Biology 1406 - Chapter 12 | Attempts: 245

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| By Trueiopian

Trueiopian

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Quizzes Created: 1 | Total Attempts: 245

Questions: 14 | Attempts: 245 | Updated: Mar 20, 2023

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BIOLOGY 1406 CHAPTER 12.

Questions and Answers

1.

Starting with a fertilized egg, a series of five cell divisions would produce in early embryo with how many cells?
- A.
  
  4
- B.
  
  8
- C.
  
  16
- D.
  
  32
Correct Answer
D. 32

Explanation
Starting with a fertilized egg, each cell division doubles the number of cells. Therefore, after five cell divisions, there would be a total of 32 cells.

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1
0
2.

If there are 20 chromatids in a cell, how many centromeres are there?
- A.
  
  10
- B.
  
  20
- C.
  
  40
- D.
  
  5
Correct Answer
A. 10

Explanation
In a cell, each chromatid has one centromere. Since there are 20 chromatids, there must be 20 centromeres. Therefore, the correct answer is 20.

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3.

Chromosomes first become visible during which phase of mitosis?
- A.
  
  Metaphase
- B.
  
  Telophase
- C.
  
  Anaphase
- D.
  
  Prophase
Correct Answer
D. PropHase

Explanation
During prophase, the chromosomes condense and become visible under a microscope. This is because the chromatin fibers, which are loosely packed in interphase, start to coil and condense into tightly packed chromosomes. The nuclear envelope also begins to break down during prophase, allowing the chromosomes to be more easily observed. Therefore, prophase is the phase of mitosis when chromosomes first become visible.

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4.

Nerve and muscle cells are in _________ phase.
- A.
  
  G0
- B.
  
  G1
- C.
  
  S
- D.
  
  Mitotic
Correct Answer
A. G0

Explanation
Nerve and muscle cells are in the G0 phase. The G0 phase is a resting or non-dividing phase in the cell cycle where cells temporarily or permanently exit the cell cycle. In this phase, cells do not actively replicate their DNA or divide. Nerve and muscle cells, once they have reached their fully differentiated state, typically remain in the G0 phase and do not undergo further cell division. This allows them to perform their specialized functions without the need for continuous cell division.

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5.

Why do chromosomes coil during mitosis?
- A.
  
  To increase their potential energy.
- B.
  
  To allow chromosomes to move without becoming entangled and breaking
- C.
  
  To allow chromosomes to fit within the nuclear envelope
- D.
  
  To allow the sister chromatids to remain attached.
Correct Answer
B. To allow chromosomes to move without becoming entangled and breaking

Explanation
During mitosis, chromosomes coil to allow them to move without becoming entangled and breaking. This coiling helps to compact the DNA into a more condensed structure, making it easier for the chromosomes to separate and move to opposite ends of the cell. If the chromosomes were not coiled, they would be more likely to become tangled with each other, leading to potential breakage and errors in the distribution of genetic material. Coiling also helps to protect the DNA from damage during the process of cell division.

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6.

What are the purposes of mitotic cell division for multicellular organisms? List three
7.

What is the concept of genome?
8.

Define chromatin. How is it different from the concept of DNA?
9.

What is the difference between chromatin and chromosome in eukaryotic cells?
10.

Chromosome number is typically an odd number. True or False?
11.

In cell division, each DNA must be duplicated and each chromosome must be duplicated. True or False?
12.

What happens in cytokinesis? How is the cytokinesis in animal cells different from that in plant cells?
13.

What are mitotic spindles made up of? (chemical nature)
14.

Does mitotic cell division generate genetic diversity?

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Current Version
Mar 20, 2023

Quiz Edited by
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Dec 05, 2009

Quiz Created by
Trueiopian

Biology 1406 - Chapter 12

Starting with a fertilized egg, a series of five cell divisions would produce in early embryo with how many cells?

If there are 20 chromatids in a cell, how many centromeres are there?

Chromosomes first become visible during which phase of mitosis?

Nerve and muscle cells are in _________ phase.

Why do chromosomes coil during mitosis?

What are the purposes of mitotic cell division for multicellular organisms? List three

What is the concept of genome?

Define chromatin. How is it different from the concept of DNA?

What is the difference between chromatin and chromosome in eukaryotic cells?

Chromosome number is typically an odd number. True or False?

In cell division, each DNA must be duplicated and each chromosome must be duplicated. True or False?

What happens in cytokinesis? How is the cytokinesis in animal cells different from that in plant cells?

What are mitotic spindles made up of? (chemical nature)

Does mitotic cell division generate genetic diversity?