.
Over estimation of the target market which may result in low demand.
Inability to utilize company strength to capture profitable opportunities.
Unpredictable change in consumers preference for goods and services.
Negative Effects of Production on Environment and Society. It leads to the pollution of the environment (environmental pollution) It leads to erosion as a result of big holes created by construction industries.
Explanation:
hope this helps you, sorry if it is not what you are looking for.
How many nitrogen bases are there in the codon for one
amino acid?
A 1
B 2
C 3
D 4
Answer:
C.) 3
Explanation:
A codon consists of three nucleotides. Each nucleotide has one nitrogen base. Therefore, one codon has three nitrogen bases.
Drag one black mouse and one white mouse in into the parent squares. What is the phenotype of all of the offspring?
A.Ff
B.Ff
C.Black
D.ff
E.white
Assuming that the allele for black is dominant over white, phenotype of the offspring will be black.
What is the phenotype of the offspring?The phenotype of the offspring of the cross between a black mouse and a white mouse is given below:
Assuming that the parents are pure breeds and that the allele for black is dominant over white, the allele for white is w and black is W.
The offspring of the cross is as follows:
WW x ww = Ww, Ww, Ww, WwThe phenotype of the offspring will be black.
In conclusion, the phenotype of the offspring depends in the genotype of the parents.
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Occurs when the individual inherits only one (female) X Occurs when the individual inherits only one (female) X chromosome
Turner syndrome occurs when the individual inherits only one (female) X chromosome.
What is Chromosome?This is referred to a thread like structure which contains DNA and protein components.
An individual inheriting only one female X chromosome means that the child will have turner syndrome which is characterized by short height, heart defects etc.
The complete question is:
Which condition occurs when the individual inherits only one (female) X chromosome?
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in my investigation, i saw that it can cause the growth of algal blooms which can be toxic to wild life and humans. this could also mess with marine life habitats such as coral reefs and more
Answer:
hi I am new pls follow me
Using the Punnett square that you created in question number 5, what is the probability that the resulting child will develop Huntington’s disease? Remember Huntington’s disease is an autosomal dominant disease meaning the presence of a dominant allele results in the development of the disease
A.25%
B.50%
C.75%
D.100%
Huntington’s disease is an autosomal dominant disease, thereby the probability that a child will develop the disease is 100% if one parent has one mutated allele (Option D).
What is an autosomal dominant disease?An autosomal dominant disease is any inherited disorder that is expressed in the phenotype in heterozygous individuals.
The mutated allele that causes autosomal dominant diseases is dominant and masks the expression of the recessive allele.
In conclusion, the probability that a child will develop the disease is 100% if one parent has one mutated allele (Option D).
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What is the best description of the word ‘Variation’ in biology?
A. Differences between individuals of a species, and between different species.
B. Change over time of a species.
C. The differences between different parts of the same organism.
D. A large group of completely different items.
Place the steps of endochondral ossification in order, starting with the creation of a cartilage model and ending with the presence of epiphyseal plates between the diaphysis and epiphysis.
Answer bank:
1. The diaphysis center is vascularized, and osteoblasts deposit osteoid over calcified cartilage matrix.
2. Spongy bone and the medullary cavity form in the diaphysis.
3. Spongy bone forms in the epiphysis.
4. The epiphyseal center is vascularized, and osteoblasts deposit osteoid over calcified cartilage matrix.
5. A periosteal collar develops.
The correct steps of endochondral ossification is:
A periosteal bone collar develops.spongy bone and the medullary cavity form in the diaphysis.The diaphysis center is vascularized and osteoblasts deposit osteoid over calcified cartilage matrix.The epiphyseal center is vascularized and osteoblasts deposit osteoid over the calcified cartilage matrix.The spongy bone forms in epiphysis.Which bones grow by endochondral ossification?Long and short bones, such as the phalanges and femur, arise from a cartilage model formed by endochondral ossification. Distinguishing between these two types of osteogenesis does not imply the existence of multiple types of bone tissue.
Endochondral ossification mainly forms in two stages: modifications of the hyaline cartilage that ends with the death of chondrocytes and invasion of osteogenic cells and their differentiation into osteoblasts in the cavities previously occupied by chondrocytes for deposition.
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Leaves absorb oxygen to make food
True or false
Answer:
false *
Explanation:
because leaves prepare their food by using raw materials .
