The diatoms below are magnified 400x. To find the total magnification while looking under a microscope, you must multiply the power of the eyepiece lens by the power of the ? *
Answers
Answer:
ll living things are composed of cells. This is one of the tenets of the Cell Theory, a basic theory of biology. This remarkable fact was first discovered some 300 years ago and continues to be a source of wonder and research today. Cell biology is an extremely active area of study and helps us answer such fundamental questions as how organisms function. Through an understanding of how cells function we can discover how human ailments, such as cancer and AIDS, can be possibly treated.
THE CELL THEORY
All life is composed of cells
Cells are the fundamental units which possess all the characteristics of living things
New cells can only come into existence by the division of previously existing cells
Notice that this scientific concept about life is called a theory. In science, unlike the layman’s definition, the word theory is used for a hypothesis about which there is a large body of convincing evidence. Under experimental conditions all observations have thus far confirmed the theory. The evidence that helped formulate the theory was obtained using the microscope. The microscope is of enormous importance to biology and has extended our ability to see beyond the scope of the naked eye.
When we look at cells under the microscope, our usual measurements fail to work. In science, the metric system is used to measure objects and, as you will see, is vastly superior to our antiquated English system of measurement. Here are the basic units:
Length Volume Weight
1 meter (m) 1 liter (L) 1 gram (g)
1 millimeter (mm) = 0.001 m or 10−3 m or 1/1,000 m 1 milliliter (ml) = 0.001 L or 10−3 L 1 milligram (mg) = 0.001 g or 10−3 g
1 micrometer (mm)= 0.000001 m or 10−6 m or 1/1,000,000 m 1 microliter (ml) = 0.000001 L or 10−6 L 1 microgram (mg) = 0.000001 g or 10−6 g
1 nanometer (nm)= 0.000000001 m or 10−9 m or 1/1,000,000,000 m
There is also a different scale for temperature: Celcius.
100˚ Celcius (C) = water boiling (equivalent to 212˚ F)
0˚ C = water freezing (equivalent to 32˚ F)
Converting between units can be confusing. The most effective way to do this is by using conversion factors and canceling units. For example, if you want to know how many liters are in 425 milliliters, you can set up a simple equation that looks like this.
[latex]\displaystyle{425}\text{ ml}\times\frac{1\text{ liter}}{1000\text{ ml}}=\frac{425\text{ ml}}{1000\text{ ml}}=0.425\text{ L}[/latex]
PRACTICE
1.2 mm = ________ mm 0.224 m = ________ mm 225 nm =___________mm
0.023 L = ________ ml 750 ml = _________L 50 ml =___________ L
Part 1: Microscope Parts
Nikon microscope with parts labelled. The compound microscope is a precision instrument. Treat it with respect. When carrying it, always use two hands, one on the base and one on the neck.
The microscope consists of a stand (base + neck), on which is mounted the stage (for holding microscope slides) and lenses. The lens that you look through is the ocular (paired in binocular scopes); the lens that focuses on the specimen is the objective.
Your microscope has four objectives of varying magnifications (4x, 10x, 40x, and 100x) mounted on a revolving nosepiece. The 100x objective is a special oil immersion objective that needs to be used with oil—we won’t use the oil immersion objective for this course.
Positioning the specimen requires that you turn the mechanical stage controls, which operate the slide bracket on the surface of the stage. One control moves the specimen in the x-direction, and the other moves the specimen in the y-direction.
Focusing on the specimen is achieved by knobs that move the stage up and down, so that it is closer or farther from the objective. There are two knobs, an outer coarse focus and an inner fine focus.
The substage condenser directs light through the slide into the objective. An iris diaphragm on the substage condenser controls the amount of light reaching the objective, and also affects the contrast of the specimen.
Part 2: Magnification
The compound microscope has two sets of lenses; the ocular lens (or eye piece) which magnifies an object 10 times its normal size, and the objective lenses located on a revolving nosepiece. Rotate the nosepiece and notice how each objective lens clicks into place. Each objective lens has a different magnification of power written on it (such as 4, 10, 40, or 100). This number is the power of magnification for each of the objective lenses. For total magnification multiply the ocular power (10x) times the objective lens that is in place. For example, if you have a 10x ocular and a 10x objective, the total magnification is: 10x × 10x = 100x.
