Science Passages 1, 3, and 6

1. 1. At which of the following times was the transcription

rate of Gene 2 the greatest?

• Time = 0 hr

• Time = 2 hr

• Time = 4 hr

• Time = 6 hr

2. 2. At which of the following times was the transcription

rate of Gene 2 closest to 2 times the transcription rate

of Gene 2 at time = 0 hr ?

• Time = 5 hr

• Time = 7 hr

• Time = 9 hr

• Time = 10 hr

3. 3. Which of the following cellular components is most

directly involved in Step 3 in Figure I

• Cell membrane

• Chloroplasts

• Lysosomes

• Ribosomes

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4. 4. Based on Figure I, which of the following best

describes what happens to introns during gene

expression?

• Introns are transcribed and then translated.

• Introns are translated and then transcribed.

• Introns are transcribed, but not translated.

• Introns are translated, but not transcribed.

5. 5. According to Figures 2 and 3, when the glucose con-

centration of the medium was 12 g/L, the RTR of

Gene 4 was closest to which of the following?

• 0.1

• 0.5

• 09

• 1.3

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12. Based on the passage, would Scientist 1 or Scientist 3

be more likely to argue that the process of cell division

contributes directly to aging, and why?

• Scientist 1, because according to Scientist 1,

  telomeres become shorter each time a cell divides.

• Scientist 1, because according to Scientist 1

  telomeres become longer each time a cell divides.

• Scientist 3, because according to Scientist 3,

  telomeres become shorter each time a cell divides.

• Scientist 3, because according to Scientist 3.

  telomeres become longer each time a cell divides.

13. How does Scientist 2's model differ from Scientist 3's

model? Scientist 2 claims that the mutations that cause

aging:

• are due to telomere shortening, whereas Scientist 3

  claims that the mutations that cause aging are

  present at birth.

• accumulate throughout a human's life span,

  whereas Scientist 3 claims that the mutations that

  cause aging are due to telomere shortening.

• accumulate throughout a human's life span,

  whereas Scientist 3 claims that the mutations that

  cause aging are present at birth.

• are present at birth, whereas Scientist 3 claims that

  the mutations that cause aging accumulate

  throughout a human's life span.

14. Scientist I's model would be most weakened if which

of the following observations were made?

• Telomeres are the same length in both young cells

  and old cells.

• The telomeres in a baby's cells are longer than the

  telomeres in an adult's cells.

• More free oxygen radicals are produced by young

• cells than by old cells.

  More free oxygen radicals are produced by old

  cells than by young cells.

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15. All 3 scientists would most likely agree with which of

the following statements about telomeres?

• Telomeres become shorter as a human ages.

• Telomeres remain the same length throughout a

  human's life span.

• Telomeres become longer as a human ages.

• Changes in telomere length are responsible for

  aging.

16. Scientist 3 proposes that the mutations that eventually

cause aging are:

• produced when telomeres shorten.

• produced by metabolic products.

• present only in old cells.

• present in both young cells and old cells.

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