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- 1. Multiple-choice30 seconds1 pt
Which result of Frederick Griffith’s experiments led him to believe in a “transforming principle”?
Mice injected with live S bacteria died.
Mice injected with live R bacteria lived.
Mice injected with dead S bacteria lived.
Mice injected with dead S and live R bacteria died.
- 2. Multiple-choice30 seconds1 pt
An important factor in Oswald Avery’s ability to identify the “transforming principle” as DNA was the fact that proteins?
contain very little phosphorus.
were present in the extract made from S bacteria.
do not react with enzymes.
could be observed in the extract made from R bacteria.
- 3. Multiple-choice30 seconds1 pt
Chemical analysis of Avery’s extracts showed that the ratio of nitrogen to phosphorus was consistent with that of
Enzyme
DNA
Protein
Bacteria
- 4. Multiple-choice30 seconds1 pt
Hershey and Chase chose to use bacteriophages in their experiments because these viruses
contain little more than DNA and protein.
can be seen with a light microscope.
can infect only bacteria, not humans.
will not grow in radioactive culture.
- 5. Multiple-choice30 seconds1 pt
As a result of the Hershey and Chase experiments, scientists believe that
radioactive isotopes can be used safely.
viruses use bacterial DNA to reproduce.
the “transforming principle” is DNA.
bacteriophages can be grown in culture medium
- 6. Multiple-choice30 seconds1 pt
The four types of nucleotides that make up DNA are named for their
hydrogen bonds.
nitrogen-containing bases.
phosphate groups.
ring-shaped sugars.
- 7. Multiple-choice30 seconds1 pt
After examining the DNA of different organisms, which of the following did Erwin Chargaff conclude about the four bases?
A = T and C = G.
A = C = G = T.
A = C and G = T.
A + T = C + G.
- 8. Multiple-choice30 seconds1 pt
Which of the following DNA sequences is complementary to the base sequence ACCGTAT?
GTTACGC.
UCCGTAT.
TGGCATA
CAATGCG.
- 9. Multiple-choice30 seconds1 pt
Combining the work of other scientists with their own research, Watson and Crick discovered that two strands of DNA join together to form a(n)
nucleotide
X in a circle.
double helix.
covalent bond.
- 10. Multiple-choice30 seconds1 pt
What holds base pairs together?
hydrogen bonds.
sugar-phosphate backbones.
pairs of double-ringed nucleotides.
nitrogen-carbon bonds
