Answer:
Prophase I
Explanation:
During prophase I, homologous chromosomes pair up and exchange sections of DNA.
During prophase I, the homologous chromosome pairs independently align themselves at the equator of the cell.
What happens in prophase I?DNA replication precedes the start of meiosis I. During prophase I, homologous chromosomes pair and form synapses, a step unique to meiosis. The paired chromosomes are called bivalents, and the formation of chiasmata caused by genetic recombination becomes apparent.
Moreover, during prophase I, the complex of DNA and protein known as chromatin condenses to form chromosomes. The pairs of replicated chromosomes are known as sister chromatids, and they remain joined at a central point called the centromere.
Therefore, during prophase, the chromosomes in a cell's nucleus condense to the point that they can be viewed using a light microscope. Prophase is the first phase of mitosis. During this phase, the chromosomes inside the cell's nucleus condense and form tight structures.
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In what way is an ecosystem different from than an organism, population, and a community?
Answer:
Ecosystems are made up of all the different living organisms as well as the abiotic elements that affect them. In ecology, the difference between community and ecosystem is that the community refers only to living organisms inside an ecosystem.
Explanation:
Which population would benefit the most from the presence of decomposers
Answer:
population live in agricultural activities
Explanation:
decomposers recycles nutrients for soil so can plant also use it
How did the genus homo adapt to accommodate the obstetric dilemma?.
The genus homo adapted to accommodate the obstetric dilemma through the following:
Birth development where the head of the baby rotates.Assistance during labor.What is Obstetrics?This is the branch of medicine which deals with pregnancy, childbirth and the postpartum period.
The genus homo adjusted to obstetrics dilemma by ensuring assistance during labor to ensure safe delivery of the babies by the females.
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Does a kangaroo in hibernate, estivate, or migrate in cold weather?
Answer:
They hibernate in winter and usually breed in spring.
Explanation:
In an experiment investigating the time needed to kill a certain type of bacteria at 100°, which of the following variables need to be controlled?
time only
temperature and type of bacteria only
temperature only
time and temperature only
Baed on the nature if the investigation, the temperature and type of bacteria need to be controlled in this experiment.
What are variables in an experiment?Variables are quantities whose values determine the result or can affect an experiment.
Variables may either be:
dependent variableindependent variable constant variableSince the experiment is investigating the time needed to kill a certain type of bacteria at 100°, the temperature and type of bacteria need to be controlled.
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Clostridium tetani is a bacterium that can be found in soil.
It causes the infection tetanus.
Chrildren are vaccinated against tetanus.
Explain why these children do not get tetanus if the bacteria enters their body through a cut in the skin.
Explanation:
because vaccine injected to them produces antibodies which fight against the bacteria
In proteins structure determine the what? of a protein
The primary structure of a protein is its amino acid sequence. This drives the folding and bonding of the linear amino acid chain, which in turn determines the unique three-dimensional shape of the protein.
I hope this helps you
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Name two ways that a cell would be harmed if the cell membrane were damaged.
Answer:
Damaging the cell membrane like to impact the functions of the cell because cell membrane acts as a semi-permeable membrane which allows the entry and exit of some materials in and out of the cell. If the cell membrane get damaged then the cell wall allows every molecule to enter or leave the cell without selecting the molecules. Thus, the functional properties of the cell will lost and the cell will die.
How is preimplantation genetic diagnosis used in the future?
Please help
Thank you
Answer:
In recent years PGD technology has been increasingly used by infertile patients undergoing IVF treatment, in order to screen their embryos for chromosomal abnormalities. Aneuploidy is extremely common in human embryos and leads to a developmental arrest, implantation failure and spontaneous abortion.
What important role does water play in the function that needs to be performed by the kidneys
Answer:
Water helps the kidneys remove waste from your blood through urine. Water also helps keep blood vessels open, which lets blood flow through easier, letting the blood remove its waste through the kidney more efficiently.
Explanation:
Answer:
It helps in Osmoregulation and removal of excess liquid from the body.
Explanation:
It regulates fluid balance by excreting excess amount of water as urine while retaining the necessary amount of water in the body that is essential for living.
Osmoregulation - the process of maintaining salt and water/osmotic balance across membranes within the body.
