The authors’ statement “If a pair consisted of two purines, for example, therewould not be room for it” (lines 29-30)

purines would be larger than a pair consisting of a purine and a pyrimidine

Is the percentage of adenine in each organism’s DNA the same or does it vary, andwhich statement is most consistent with

It varies; “It follows... information” (lines 41-45)

The authors use the word "backbone' in lines 3 and 39 to indicate that

nitrogenous bases form the main structural unit of DNA.

Someone claims that nitrogenous bases pair randomly. Which of the following contradicts that claim?

Lines 27-29 ("One member...chains")

The authors’ main purpose of including the information about X-ray evidence and density is to

provide support for the claim about number of chains in a molecule of DNA

The use of the words “exact,” “specific,” and “complement” in lines 47-49 in the final paragraph functions mainly to

support the phosphate-sugar backbone of the authors’ model is regular

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SAT: Science Reading

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Questions 9

Answers

1
The authors’ statement “If a pair consisted of two purines, for example, therewould not be room for it” (lines 29-30)
purines would be larger than a pair consisting of a purine and a pyrimidine
consisting of a purine and a pyrimidine larger than a pair of pyrimidines
pyrimidines would be larger than a pair of purines.
purines would be larger than the space between a sugar and phosphate group
2
Based on the table and passage, which choice gives the correct percentages of the purines in yeast DNA?
17.1% and 18.7%
18.7% and 31.3%
31.3% and 32.9%
17.1% and 32.9%
3
In the second paragraph (lines 12-19), what do the authors claim to be a feature of biological interest?
DNA consisting of two chains
The common fiber axis
The X-ray evidence
The chemical formula of DNA
4
Is the percentage of adenine in each organism’s DNA the same or does it vary, andwhich statement is most consistent with
The same; “Two of... pyrimidines” (lines 6-8)
It varies; “Adenine... thymine” (lines 36-38)
It varies; “It follows... information” (lines 41-45)
The same; “The important... structure” (lines 25-26)
5
The authors use the word "backbone' in lines 3 and 39 to indicate that
nitrogenous bases form the main structural unit of DNA.
Only long chains of DNA can be taken from an organism with a spinal column
main structure of a chain in a DNA molecule is composed of repeating units
a chain in a DNA molecule consists of phosphate groups or sugars
6
Which of the following pairs of base percentages in sea urchin DNA provides evidence in support of the answer to the
17.3% and 32.8%
17.3% and 17.7%
17.3% and 32.1%
17.7% and 32.8%
7
Someone claims that nitrogenous bases pair randomly. Which of the following contradicts that claim?
Lines 27-29 ("One member...chains")
Lines 23-25 ("The bases...other")
Lines 9-10 ("So far...irregular")
Lines 5-6 ("To each...types")
8
The authors’ main purpose of including the information about X-ray evidence and density is to
provide support for the claim about number of chains in a molecule of DNA
establish that DNA is the molecule that carries the genetic information.
confirm a connection between the density of DNA and chemical formula of DNA
present an alternate hypothesis about the composition of a nucleotide.
9
The use of the words “exact,” “specific,” and “complement” in lines 47-49 in the final paragraph functions mainly to
confirm that the nucleotide sequences are known for most molecules of DNA.
counter claims that sequences of bases along a chain can be in any order
support the phosphate-sugar backbone of the authors’ model is regular
show how chain DNA may serve as a template copied during DNA replication

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