Chapter 5 - Cell Division

Question 1

If a diploid cell contains 50 chromosomes (2n=50), how many chromatids will be present at prophase II if it undergoes meiosis?

booster

Answer 1

50. Explanation: After meiosis I, there is a reductive division event where the resulting daughter cells are haploid. So there would be 25 chromosomes (haploid) and the sister chromatids are still attached. So there would still be 50 chromatids overall

Question 2

Which of the following cellular processes would lead to increased genetic diversity in a population of organisms?
A. Cell division via mitosis
B. Alternative splicing of gene transcripts
C. Synapsis of two homologous chromosomes
D. DNA synthesis during S phase of the cell cycle

booster

Answer 2

C. Synapsis of two homologous chromosomes

Question 3

What are the effects of an allosteric effector increasing the increasing the catalytic efficiency of an enzyme?
A. Kcat decreases, Km increases
B.  Kcat increases, Km decreases
C. Kcat decreases, Km remains unchanged
D. Kcat remains unchanged, Km increases 
E. Kcat increases, Km increases

Answer 3

B. Kcat increases, Km decreases

Question 4

Researchers are studying the last three phases of mitosis in actively dividing cancer cells. Different fluorescent probes are used to label various cellular components in these cells. Under the microscope, fluorescently labelled DNA appears blue, the nuclear envelope appears green, and the mitotic spindle appears red. Given this information, what stage of the cell cycle would the red fluorescence be most intense?
A. Anaphase only
B. Anaphase and metaphase
C. Telophase only
D. Metaphase only
E. Telophase and metaphase

Answer 4

B. Anaphase and metaphase

Question 5

Which of the following phases of meiosis can non-disjunction occur?
A. Prophase I
B. Cytokinesis
C. Metaphase II
D. Telophase I
E. Anaphase II

Answer 5

E. Anaphase II

Question 6

If a mutation occurs on a kinetochore, what phase of mitosis would be halted immediately?
A. Interphase
B. Prophase
C. Telophase
D. Metaphase
E. Cytokinesis

Answer 6

D. Metaphase