The fluids inside and surrounding cells are composed of water, electrolytes, and non-electrolytes.
What are the horticultural advantages of producing plants by cuttings rather than from seeds? Can you think of any disadvantages?
Answer:
Propagating a plant by cuttings will allow you to keep the special characteristics of that plant. Plants grown from seed will often be different from the parent plant and from each other. Propagating a new plant via cuttings avoids the difficulties of propagating by seed.
Which is a correct observation based on the photo shown below?
A bird with green, yellow, black, and white feathers is shown. It has a long narrow beak that is longer than the length of its head.
The bird’s coloring indicates that it lives in trees with green and yellow leaves.
The bird has a narrow beak that is longer than the length of its head.
The bird probably uses its long beak to reach the nectar inside flowers.
The bird must inhabit a cold climate since there is ice on the branches.
Answer:
The bird has a narrow beak that is longer than the length of its head.
Explanation:
-The beak is long and thin, which helps it dip into the flowers to sip nectar (a sugary fluid the hummingbird uses for food).
-This bird (Hummingbird) have a long, narrow beak that allows it to reach the nectar from brightly colored, tubular flowers. It also feeds on insects and have a flexible lower beak that allows them to grab insects from the air during flight.
hope that helps :)
Answer:
The bird has a narrow beak that is longer than the length of its head
Explanation:
-The beak is long and thin, which helps it dip into the flowers to sip nectar (a sugary fluid the hummingbird uses for food).
-This bird (Hummingbird) have a long, narrow beak that allows it to reach the nectar from brightly colored, tubular flowers. It also feeds on insects and have a flexible lower beak that allows them to grab insects from the air during flight.
hope that helps :)
Describe the roles of the national and state governments in the amendment process?
Answer:
only three-fourth of states legislatures need to pass an amndment to the constitution
Inadequate blood flow to the heart muscle can cause an area of damaged cardiac tissue known as a(n) .
A myocardial infarction comprises a series of changes in the cardiac tissue that originate when there is an inadequate blood flow to the heart muscle or a coronary artery becomes blocked.
What is a myocardial infarction?It is characterized by the sudden appearance of a picture of ischemic suffering (lack of irrigation) to a part of the heart muscle produced by the acute and total obstruction of one of the coronary arteries.
It is recognized by the sudden appearance of the characteristic symptoms of intense pain in the chest, in the precordial area and a feeling of general malaise.
Therefore, we can conclude that a myocardial infarction comprises a series of changes in the cardiac tissue that originate when there is an inadequate blood flow to the heart muscle.
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8. Choose the best answer. Polar bears have adaptations for swimming long distances. Where is this adaptation found?
O phenotype
O genetic code in RNA
O genetic code in DNA
O genotype
Answer:
a
Explanation:
a is phenotype
Answer:
i think its phenotype
Explanation:
-phenotype is the set of observable characteristics or traits of an organism
Describe the importance of the nucleus membrane being part of the endoplasmic
reticulum and the Golgi apparatus' membranes
Answer: Nucleus membrane isn't part of the ER or Golgi Apparatus, BUT all of them are part of the endomembrane system.
Endoplasmic reticulum and Golgi apparatus are two membrane-bound organelles found in eukaryotes. Both these organelles are closely associated and functionally related. Both endoplasmic reticulum (ER) and Golgi apparatus are two components of the endomembrane system of a cell. Lysosomes and vesicals are the other components of the endomembrane system.
what do you think are the odds of getting four tails in a row? Explain your answer.
Answer:
It depends on how many flips you do.
Explanation:
None.
Explain the difference between a lateral moraine and a terminal moraine.
Answer:
Terminal moraines are found at the terminus or the furthest (end) point reached by a glacier. Lateral moraines are found deposited along the sides of the glacier. Medial moraines are found at the junction between two glaciers.
Is NaCI a diatomic element
Answer:
Yes.
Explanation:
HCl, NaCl, and KBr are all examples of diatomic elements.
How many bivalents are formed in a cell with 20 chromosomes at the beginning of meiosis i?.
In what ways do viruses differ from other pathogens?.
Viruses differ from other pathogens because they are considered non-living.
What are viruses?Viruses are organisms that are incapable of reproducing on their own without a living host.
Viruses cannot undergo any of the characteristics of life outside a living host.
They, therefore, infect their host and use the mechanisms of the host to replicate themselves.
Therefore, viruses differ from other pathogens because they are considered non-living.
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Which choice best describes a plant cell? A cell that uses sugars.
B cell that has a nucleus.
C cell that has a cell wall.
D A cell that has a cell membrane.
Answer: C
Explanation:
Vitamin D regulates Multiple Choice blood calcium levels. Fluid balance. Oxidation and reduction reactions. Energy metabolism
Vitamin D help to regulate blood calcium levels.
What is Vitamin D?Vitamin D is a group of fat-soluble secosteroids responsible for increasing intestinal absorption of calcium, magnesium, and phosphate, and many other biological effects. In humans, the most important compounds in this group are vitamin D₃ and vitamin D₂. .
It help to absorb calcium and potassium in the body.
Therefore, Vitamin D help to regulate blood calcium levels
Which interest group opposed the U.S. Clean Water Act?
A) citizens of small towns that lacked water treatment facilities
B) mayors of large cities such as New York and Chicago
C) duck hunters
D) owners of printing companies in Tennessee
None of the interest groups mentioned opposed the U.S. Clean Water Act. In fact, the Clean Water Act was passed with broad support from a variety of stakeholders, including environmental groups, industry, and government agencies.
What is the Clean Water Act?The Clean Water Act (CWA) is a federal law enacted in 1972 with the aim of regulating and protecting the nation's waters from pollution and contamination. The CWA established a framework for controlling and limiting the discharge of pollutants into navigable waters, including rivers, lakes, and coastal areas, and set water quality standards to ensure that waters are safe for human use and aquatic life.
The Act provides a regulatory framework for permitting discharges of pollutants, sets water quality standards for contaminants, and establishes a program for regulating the discharge of pollutants from stormwater runoff. The CWA has been amended several times to strengthen its provisions, and it remains a critical tool for protecting water resources and public health in the United States.
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What would happen if there were no predators in the forest? Would the colors of the moths change over time?
An antigen has invaded a mammal's body. Specific immune cells engulf and ingest it. Some of the digested pieces are displayed on the cells' bodies. What happens next?
Answer:
The correct answer is A- B cells are activated and release antibodies
Explanation:
When an antigen invades a mammals body, specific immune cells engulf and ingest it. Some of the digested pieces are displayed on the cells bodies, the next step will be that B cells are activated and release antibodies.
Which of the following explains Mendel's principle of segregation?
A. During meiosis, gametes are produced with only one copy of each gene.
B. Heterozygous organisms always breed true for a given trait.
C. Genes that are close to each other on a chromosome are often inherited together.
D. An organism must receive only one copy of a recessive gene to show the recessive trait.
Answer:
C. Genes that are close to each other on a chromosome are often inherited together.
Could the world's
Cavendish banana crop be
destroyed some day?
Construct an explanation to
support your answer. Base
the explanation on evidence
from the potato famine.
Cavendish banana crop be destroyed some day due to Panama disease.
How Cavendish banana crop be destroyed?The Cavendish banana is considered as the most popular banana worldwide but it could disappear in the coming years because of the attack of an aggressive fungus called "Panama Disease."
This disease destroy the banana plant at faster rate which leads to its destruction so we can conclude that Cavendish banana crop be destroyed some day due to Panama disease.
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How can you relate the structures
to those of bryophytes in terms of evolutionary trend
Answer:
Because ferns and fern allies posses true vascular tissues, they can grow to be much larger and thicker than the bryophytes.
Bryophytes mark the transition to land and the origin of vascular plants, and hence, link the seed and vascular plants to their algal ancestors.
Molecular phylogenetic studies conclude that bryophytes are the earliest diverging lineages of the extant land plants. They provide insights into the migration of plants from aquatic environments to land.What is evolution trends?Evolutionary trends, whether macro evolutionary events across higher taxa and large spans of geologic time, or more circumscribed events within smaller clades, have long played a prominent role in evolutionary theory.
The identification of trends in the history of life has been used as evidence for the increasing adaptions of life, for evolutionary progress, and more recently as support for selection at multiple levels.To know more about evolution here
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What is the Liquid part of blood called?
Answer:
The liquid portion of the blood is called plasma.
Explanation:
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