Of the following choices, what is the approximate LD50 of the least toxic substance? 20 mg/kg, 70 mg/kg, or 130 mg/kg
The approximate LD50 of the least toxic substance will be 130 mg/Kg.
The dose necessary to cause the death of 50% of a population under test after a predetermined test period is known as the LD50 value for a drug. Commonly used as a broad indicator of a substance's acute toxicity are LD50 values. Greater toxicity is indicated by a lower LD50. A low LD50 of 500 mg/kg or less implies severe toxicity. Moderate toxicity is indicated by an LD50 of 500 to 1,000 mg/kg. A modest toxicity level of 1,000 to 2,000 mg/kg is indicated.The species is especially vulnerable to the poison if the LD50 is low. The lethal dose (LD50) of a specific poison might change significantly between several animal species.Thus out of all the options, LD50 130 mg/kg will have the lowest toxicity and 20 mg/kg will be the highest.learn more about LD50 here: https://brainly.com/question/24845532
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6. What asexual reproduction process is utilized by Eubacteria?
A. binary fission
B. RNA production
C. ribosome creation
D. agamogenesis
What is true about the thickness of the ozone layer?
It has gradually decreased in the last couple of years.
It has remained the same in the last couple of years.
It has entirely disappeared in the last couple of years.
It has gradually increased in the last couple of years.
Answer:
A
Explanation:
The top answer is correct, over time it has become weaker.
Answer: The answer is A (It has gradually decreased in the last couple of years)
Over the Earth's surface, the ozone layer's average thickness is about 300 Dobson Units, or a layer that is 3 millimeters thick.The thickness of the ozone layer changes due to increasing concentrations of ozone-depleting substances in the atmosphere.Air motions also increase the ver- tical thickness of the ozone layer near the poles, which increases the value of total ozone in those regions. Tropospheric weather systems can temporarily reduce the thickness of the stratospheric ozone layer in a region, low- ering total ozone at the same time.It is thinning due to the release of man-made compounds called chlorofluorocarbons (CFC). The net effect that CFCs have on the ozone layer is to recombine an oxygen atom with an ozone molecule to form two oxygen molecules. From 1978 to 1991, global stratospheric ozone levels have decreased by 3%.Epkin why stored seeds must be kept dir drys
What happened to the music industry between and 1987
The music industry between 1980 and 1987 experienced an increase in quality and competition.
What is Intellectual Property Antitrust Protection Act of 1987?This was set up by the government to cater for the consumer welfare by ensuring quality was made priority over quantity.
There was an increase in quality and competition due to intellectual property laws which led to the music industry experiencing a positive turnaround.
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Insulin is an important hormone that allows the body to use glucose from food. After an individual eats a meal, glucose travels through the blood stream and reaches beta cells in the pancreas. The glucose causes the beta cells to release insulin. Insulin then travels through the blood stream and attaches to insulin receptors on other cells, which allows them to take in glucose and use it for energy.
What does this information best demonstrate?
A.
Cells interact with other cells for regulation and homeostasis.
B.
A hormone is a protein that performs many functions in the body.
C.
Only certain cells can use glucose to produce energy.
D.
Beta cells are not necessary for glucose to be utilized.
The best-demonstrated information is
A. Cells interact with other cells for regulation and homeostasis.
C. Only certain cells can use glucose to produce energy.
One of the important hormones in the human body is insulin. How the human body uses food to meet its energy needs is explained by knowledge of insulin and its workings.
Typically, food-derived glucose that enters the bloodstream is what causes blood sugar levels to rise. The pancreas is a gland that aids in the release of insulin to regulate blood sugar levels. Based on the blood sugar level, insulin often releases itself in a feedback system.
The insulin mechanism best exemplifies the following:
Together with glucagon, insulin contributes to the maintenance of the constant condition known as homeostasis in the human body.Considered essential for cells to use glucose and obtain energy is insulin.As a result, the mechanism of insulin in the human body shows how various cells use energy and how insulin is crucial for preserving homeostasis.
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explain in steps how a tree trunk gets wider
Answer:
The first thing that determines the thickness of a tree trunk is the species. Some kinds of trees just naturally have a different trunk thickness than others.
The second thing might be the environment. A tree that is experiencing all factors - sun, water, soil, minerals - at an optimum level is going to grow faster, taller, stronger, and thicker than the same species in a less-optimum environment.