Related Questions
Put an X next to all the statements that can be considered signs of global warming.
A. The concentration of CO2 is at 400 parts per million (ppm) today. It has never been more than 300 ppm in the past 800,000 years.
B. Global sea level rose about 6.7 in. in the past century. The rate in the past decade, however, is nearly double that of the past century.
C. Since 1880, the 10 hottest years on record have been in the past 17 years.
D. Antarctica lost about 36 cubic miles of ice between 2002 and 2005.
E. Since the beginning of the Industrial Revolution in the 1880s, the acidity of surface ocean waters has increased by about 30 percent.
F. The area covered by sea ice in the Arctic at the end of summer has shrunk by about 40% since 1979.
G. Currently, 37 glaciers in Glacier National Park are retreating.
H. Since 1990, data show that birds are beginning their northern migration earlier and earlier each year—particularly birds that migrate over shorter distances. They are having trouble finding their normal food sources at their destination.
I. The amount of heavy downpours has increased 74% in New England from 1958
to 2011.
Answers
Answer:
A. X
B. X
C. X
D. X
E. X
F. X
G. X
H. X
I. X
All of these statements can be considered signs of global warming. They provide evidence of changes in the Earth's climate that are consistent with the predictions of climate models and the understanding of the underlying physical processes.
Biotechnology: Genetic Modification Technologies
What are six ethical concerns that people have about genetic modification?
Answers
Answer:
Genetic Modification technology: It is a method that includes adding DNA into an organism's genome where the DNA is transferred into plant cell.
Explanation:
The ethical concerns are
1. SAFETY is the primary concern due to the likelihood of off-target consequences (edits in the wrong spot) and mosaicism (where some cells carry the edit but others do not).
2. INFORMED CONSENT
3. JUSTICE AND EQUITY
4. GENOME- EDITING RESEARCH INVOLVING EMBRYOS
5. POTENTIAL DAMAGE TO THE ENVIRONMENT
6. EXCESSIVE CORPORATE DOMINANCE
Learn more about the ethical concerns:
https://www.genome.gov/about-genomics/policy-issues/Genome-Editing/ethical-concerns
I am approximately 22 feet long, andam a part of your digestive system. I also help you absorb nutrients from the food you eat. What am I?
i need help i have been stuck on this for awhile qwq
Answers
solar energy from the sun drives the water cycle. Using the words in the diagram, explain how the sun drives the movement of water into the atmosphere and back down to earth.
Answers
precipitation
Explanation:
Solar energy grants high-quality quantities of electricity to Earth each day maximum of which is going to the sea which cowl 75% of the Earth the daylight heats up the water inflicting it to evaporate because the water this is now withinside the shape of a fuel line Rises to the top atmospheres and condensates as it's miles condensation it will become dense and begins off evolved to precipitate on a mountain or everywhere on Earth for that depend supposing the water this is now precipitate lands Mountain which comes down as a shape of Water via way of means of a river that flows down that.
The river water reaches the sea and it occurs again and again once more inflicting the water cycle to be powered via way of means of the solar electricity.
What is solar energy?Solar energy is the energy provided by the sun capable of producing heat and causing a chemical reaction.
Hence it concluded that solar energy from the sun drives the water cycle.
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How does the pacific ocean help explain the weather differences between San Francisco and Kansas city? If possible, discuss your answer.
Answers
The presence of pacific ocean causes weather differences between San Francisco and Kansas city.
The pacific ocean helps in explaining the weather differences between San Francisco and Kansas city because San Francisco is located near the pacific ocean which has great effect on its climate while on the other hand, Kansas city is located far from the pacific ocean which have less or no effect on the climate of the Kansas city.
San Francisco has hot, dry summers and cool, rainy winters due to presence near the pacific ocean whereas the climate of Kansas City has cold winters and hot summers with frequent thunderstorms so we can conclude that the presence of pacific ocean causes weather differences between San Francisco and Kansas city.
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I'LL GIVE BRAINLIEST:
Answers
It should be A and C.
What are 3 characteristics of bacteria?
Answers
Answer:
:')
Explanation:
lack of membrane-bound organelles, unicellular and small size.
