BIS 101 Study Guide - Final Guide: Gene Expression, Video Lesson, Apoptosis
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Question 10
A microscope image of a cell in interphase is treated with dyes to stain the nucleic acids (DNA and RNA). This image probably displays ______.
visible nucleoli | ||
separate visible chromosomes | ||
visible spindle fibers |
1 points
Question 11
To observe plant cells undergoing mitosis, the best plant tissue to isolate would be ______.
a section of the root tip | ||
a section of the mature fruit | ||
a section of the main stem |
1 points
Question 12
Owen observes a slide containing whitefish blastula sections. He finds a cell with visible spindle lines extending from two points on opposite sides of the cell and chromosomes as small black Xs halfway between the two poles. What stage of the cell cycle is Owen observing?
anaphase | ||
metaphase | ||
prometaphase |
1 points
Question 13
What structural feature can you use to distinguish between DNA-stained onion cells in anaphase and telophase?
Sister chromatids separate as anaphase ends and telophase begins. | ||
The vesicles forming a cell plate appear around the onset of telophase. | ||
The chromosomes are clustered at visible spindle poles during anaphase. |
1 points
Question 14
A carcinogen is any substance or environmental condition that ______.
increases the frequency of mutation | ||
causes direct damage to DNA | ||
inhibits mitosis in cancer cells |
1 points
Question 15
Angelina observes a slide containing whitefish blastula sections. She finds a cell with visible spindle lines extending from two points on opposite sides of the cell and chromosomes as small black Xs halfway between the two poles. What intracellular structure forms each of the two points on opposite sides of this cell?
a metaphase plate | ||
a cell plate | ||
a pair of centrioles |
1 points
Question 16
Which of the following best describes the relationship between interphase and the cell cycle?
Interphase is a gap between rounds of cell division. | ||
Interphase comprises a large majority of the cell cycle in almost all cells. | ||
Interphase comprises a large majority of the cell cycle in slowly and non-dividing cells. |
Question 17
Radiation therapy and chemotherapy are cancer treatments that primarily attack cancer cells through ______.
activating apoptosis in any rapidly dividing cells to kill off tumor cells | ||
destroying the blood vessels in cancerous tumors to block the flow of nutrients | ||
damaging DNA to the extent that cells die if they cannot repair the damage |
1. | In addition to identifying the genetic material, the experiments of Avery, MacLeod, and McCarty with different strains of Streptococcus pneumoniae demonstrated that | ||||||||||
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2. | In order to show that DNA in cell extracts is responsible for genetic transformation in Streptococcus pneumoniae, important corroborating evidence should indicate that _______ also destroy transforming activity. | ||||||||||
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3. | Based on what you have learned about the experiments conducted by Griffith and Avery and colleagues with bacteria, which of the following would result in transformation of living R cells? | ||||||||||
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4. | A-T base pairs in a DNA double helix | ||||||||||
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5. | If 23 percent of the bases in a sample of double-stranded DNA are adenine, what percentage of the bases are uracil? | ||||||||||
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6. | The uniform diameter of the DNA structure provides evidence for | ||||||||||
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7. | If a sequence of one strand of DNA is 5â²-TGACTATC-3â², what is the complementary strand? | ||||||||||
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8. | What structural aspect of the DNA facilitates dissociation of the two DNA strands for replication? | ||||||||||
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9. | If the MeselsonâStahl density gradient experiment had resulted in two bands of DNA molecules after only one round of replication, one containing only 15N and the second only 14N, this result would have indicated that replication was | ||||||||||
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10. | The nucleoside analogue acyclovir, which is used to treat herpes simplex virus (HSV) infections, lacks a 3â² hydroxyl group (âOH). Predict what will happen if the host cell DNA polymerase incorporates a molecule of acyclovir into an elongating strand of HSV DNA. | ||||||||||
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11. | Which of the following does not demonstrate the stability of the DNA double helix? | ||||||||||
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12. | What effect would a primase inhibitor have on DNA replication? | ||||||||||
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13. | To replicate their DNA in a timely manner, most eukaryotic chromosomes | ||||||||||
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14. | Which statement about DNA replication is false? | ||||||||||
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15. | In many eukaryotes, there are repetitive sequences called telomeres at the ends of chromosomes. After successive rounds of DNA replication, the _______ strand becomes shorter. In some cells, an enzyme called _______ repairs the shortened strand. | ||||||||||
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16. | A researcher studies normal human fibroblast cells. They can be maintained in culture but die off after about 30 cell generations. Unexpectedly, a colony of cells continues to survive and divide past 30 generations. Which scenario is most likely true for these cells? | ||||||||||
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17. | If DNA polymerase III introduces an incorrect nucleotide, what is the first corrective action made by the DNA repair system? | ||||||||||
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18. | Choose the correct order of the following four events in the excision repair of DNA: (1) Base-paired DNA is made complementary to the template. (2) Damaged bases are recognized. (3) DNA ligase seals the new strand to existing DNA. (4) Part of a single strand is excised. | ||||||||||
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19. | Six complete cycles of PCR should result in a _______-fold increase in the amount of DNA. | ||||||||||
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20. | When double-stranded DNA is heated to temperatures above 90°C, it denatures. Denaturation is a process that | ||||||||||
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