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

C) provide support for the authors’ claim about the number of chains in DNA

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

D) Lines 27-29 (“One member... chains”)

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

D) emphasize how one chain of DNA may serve as a template to be copied

The authors use the word “backbone” in lines 3 and 39 to indicate that

B)the main structure of a chain in a DNA molecule is made of repeating unit

Authors’ stated “If a pair consisted of two purines, for example, there would not be room for it" implies that a pair

of a purine and a pyrimidine would be larger than a pair of pyrimidines.

In the second paragraph (lines 12-19), what do the authors claim to be a feature of biological interest?

D) DNA consisting of two chains

Do the data in the table support the authors’ proposed pairing of bases in DNA?

A) Yes - % of adenine is closest to thymine and % guanine to cytosine

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Week 2 Bell Ringer

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SAT Reading Practice Test Spring AP English 2B

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Questions 8

Answers

1
The authors’ main purpose of including the information about X-ray evidence and density is to
C) provide support for the authors’ claim about the number of chains in DNA
A) establish that DNA is the molecule that carries the genetic information.
B) present an alternate hypothesis about the composition of a nucleotide.
D) confirm the relationship between the DNA density and chemical formula.
2
A student claims that nitrogenous bases pair randomly with one another. Which contradicts the student's claim?
C) Lines 23-25 (“The bases... other”)
D) Lines 27-29 (“One member... chains”)
A) Lines 5-6 (“To each... types”)
B) Lines 9-10 (“So far... irregular”)
3
The authors’ use of the words “exact,” “specific,” and “complement” in lines 47-49 in the final paragraph functions to
B) counter claim-sequences of bases along a chain can occur in any order
D) emphasize how one chain of DNA may serve as a template to be copied
A)confirm that the nucleotide sequences are known for most molecules of DNA
C) support the claim that the phos-sugar backbone of the authors’ model
4
Based on the table and passage, which choice gives the correct percentages of the purines in yeast DNA?
C) 18.7% and 31.3%
D) 31.3% and 32.9%
A) 17.1% and 18.7%
B) 17.1% and 32.9%
5
The authors use the word “backbone” in lines 3 and 39 to indicate that
C)a chain in a DNA molecule consists entirely of phosphate groups or sugars
B)the main structure of a chain in a DNA molecule is made of repeating unit
A) only very long chains of DNA can be taken from an organism with a spine
D) nitrogenous bases form the main structural unit of DNA.
6
Authors’ stated “If a pair consisted of two purines, for example, there would not be room for it" implies that a pair
of a purine and a pyrimidine would be larger than a pair of pyrimidines.
C) of pyrimidines would be larger than a pair of purines.
B) of purines would be larger than a pair of a purine and a pyrimidine.
A) of purines would be larger than the space between a sugar & phosphate
7
In the second paragraph (lines 12-19), what do the authors claim to be a feature of biological interest?
A) The chemical formula of DNA
C) The X-ray evidence
D) DNA consisting of two chains
B) The common fiber axis
8
Do the data in the table support the authors’ proposed pairing of bases in DNA?
B) Yes - % of adenine is closets to guanine and % to cytosine to thymine
C) No - % of adenine is closest to thymine and % guanine to cytosine
A) Yes - % of adenine is closest to thymine and % guanine to cytosine
D) No - % of adenine is closets to guanine and % to cytosine to thymine

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