Answer:
There are three notable common traits of bacteria, 1) lack of membrane-bound organelles, 2) unicellular and 3) small (usually microscopic) size. Not all prokaryotes are bacteria, some are archaea, which although they share common physicals features to bacteria, are ancestrally different from bacteria.
Why do animals not have photosynthesis?
A. animals have chloroplasts
B. animals do not have chloroplasts
C. animals have vacuoles
D. animals have cell walls
Answers
PART A: Which of the following best describes the central idea of the text?
Group of answer choices
People like buying experiences and products, but they gain more joy from the experiences that purchase than the products.
People gain more joy from buying experiences than buying products, but scientists have no explanation for why this happens.
People gain just as much joy from buying temporary experiences as they do from buying lasting products.
People feel negatively about buying products and positively about buying experiences.
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THE TAKING OF AIR RICH IN OXYGEN INTO THE BODY IS CALLED _
Answers
Answer:
Inhalation
Explanation:
hope its correct
Answer:
HELLO!!!
SO UR ANSWER IS...
Taking in of air rich in oxygen into the body is called INHALATION.
Thanks I hope it helps
True or False: The Calvin cycle is also known as the “light-dependent reaction” because it needs sunlight.
Answers
Answer:
false
Explanation: The Calvin Cycle, or light independent reaction, does not utilize sunlight as an input. During the light independent reaction, or the Calvin Cycle, carbon fixation first occurs. CO2 produced during the light dependent reaction reacts with RuBP, ultimately producing PGA.
Have a nice day!
the grasses that cover the prairies in America are disappearing. The soil is good and there is enough rain. What is MOST LIKELY causing the grass to disappear?
USATESTPREP!!!! IT IS AN ANSWER TO THAT MULTIPLE CHOICE ANSWER!!!!!!
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Answers
Answer: the scorching sun
Explanation: As the prairies are under the most sunny regions of America
Drag the labels to identify whether each image mainly shows mechanical weathering or chemical weathering. Each label can be used more than once.
Answers
We can see here that identifying whether each image mainly shows mechanical weathering or chemical weathering, we have:
Image 1: Chemical weathering.
Image 2: Mechanical weathering.
Image 3: Chemical weathering.
Image 4: Chemical weathering.
What is chemical weathering?The breakdown and alteration of rocks and minerals by chemical reactions with water, gases, and other elements in the environment is known as chemical weathering.
Both the creation of new minerals and the disintegration of old minerals into smaller particles are possible outcomes of chemical weathering.
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Biotechnology: Genetic Modification Technologies
What are three ways that genetic engineering is being used with animals? Give an example of each.
Answers
Genetic engineering is also employed to create disease-resistant animals. Scientists have developed genetically modified mosquitoes with altered genes that make them resistant to certain diseases like malaria or dengue fever. These modified mosquitoes can help control the spread of these diseases by reducing the mosquito population that carries and transmits them.
Genetic engineering is utilized to produce pharmaceutical products using animals. This process, known as biopharming, involves genetically modifying animals, such as goats or rabbits, to produce specific proteins or antibodies in their milk or eggs. These proteins can then be harvested and used for the production of therapeutic drugs, vaccines, or other medical treatments.
It's important to note that the field of genetic engineering is vast and constantly evolving, and there are various other applications and examples of genetic engineering in animals beyond the ones mentioned above.
Answer: Genetic engineering is being used with animals in various ways.
Explanation:
Disease Research and Biomedical Applications: Genetic engineering enables the creation of animal models with specific genetic modifications to study diseases and develop potential treatments. For instance, scientists have created genetically modified mice that carry mutations associated with human diseases like cancer or Alzheimer's.
Agricultural and Livestock Improvement: Genetic engineering is employed in agriculture to enhance traits in livestock and improve agricultural productivity. For example, researchers have developed genetically modified pigs that are more resistant to specific diseases, such as Porcine Reproductive and Respiratory Syndrome (PRRS).
Conservation and Species Preservation: Genetic engineering has the potential to contribute to conservation efforts and species preservation. One example is the use of assisted reproductive technologies, such as in vitro fertilization (IVF) and embryo transfer, to help save endangered species.
