Question 1

The structure labeled "c" in the following figure is called the 
A) centromere.
B) centriole.
C) sister chromatid.
D) spindle.
E) non-sister chromatid.

Accepted Answer

The centromere is the area of a chromosome where the sister chromatids are held together and is typically located near the center of the chromosome. The structure labeled "c" appears to be the centromere based on its location and the fact that it is connecting the two sister chromatids.

Question 2

The figure below shows a cell in the mitotic stage of 
A) anaphase.
B) interphase.
C) metaphase.
D) prophase.
E) telophase.

Accepted Answer

In metaphase, the chromosomes are aligned along the equatorial plane of the cell and appear condensed and visible under the microscope. This is exactly what is observed in the image, where the chromosomes form a linear array at the center of the cell. The spindle fibers are also visible, attaching to the kinetochores of each chromosome. Therefore, the best choice is C) metaphase.

Question 3

When during the cell cycle are chromosomes visible? A) only during interphase B) only when they are being copied C) during Mitosis D) only during the G₁ phase E) Chromosomes are always visible

Accepted Answer

Chromosomes are visible during mitosis, when they are condensed and aligned along the equator of the cell for segregation to daughter cells. They are not visible during interphase, when they exist as loosely packed chromatin fibers, or during S phase, when they are being duplicated. Option D appears to be a made-up phase and option E is incorrect, as chromosomes are not always visible.

Question 4

A cell is inhibited during the S phase of its cycle.It will not reproduce due to lack of
A) ATP availability.
B) centriole migration.
C) centromere formation.
D) DNA synthesis.
E) plasma membrane structure.

Accepted Answer

During the S phase, the cell replicates its DNA. If a cell is inhibited during this phase, it will not be able to complete this important step in the cell cycle, and thus will not be able to reproduce.

Question 5

Which of the following organelles would be abundant and in close proximity to the cell plate in a plant cell undergoing cytokinesis?
A) centrioles
B) Golgi apparatus
C) rough endoplasmic reticulum
D) lysosomes
E) central vacuole

Accepted Answer

The Golgi apparatus plays a key role in cytokinesis in plant cells by distributing vesicles carrying cell wall and membrane components to the site of the cell plate formation. Therefore, it would be abundant and in close proximity to the cell plate during cytokinesis in a plant cell.

Question 6

The figure below shows a cell in the mitotic stage of 
A) anaphase.
B) interphase.
C) metaphase.
D) prophase.
E) telophase.

Accepted Answer

The answer of The figure below shows a cell in...

Question 7

Refer to the figure below.Differentiated cells,such as nerve cells,would be in which of the following stages of the cell cycle? 
A) a
B) b
C) c
D) d
E) e

Accepted Answer

Differentiated cells, such as nerve cells, have exited the cell cycle and are in G0 phase, which is represented by stage b in the figure. This stage is characterized by the cell not actively dividing or preparing for division.

Question 8

The G₂ checkpoint prevents the cell cycle from continuing until A) DNA is completely replicated. B) damage to DNA can be repaired. C) replicated DNA is separated. D) organelles have been duplicated. E) DNA is completely replicated AND damage to DNA can be repaired.

Accepted Answer

The G₂ checkpoint is also known as the G1/S checkpoint, which occurs at the end of the G1 phase before the cell enters the S phase. This checkpoint ensures that the cell has properly replicated its DNA and that any damage to the DNA has been repaired before entering the S phase. Therefore, both choices A and B are correct, and the best answer is E. Choices C and D are not correct because the completion of DNA replication and organelle duplication occur later in the cell cycle during the S phase and G2 phase, respectively.

Question 9

Susan was examining a cell under the microscope and noticed the formation of a cell plate in the midline of the cell and the formation of nuclei at opposite poles of the cell.The cell under examination was most likely a(n)
A) animal cell in the M phase of the cell cycle.
B) dividing bacterial cell.
C) plant cell undergoing cytokinesis.
D) animal cell undergoing cytokinesis.
E) plant cell in the anaphase stage.

Accepted Answer

The formation of a cell plate indicates that the cell is undergoing cytokinesis, which only occurs in plant cells because they have a cell wall that needs to be divided. Additionally, the formation of nuclei at opposite poles also aligns with plant cell division, as plant cells have a unique process of forming new nuclei before the cell wall fully divides. Therefore, the cell under examination is most likely a plant cell undergoing cytokinesis.

Question 10

Which of the following statements is correct regarding the events of the cell cycle? A) DNA is duplicated during the G₁ and G₂ phases. B) DNA replicates during cytokinesis. C) The M phase is usually the longest phase. D) Interphase consists of G₁, S, and G_2. E) The cell stops growing in G₂ phase.

Accepted Answer

Interphase consists of three stages: G₁, S, and G₂. During G₁, the cell grows and synthesizes RNA and proteins, and during G₂, it continues to grow and prepare for DNA replication. The S phase is when DNA replication actually occurs.

Question 11

Nuclear division is represented in the figure below by the letter 
A) a.
B) b.
C) c.
D) d.
E) e.

Accepted Answer

The answer of Nuclear division is represented in the figure...

Question 12

The figure below shows a cell in the mitotic stage of 
A) anaphase.
B) interphase.
C) metaphase.
D) prophase.
E) telophase.

Accepted Answer

The answer of The figure below shows a cell in...

Question 13

DNA and histones form beadlike globules known as
A) nucleotides.
B) the chromatin network.
C) centrosomes.
D) nucleosomes.
E) mesosomes.

Accepted Answer

DNA and histones combine to form nucleosomes, which appear as beadlike globules under a microscope.

Question 14

Which following pair is correctly matched? A) G₁ phase - DNA replication B) G₂ phase - preparation for meiosis C) S phase - DNA replication D) M phase - cell growth E) G₀ phases - cell growth

Accepted Answer

The S phase, also known as the synthesis phase, is the part of the cell cycle where DNA is replicated. Thus, option C is correctly matched. None of the other options are correctly matched. Option A appears to be a made-up acronym, and there is no known phase called the G₁ phase. Option B is also incorrect as meiosis is a specialized type of cell division that involves multiple phases, and there is no specific phase known as the G₂ phase. Option D is incorrect, as the M phase, or mitosis, is the part of the cell cycle where the cell divides, and it does not involve cell growth. Option E is also incorrect, as G₀ phases is not a known term used to describe any part of the cell cycle.

Question 15

Which of the following represents the phases of mitosis in their proper sequence?
A) prophase, metaphase, anaphase, telophase
B) interphase, prophase, metaphase, telophase
C) anaphase, interphase, prophase, metaphase, telophase
D) prophase, metaphase, anaphase, telophase, cytokinesis
E) metaphase, interphase, cytokinesis, anaphase, telophase

Accepted Answer

The correct sequence of the phases of mitosis is prophase, metaphase, anaphase, and telophase, in that order. Option B is incorrect because interphase is not a phase of mitosis, it's the phase before mitosis where DNA is replicated. Option C is incorrect because anaphase comes after metaphase, and interphase is not a phase of mitosis. Option D is incorrect because cytokinesis is not a phase of mitosis, it's a separate process that occurs after telophase. Option E is incorrect because interphase and cytokinesis are not phases of mitosis.

Question 16

While Jeff was looking under the microscope at cells in different stages of mitosis he commented on the fact that many cells were in the same stage.If you were looking under the compound light microscope at an onion root tip,what stage would the majority of the cells be in the cell cycle?
A) anaphase
B) metaphase
C) cytokinesis
D) interphase
E) prophase

Accepted Answer

The majority of cells in the onion root tip would be in interphase, as this is the longest stage of the cell cycle and cells spend most of their time in this stage preparing for the phases of mitosis.

Question 17

A mutation results in a cell that no longer produces a normal protein kinase for the M-phase checkpoint.Which of the following would likely be the immediate result of this mutation? A) The cell would prematurely enter anaphase. B) The cell would never leave metaphase. C) The cell would never enter metaphase. D) The cell would never enter prophase. E) The cell would undergo normal mitosis, but fail to enter the next G₁.

Accepted Answer

An M-phase checkpoint also occurs during mitosis when division pauses until the chromosomes are properly attached to the spindle, ensuring that chromosomes will be distributed to the daughter cells accurately.

Question 18

The structures labeled "d" in the following figure are called 
A) centromeres.
B) centrioles.
C) sister chromatids.
D) spindles.
E) non-sister chromatids.

Accepted Answer

The answer of The structures labeled "d" in the following...

Question 19

Ben was looking at onion root tip cells under the microscope in Biology class.He saw one cell that had two nuclei within it.What stage of the cell cycle was this cell in?
A) anaphase
B) interphase
C) metaphase
D) prophase
E) telophase/cytokinesis

Accepted Answer

The presence of two nuclei within one cell indicates that the cell has gone through mitosis and cytokinesis has started or is about to start. Therefore, the cell is in telophase/cytokinesis.

Question 20

All of the following statements are true about mitosis except
A) the cells arising from the process are genetically alike.
B) the process of mitosis is followed by cytokinesis.
C) spindle fibers are involved in the movement of chromosomes.
D) both sexually and asexually reproducing organisms utilize the process of mitosis.
E) the cells arising from the process contain only half of the necessary genetic material.

Accepted Answer

The statement "the cells arising from the process contain only half of the necessary genetic material" is not true for mitosis. Mitosis is a process of cell division where the daughter cells formed are genetically identical to the parent cell and contain the same amount of genetic material. This statement is more applicable to meiosis, which is a specialized form of cell division that produces gametes with half the normal number of chromosomes.

Quiz 8: Cellular Reproduction

The structure labeled "c" in the following figure is called the

The figure below shows a cell in the mitotic stage of

When during the cell cycle are chromosomes visible?

A cell is inhibited during the S phase of its cycle.It will not reproduce due to lack of

Which of the following organelles would be abundant and in close proximity to the cell plate in a plant cell undergoing cytokinesis?

The figure below shows a cell in the mitotic stage of

Refer to the figure below.Differentiated cells,such as nerve cells,would be in which of the following stages of the cell cycle?

The G2 checkpoint prevents the cell cycle from continuing until

Susan was examining a cell under the microscope and noticed the formation of a cell plate in the midline of the cell and the formation of nuclei at opposite poles of the cell.The cell under examination was most likely a(n)

Which of the following statements is correct regarding the events of the cell cycle?

Nuclear division is represented in the figure below by the letter

The figure below shows a cell in the mitotic stage of

DNA and histones form beadlike globules known as

Which following pair is correctly matched?

Which of the following represents the phases of mitosis in their proper sequence?

While Jeff was looking under the microscope at cells in different stages of mitosis he commented on the fact that many cells were in the same stage.If you were looking under the compound light microscope at an onion root tip,what stage would the majority of the cells be in the cell cycle?

A mutation results in a cell that no longer produces a normal protein kinase for the M-phase checkpoint.Which of the following would likely be the immediate result of this mutation?

The structures labeled "d" in the following figure are called

Ben was looking at onion root tip cells under the microscope in Biology class.He saw one cell that had two nuclei within it.What stage of the cell cycle was this cell in?

All of the following statements are true about mitosis except

The G₂ checkpoint prevents the cell cycle from continuing until