Ch 12 DNA Part 1: Question Preview (ID: 6363)

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Avery’s experiments showed that bacteria are transformed by
a) RNA.
b) DNA.
c) proteins.
d) carbohydrates.

What did Griffith observe when he injected a mixture of heat-killed, disease-causing bacteria and live harmless bacteria into mice?
a) The disease-causing bacteria changed into harmless bacteria.
b) The mice developed pneumonia.
c) The harmless bacteria died.
d) The mice were unaffected.

What would Hershey and Chase have concluded if both radioactive 32P and 35S were found in the bacteria in their experiment?
a) The virus’s protein coat was not injected into the bacteria.
b) The virus’s DNA was not injected into the bacteria.
c) Genes are made of protein.
d) Both the virus’s protein coat and its DNA were injected into the bacteria.

Which of the following is a nucleotide found in DNA?
a) ribose + phosphate group + thymine
b) ribose + phosphate group + uracil
c) deoxyribose + phosphate group + uracil
d) deoxyribose + phosphate group + cytosine

Because of base pairing in DNA, the percentage of
a) adenine molecules in DNA is about equal to the percentage of guanine molecules.
b) pyrimidines in DNA is about equal to the percentage of purines.
c) purines in DNA is much greater than the percentage of pyrimidines.
d) cytosine molecules in DNA is much greater than the percentage of guanine molecules.

In eukaryotes, DNA
a) is located in the nucleus
b) floats freely in the cytoplasm
c) is located in the ribosomes.
d) is circular.

During mitosis, the
a) DNA molecules unwind.
b) histones and DNA molecules separate.
c) DNA molecules become more tightly coiled.
d) nucleosomes become more tightly packed.

Which of the following include all the others?
a) DNA molecules
b) histones
c) chromosomes
d) nucleosomes

DNA is copied during a process called
a) replication.
b) translation.
c) transcription.
d) transformation

DNA replication results in two DNA molecules,
a) each with two new strands.
b) one with two new strands and the other with two original strands.
c) each with one new strand and one original strand
d) each with two original strands.

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