A student claims that nitrogenous bases pair randomly with one another. Which statements contradicts student's claim?

Lines 27-29 (“One member... chains”)

“If a pair consisted of two purines, for example, there would not be room for it” (lines 29-30) implies that a pair

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

The molecule is a very long chain, the backbone of which consists of a regular alternation of sugar and phosphate groups

main structure of a chain in a DNA molecule is composed of repeating units.

Based on the table, the % of adenine in each organism’s DNA the same or does it vary. Which statement is consistent?

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

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

emphasize DNA chain serve as template to be copied during DNA replication.

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

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

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SAT Practice Reading

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This reading is about Genetical Implications of the Structure of Deoxyribonucleic Acid (DNA).

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Questions 9

Answers

1
A student claims that nitrogenous bases pair randomly with one another. Which statements contradicts student's claim?
Lines 9-10 (“So far... irregular”)
Lines 5-6 (“To each... types”)
Lines 27-29 (“One member... chains”)
Lines 23-25 (“The bases... other”)
2
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 X-ray evidence
The chemical formula of DNA
The common fiber axis
3
Based on the table and passage, which choice gives the correct percentages of the purines in yeast DNA?
17.1% and 32.9%
18.7% and 31.3%
17.1% and 18.7%
31.3% and 32.9%
4
Which of the following pairs of base percentages in sea urchin DNA provides evidence to the previous question?
17.3% and 32.1%
17.3% and 17.7%
17.3% and 32.8%
17.7% and 32.8%
5
“If a pair consisted of two purines, for example, there would not be room for it” (lines 29-30) implies that a pair
of purines would be larger than the space between a sugar and a phosphate.
of purines would be larger than a pair consisting of a purine and a pyrimid
of pyrimidines would be larger than a pair of purines.
of a purine and a pyrimidine would be larger than a pair of pyrimidines.
6
The molecule is a very long chain, the backbone of which consists of a regular alternation of sugar and phosphate groups
very long chains of DNA can be taken from an organism with a spinal column.
chain in a DNA molecule consists entirely of phosphate groups or of sugars.
very 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.
7
Based on the table, the % of adenine in each organism’s DNA the same or does it vary. Which statement is consistent?
The same; “The important... structure” (lines 25-26)
It varies; “Adenine... thymine” (lines 36-38)
The same; “Two of... pyrimidines” (lines 6-8)
It varies; “It follows... information” (lines 41-45)
8
The authors’ use of the words “exact,” “specific,” and “complement” in lines 47-49 in the final paragraph functions main
the nucleotide sequences are known for most molecules of DNA.
the phosphate-sugar backbone of the authors’ model is completely regular.
emphasize DNA chain serve as template to be copied during DNA replication.
the claim that the sequences of bases along a chain can occur in any order
9
The authors’ main purpose of including the information about X-ray evidence and density is to
present an alternate hypothesis about the composition of a nucleotide.
establish that DNA is the molecule that carries the genetic information.
provide support for authors’ claim about number of chains in a molecule DNA
confirm relationship between density of DNA and known chemical formula DNA

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