The authors use the word “backbone” in lines 3 and 39 to indicate that
This passage is adapted from J. D. Watson and F. H. C. Crick

Quiz
•
English
•
9th - 12th Grade
•
Hard
Althea George
Used 8+ times
FREE Resource
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
only very long chains of DNA can be taken from an organism with a spinal column
the main structure of a chain in a DNA molecule is composed of repeating units.
a chain in a DNA molecule consists entirely of phosphate groups or of sugars.
nitrogenous bases form the main structural unit of DNA.
2.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
A student claims that nitrogenous bases pair randomly with one another. Which of the following statements in the passage contradicts the student’s claim?
Lines 5-6 (“To each... types”)
Lines 9-10 (“So far... irregular”)
Lines 23-25 (“The bases... other”)
Lines 27-29 (“One member... chains”)
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
In the second paragraph (lines 12-19), what do the authors claim to be a feature of biological interest?
The chemical formula of DNA
The common fiber axis
The X-ray evidence
DNA consisting of two chains
4.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
The authors’ main purpose of including the information about X-ray evidence and density is to
establish that DNA is the molecule that carries the genetic information
present an alternate hypothesis about the composition of a nucleotide.
provide support for the authors’ claim about the number of chains in a molecule of DNA.
confirm the relationship between the density of DNA and the known chemical formula of DNA.
5.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
26 Based on the passage, the authors’ statement “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 group.
of purines would be larger than a pair consisting of a purine and a pyrimidine.
of pyrimidines would be larger than a pair of purines
consisting of a purine and a pyrimidine would be larger than a pair of pyrimidines.
6.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
The authors’ 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 the claim that the sequences of bases along a chain can occur in any order
support the claim that the phosphate-sugar backbone of the authors’ model is completely regular.
emphasize how one chain of DNA may serve as a template to be copied during DNA replication.
7.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Based on the table and passage, which choice gives the correct percentages of the purines in yeast DNA?
17.1% and 18.7%
17.1% and 32.9%
18.7% and 31.3%
31.3% and 32.9%
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