BIOS 1700 CHAPTER 3 QUESTIONS AND ANSWERS GRADED A+ 2025/2026

BIOS 1700 CHAPTER 3 QUESTIONS AND
ANSWERS GRADED A+ 2025/2026




Non-virulent bacteria can be prevented from being transformed into virulent bacteria if the
debris from heat-killed virulent bacteria is first treated with:



RNase.

DNase.

no enzyme.

protease. - ANS DNase



The strands in a DNA molecule are: (Select all that apply.)



covalently bonded to each other.

perpendicular.

identical.

antiparallel.

complementary. - ANS antiparallel

complementary



Which of the following types of post-transcriptional modification is common in eukaryotes?

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, 5' cap addition

polyadenylation and intron removal

intron removal

polyadenylation

All of these choices are correct. - ANS All of these choices are correct



A template strand of DNA is read in the _____ direction in order to direct synthesis of RNA in
the _____ direction.



5'-3'; 3'-5'

3'-5'; 3'-5'

3'-5'; 5'-3'

5'-3'; 5'-3' - ANS 3'-5';5'-3'



Which of the following CORRECTLY describes the complementary base pairing of adenine in
both DNA and RNA?



Adenine pairs with guanine in DNA and with cytosine in RNA.

Adenine pairs with uracil in DNA and with thymine in RNA.

Adenine pairs with thymine in DNA and with uracil in RNA.

Adenine pairs with thymine in both DNA and RNA.

Adenine pairs with cytosine in DNA and with guanine in RNA. - ANS Adenine pairs with
thymine in DNA and with uracil in RNA



Is the following statement about DNA and RNA true or false? The nitrogenous base thymine is
present in DNA and RNA, while uracil is present only in RNA.

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