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HELP ME PLEASE WITH THIS
Answers
Answer:
Producer and consumer
Explanation:
Parasitism, symbiosis, mutualism, commensalism, and predation.
Explanation;
Each of these are relationships found in nature, including predation which was mentioned in the question. They all serve to represent different relationships and excluding symbiosis which acts as an umbrella term for some of the terms listed, they are all unique and mutually exclusive.
How many TOTAL atoms are in this compound?
H2C3O4N5
Answers
Answer:
14 atoms
Explanation:
answer pleaseeeee .................
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Answer:
The life of a red blood cell is one of repetition and of enrichment. We begin at the heart, as an un-enrichied blood cell, we travel through the ventricles and into the lungs, we travel along the lung sack and become enriched with oxygen, the arteries are slow and calm as the human is not moving too often, we travel to the legs where we enrich the muscles through the capillaries and enter the veins which will bring us back to the heart and continue the cycle again.
plz help me i need rn
Answers
Answer:
....C
Explanation:
Answer:
option d...hope it helps and don'ts copy in the test
A herbicide is a chemical that kills plants. Which best describes the effect of a herbicide being
applied to all of the plants in a food web?
A.All organisms would be affected
B.Only primary consumers would be affected.
C.Producers and decomposers would be the only populations affected.
D.Primary and secondary consumers would be affected, but tertiary consumers would not
Answers
Because plants are the producers and food source to herbivores which are food for carnivores.
Answer:
A. All organisms would be affected...
PLEASE HELPME OUT I WILL GIVE BRAINLIESTUOSDFODH
Answers
Answer:
Manta ray and trigger fish
Explanation:
Both of these are feeding on primary consumers, which are consuming plants (the producers).
What devices use radio waves?
Answers
Answer:
television and remote controlled stuff
Explanation:
Answer:
radios
television
cellular phones
walkie talkies
computers
radar
sonar
telescopes
satellites
missiles
rockets
Gravitropism is a coordinated process of differential growth by a plant in response to gravity pulling on it. It also occurs in fungi. Is this true?
OKAY SO IK THE ANSWER BUT NOW THAT ALL THE MODERATORS ARE GONE FREEEE POINNNNTSSSSSS!!!!!
Answers
Answer:
Gravitropism (also known as geotropism) is a coordinated process of differential growth by a plant in response to gravity pulling on it. It also occurs in fungi. Gravity can be either "artificial gravity" or natural gravity. It is a general feature of all higher and many lower plants as well as other organisms.
Explanation:
i totally didnt copy and paste your answer into the search bar or anything
Please help me with the image that I am going to attach! I am very confused
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Answer:
12
Explanation:
CAN I GET HELP PLEASE TYSM GET POINTS
Answers
Answer: The answer is Rockskipper and convict tang are omnivores.
Explanation:
Researching the dietary preferences of peacock flounders and other marine organisms can be achieved through a simple search or by seeking information on the eating habits of convict tangs, zooplankton, phytoplankton, and rock skippers. I have the pertinent information readily available for your perusal. Please, mark me brainiest.
Match the terms to the definition.
Question 1 options:
The idea of that the Earth and planets orbit the sun. A sun-centered view.
Huge clusters of stars, gas, and dust bound by the force of gravity.
A group of objects that orbit a star.
Jupiter, Saturn, Uranus, Neptune. Gas giants.
The spinning of a planet on its axis, causing day and night.
The orbit of a planet around the sun. On Earth, one year.
Mercury, Venus, Earth, Mars. Terrestrial, rocky.
A force of attraction that keeps planets orbiting the sun.
A rock that has entered Earth's atmosphere, leaving a streak of light in the night sky.
The theory the universe came forth from a single spot in an enormous explosion.
1.
Big Bang
2.
Doppler Effect
3.
Nebula
4.
Solar System
5.
Geocentric theory
6.
Heliocentric theory
7.
Gravity
8.
Galaxy
9.
Rotation
10.
Revolution
11.
Inner planets
12.
Outer planets
13.
Meteor
14.
Meteorite
15.
