Genetics Ryan Oswald

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.

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NGSS.HS-LS3-2

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.

Chemical analysis of Avery’s extracts showed that the ratio of nitrogen to phosphorus was consistent with that of

• Enzyme

• DNA

• Protein

• Bacteria

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NGSS.HS-LS1-1

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.

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

The four types of nucleotides that make up DNA are named for their

• hydrogen bonds.

• nitrogen-containing bases.

• phosphate groups.

• ring-shaped sugars.

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.

Which of the following DNA sequences is complementary to the base sequence ACCGTAT?

• GTTACGC.

• UCCGTAT.

• TGGCATA

• CAATGCG.

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.

What holds base pairs together?

• hydrogen bonds.

• sugar-phosphate backbones.

• pairs of double-ringed nucleotides.

• nitrogen-carbon bonds