A third factor is time. As time passes, the tree trunk increases in diameter - thus a tree that is 50 years old will have a much thicker trunk than one that is 5 year old.
And, in case you’re wondering why or how tree trunks increase in thickness at all, there is a thin layer of cells all around the trunk of a tree, like a sheet that lives under the bark. This layer is called the cambium layer which makes new living tissue for the tree (called phloem and xylem) every year. As the year’s growth comes to an end, the living tissue dies and is pushed outward to appear as bark by the new year’s sheet of cambium cells, which is bigger than the previous year’s - hence, the increase in diameter of the tree every year.
Type the correct answer in the box. Spell the word correctly.
What type of atmosphere was present on the Earth in early ages?
Billions of years ago, the atmosphere on the Earth did not have free oxygen.
Scientists call it highly (blank) atmosphere.
(Plato)
The type of atmosphere present on the early ages of the Earth was, basically, made of gases expelled from vulcanoes.
What is atmosphere?
Atmosphere is the layer of air that surrounds our planet. Other planets in the solar system also have an atmosphere. The gases that make up the atmosphere are held around the Earth by the pull of gravity and follow its motion.
In the primitive atmosphere, there was no presence of gases such as oxygen. The abundant gases were methane, carbon dioxide, nitrogen and even gases composed of poisonous substances. It had high temperatures and had the Sun as the main source of energy.
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Billions of years ago, Earth's atmosphere lacked free oxygen.
Scientists call this a highly toxic atmosphere.
What kind of atmosphere was present on Earth in early times?In the atmosphere of the primitive Earth there was no oxygen (O2) and nitrogen (N2), the air being composed of gases such as
methane (CH4)ammonia (NH3)hydrogen (H2) and water vapors (H2O).With this information, we can conclude that Early Earth's atmosphere may have been as toxic as that of Venus today. Earth is the only planet that harbors life (as far as we know)
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Special senses are senses that have a specialized organ associated with them. Do you think we could have more senses?
Special senses are senses that have a specialized organ associated with them. we could have more senses, with some specialized organs, like the snake, which has chemical sensors in the tongue.
What is the snake tongue sensor?It's your main sensor. The odor molecules are captured by the tongue, sent to the inside of the mouth, where they are captured by two sensors located at the right and left ends of the palate, and the information is passed on to the brain. Through this information that is sent to the brain, the animal can distinguish whether its prey is moving to the right or to the left. Using this method, a snake can more effectively find and capture its prey.
With this information, we can conclude that we could have more senses, with some specialized organs, like the snake, which has chemical sensors in the tongue.
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Scientific question: Why does a dog circle its
bed before lying down?
Write the steps you would take to explore this
question using the scientific method.
Answer:
Explanation:
In the scientific method first of all is you need to identify the problem, the problem to your question is why does the dog circle its bed before lying down. Second is the observation to gather some data, you need to observe the dog if what could be the possibility the the dog may do that action. The third is the pre hypothesis, you need to came up with an idea why does the dog do such and action for example the needs to find a correct spot to make itself comfortable and lastly the hypothesis, this should answer to your question or your problem. So my hypothesis is that dogs are one of the animals that are those difficult to find a place to sleep and some of that kind of animals are cat, before they lay on their bed, they have to circle to find a spot that could fit its body to be more comfortable when the dog sleep.....
gamma ray
microwave
rapido wave
ray
Answer:
radio wave
Explanation:
1km = 1000 metres, or 10³, so it must be a radio wave
In which region would you find the BEST top soil
options: A-tropical
B- Artic
C-Temperate
D- Desert
The best topsoil will be found in the tropical region.
What are tropical regions?They are regions of the world located within the two tropics - tropic of Capricorn and tropic of Cancer.
The region is characterized by adequate precipitation and relatively warm annual temperature. Thus, there is a high diversity of plants and animal species.
Tropical forests are known as the biodiversity hotspots of the world. This means that the soil is rich enough to support a diverse species of plants as compared to other regions of the world.
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You would find the BEST topsoil in the Temperate region
C-TemperateHow is the soil in the temperate region?The soil of these forests is very rich in nutrients, mainly due to the natural process of leaf decomposition, which enriches the soil with nutrients. The accumulation of organic matter occurs mainly in the first horizons of the soil, which therefore have a darker color.
With this information, we can conclude that The soil of temperate region It is very rich in nutrients, mainly due to the natural process of decomposition of the leaves.
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