Meteoroid
Answers
1. Big Bang:- The theory the universe came forth from a single spot in an enormous explosion.
3. Nebula:- Huge clusters of stars, gas, and dust bound by the force of gravity.
4. Solar System:- A group of objects that orbit a star (Sun)
6. Heliocentric theory:- The idea that the Earth and planets orbit the sun. A sun-centered view.
7. Gravity:- A force of attraction that keeps planets orbiting the sun.
8. Galaxy:- Huge clusters of stars, gas, and dust bound by the force of gravity.
9. Rotation:- The spinning of a planet on its axis, causing day and night.
10. Revolution:- The orbit of a planet around the sun. On Earth, one year.
11. Inner planets:- Mercury, Venus, Earth, Mars. Terrestrial, rocky.
12. Outer planets:- Jupiter, Saturn, Uranus, Neptune. Gas giants.
13. Meteor:- A rock that has entered Earth's atmosphere, leaving a streak of light in the night sky.
For further information on such terms nad definitions,
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The solar system consists of many planets, moons, stars, asteroids, comets, and meteoroids, which itself is a part of the milky way galaxy. Beyond this are millions of galaxies that constitute the universe.
Big Bang is the theory the universe came forth from a single spot in an enormous explosion. Solar System is a group of objects that orbit a star. The heliocentric theory is the idea that the Earth and planets orbit the sun, a sun-centered view. Gravity is a force of attraction that keeps planets orbiting the sun.
Galaxy is a huge cluster of stars, gas, and dust bound by the force of gravity. Rotation is the spinning of a planet on its axis, causing day and night. Revolution is the orbit of a planet around the sun. On Earth, one year. The inner planets are Mercury, Venus, Earth, and Mars. Terrestrial and rocky. Outer planets are Jupiter, Saturn, Uranus, Neptune, and Gas giants.
Meteor is a rock that has entered Earth's atmosphere, leaving a streak of light in the night sky.
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Lol Answer This. Good Luck
Answers
Answer:
A
Explanation:
Message travels through the spinal cord
Answer:
D
Explanation:
Sorry if you get this wrong but I am pretty sure the message gets sent to the brain before you take action. So yeah.
⊙﹏⊙
Fill in the Blank: Different wavelengths of light have different ______
Answers
Answer:
energy levels.
Biotechnology: Genetic Modification Technologies
How is genome editing being used in agriculture, genetics research, and medicine? What is an advantage of its use in each area?
Answers
1. Agriculture: Genome editing is being used to develop crops that are more resistant to pests and diseases, have a longer shelf life, and are more nutritious. An advantage of using genome editing in agriculture is that it can be a more precise and efficient method of genetic modification compared to traditional breeding methods.
2. Genetics research: Genome editing is being used to study the function of genes and their role in various diseases. It can also be used to create animal models of human diseases, which can be used to test potential treatments. An advantage of using genome editing in genetics research is that it allows scientists to study the effects of specific genetic changes in a controlled environment.
3. Medicine: Genome editing is being used to develop new treatments for genetic diseases, such as sickle cell anemia and cystic fibrosis. It can also be used to modify immune cells to better target cancer cells. An advantage of using genome editing in medicine is that it has the potential to be a more targeted and precise method of treatment, which can lead to fewer side effects and better outcomes for patients.
Genome editing, is being applied across agriculture, genetics research, and medicine.
In agriculture, it allows modification of crop genomes to enhance yield, resistance to pests and diseases, and nutritional content, leading to increased food production and sustainability.
In genetics research, genome editing enables the study of gene function and disease mechanisms, accelerating the development of targeted therapies and advancements in medicines. In medicine, it offers the cure of genetic disorders by modifying disease-causing genes, previously untreatable conditions.
The advantage lies in improved crop productivity and sustainability in agriculture, accelerated genetic discoveries in research, and potential cures for genetic diseases, positively impacting global scientific understanding.
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Explain how scientist might use a Dichotomas key/chart
PLEASE DONT SOMETIHNG RANDOM I WILL REPORT IF YOU DO
Answers
Answer:
A scientist might use a dichotomous key to classify an organism.
Explanation:
Dichotomous keys are used to identify organisms based on their observable traits.
This is for a project at school
For those into the hobby of aquascaping what type of driftwood do you prefer?
A. Malaysian driftwood
B. Cholla wood
C. Mopani wood
D. Bogwood
Answers
Answer:
B or C they both look good
Explanation: