Essay on Study Guide

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Words: 1583
Pages: 7
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Mock 3rd Exam
Chapters: 8-12
Dates of Dr. Njus’ Slides: 10/18-11/8
1. During the last checkpoint, a cell is checking whether
a. The DNA is damaged
b. Two chromosomes are present
c. Sister chromatids have been produced
d. Chromosomes are aligned at the metaphase plate
2. During which phase of mitosis would you expect to see chromosomes consisting of two sister chromatids within the nucleus?
a. Metaphase
b. Anaphase
c. Prophase
d. Prometatphase
3. If a parent cell has fourteen chromosomes prior to S phase, how many chromosomes and sister chromatids will it have at the end of this phase?
a. 14 and 28
b. 28 and 56
c. 7 and 14
d. 14 and 14
4. At which stage of mitosis are chromosomes photographed in the preparation of a karyotype?
a. S phase
b. Late telophase
c. Prophase
d. G1 phase
5. Sister chromatids of each chromosome move apart due to the breaking of ______________ and end up at opposite poles of the cell during ____________
a. Synaptonemal complex . . . anaphase II
b. Synaptonemal complex . . . anaphase I
c. Cohesins . . . anaphase I
d. Cohesins . . . anaphase II
6. Which one of the following is found in meiosis but NOT found in mitosis?
a. Separation of sister chromatids
b. A spindle consisting of microtubules
c. Cell division
d. Paired homologous chromosomes
7. In humans, pointed eyebrows (B) are dominant over smooth eyebrows (b). Mary’s father has pointed eyebrows, but she and her mother have smooth. What is the genotype of the father?
a. bb
b. Bb
c. BB
d. B and C
8. What does chromatin consist of?
a. RNA and phospholipids
b. Steroids and protiens
c. DNA and Protein
d. Protein and carbohydrates
9. Which statement about the daughter cells of mitosis is correct?
a. They are genetically identical to one another but different from the parent cell
b. They differ genetically from one another and the parent cells
c. They are genetically identical to one another and to the parent cells
d. One of the daughter cell is genetically identical to the parent cell
10. All of the following might describe the events occurring in prophase I EXCEPT:
a. Separation of homologous chromosomes
b. Tetrad formation
c. Crossing over
d. Formation of spindle apparatus
11. The chromosomes in one gamete have a different combination of alleles than chromosomes in another gamete due to crossing over and independent assortment of tetrads during prophase I.
a. True
b. False
12. Cytokinesis
a. Is mitosis in plants
b. Requires the formation of a cell plate in plant cells
c. Is division of cytoplasm in animals
d. B and C
13. Meiosis is a division mechanism that produces
a. Four nuclei
b. Two cells
c. Four cells
d. Two nuceli
e. A and C
14. How can one differentiate between a homozygous dominant individual and one who is heterozygous for the dominant trait?
a. By crossing each individual in question with a homozygous dominant and examining the offspring
b. By crossing each individual in question with a homozygous recessive and examining the offspring
c. By crossing the individuals in question with each other
d. None of the above is correct
15. What is needed to pass the G2/M checkpoint of the cell cycle
a. Cdk1/Cyclin B
b. Cdk2/Cyclin E
c. Cdk4/Cyclin D
d. Cdk1/Cyclin E
16. Inositol phosphates (IP3) opens ion channels in the membrane of the smooth endoplasmic reticulum, releasing a flood Ca+2 ions into the cytoplasm.
a. True
b. False
17. Which of the following characterize telophase?
a. Formation of the spindle apparatus
b. Reformation of nuclear envelope
c. Decondensation of chromosomes
d. Separation of sister chromatids
e. B and C
18. If a female was a carrier for X-linked recessive trait, what percentage of her male children would also have this trait?
a. 0%
b. 25%
c. 100%
d. 50%
19. Which is the correct sequence of steps leading to the formation of tightly packaged chromosomes?
a. Rosettes, chromatin loops, solenoids, nucleosomes
b. Chromatin loops,
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