BIOLOGY HIGH SCHOOL

Why are chromosomes visible during mitosis but not at all other times?

Answers

Answer 1
Answer:  Chromosomes are visible at any time but are most easily seen through a simple microscope when they meet at the plate during the metaphase stage of mitosis because the chromosomes are jumbled together and then form the traditional X-shape. 

They are easy to see because a single strand of DNA from H. sapiens is about 6 feet long! 

Good luck on that test of your and i hope you past the test

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The genetic material contained in the nucleus of each of the new cells is most likely?
Which two of these characteristics does an organism with bilateral symmetry possess?lack of tissue symmetrical in many ways across a central axispresence of a head development from three cell layers
Students are each given a 20 gram sample of an unknown solid compound in a clear plastic bag. They are instructed to break the material into smaller parts by gently hitting it with a hammer. Some of the parts break into large chunks and some look like a fine powder. Which statement correctly describes these broken pieces of the sample? The pieces of fine powder are individual atoms The larger pieces are still compounds and the smaller pieces are elements. Each piece contains the same number of atoms. Each piece contains the same proportion of different elements.

What determines the rate of nutrients and waste are exchanged from the cell and the environment?A. Surface Ratio
B. Milliliters
C. Surface Area to Volume Ratio
D. Volume

Answers

The rate of nutrients and waste are exchanged from the cell and the environment depends on surface area to volume ratio.

What is a surface area to volume ratio?

The amount of square meters of surface area per unit volume is known as surface area to volume ratio.

What is the relationship between surface area to volume ratio and size of the cell?

The surface area to volume ratio becomes smaller as the size of a cell increases.

What is the relationship between surface area to volume ratio and exchange of materials?

The exchange takes more time when the surface area to volume ratio is small.

To learn more about cell, surface area to volume ratio and exchange here,

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Answer:

C.

Explanation:

Volume, no

Milliliters , no

Surface Ratio, come on

An egg is protected by its outer shell. However, the shell also allows moisture and air to pass through. Which cell structure performs a similar function?A:cell membrane
B:cytoplasm
C:nucleus
D:vacuole

Answers

Answer:

Cell membrane.

Explanation:

The cell is the basic unit of the living organisms. The cell consists of the various cell organelles like nucleus, mitochondria and Golgi. The cell membrane covers the cell boundary.

The outer shell protects the egg and allows the exchange of moisture. The plasma membrane performs the similar functions ad allows the transport of some selected particles only.

Thus, the correct answer is option (A).
A:cell membrane, is right

In a scientific investigation, what is the name for a prediction that can be tested?conclusion
evidence
hypothesis
verification

Answers

The answer is hypothesis
Hypothesis i think. Hope this helped

Scientists today can use many experimental methods to study evolution. Which method was developed after Darwin’s time?DNA comparisonsobservationsfossilsexperimentation

Answers

DNA comparisons was developed after Darwin's time and have become an important method for studying evolution.

While Darwin was able to make observations of variation and adaptation in different species, he did not have access to the genetic information that DNA provides. It wasn't until the discovery of the structure of DNA in 1953 that scientists began to explore the use of DNA in studying evolution.

Since then, DNA sequencing and comparisons have become increasingly important tools in the study of evolutionary relationships and processes.

In science, DNA comparison is a ground-breaking technology. It has given researchers the ability to compare and contrast DNA samples with previously unheard-of accuracy.

Researchers can learn a great deal about genetic links and diseases as well as create brand-new remedies for illnesses by examining these traits.

To learn more about Evolution, visit:

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Darwin hypothesized that new species could appear gradually through small changes in an ancestral species.what experiment did he conduct to test this hypothesis?

Answers

Answer;
He conducted an experiment with breeding pigeons. 

Explanation;
The pigeons provided the perfect animal to test his theory of selection for quite a number of reasons including its trait diversity from wing structures to color patterns to size to flight patterns. From these experiments he concluded that by natural selection of randomly occurring traits that make species better suited for survival and reproduction, evolve in the astounding diversity of organisms on Earth today. 

Answer:

I think that the answer is B

Mitosis and meiosis are methods of cell division. Which of the following is true of these two methods? A. Meiosis involves only one division, while mitosis involves two divisions. B. Mitosis involves two or more divisions, while meiosis involves exactly two divisions. C. Meiosis involves two or more divisions, while mitosis involves exactly two divisions. D. Mitosis involves only one division, while meiosis involves two divisions.

Answers

Answer:

D. Mitosis involves only one division, while meiosis involves two divisions.

Explanation:

Mitosis and meiosis are processes of cell reproduction that happen in living beings. They originate cells for different purposes. Each mitosis produces two cells equal to the source. An meiosis creates four daughter cells with half the genetic material of the mother cell.
D. Mitosis involves only one division, while meiosis involves two divisions.


Mitosis --> Two identical diploid daughter cells from one division

Meiosis --> Four unique haploid daughter cells from two divisions
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Which plant system is affected when the xylem tissue is removed?a. Transport of water and minerals from the roots to the shoot system b. Transport of sugars from the leaves to the shoot system c. Transport of minerals from the leaves to the reproductive parts
Bacteria that use sunlight as an energy source are consideredO A) photoautotrophsO B) ertrophsO C) aprobesO D) chemoautotrophs
The phase of cell division in which chromosomes align on the spindle equator halfway between the spindle poles is A. prophase.B. telophase.C. anaphase.D. metaphase.
Which statement describes natural selection? It is the primary mechanism for evolution. It must act on structural traits. It acts to cause overpopulation. It causes learned skills to become heritable traits.