Welcome to the Science Quiz 68

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Welcome to the Science Quiz 12 — Science Quiz 68

This is a timed quiz. You will be given 15 seconds per question. Are you ready?

15

0%

A nucleic acid was analyzed and found to contain 37 percent A, 16 percent G, 22 percent C, and 25 percent T. The nucleic acid must be:

Single-stranded DNA

Single-stranded RNA

Double-stranded RNA

None

Correct! Wrong!

Which of the following are purines?

Adenine and Guanine

Adenine and Cytosine

Adenine and Thymine

none

Correct! Wrong!

DNA is a polymer of:

Deoxyribose sugars connected by phosphodiester bonds

Fatty acids

Nucleosides

Nucleotides

Correct! Wrong!

A nucleic acid was analyzed and found to contain 32 percent A, 18 percent G, 17 percent C, and 33 percent T. The nucleic acid must be:

Single-stranded RNA

Double-stranded RNA

Double-stranded DNA

None

Correct! Wrong!

In the Meselson-Stahl experiment, which model of DNA replication was eliminated by the analysis of DNA isolated from bacteria one replication cycle after shifting from 15N to 14N medium ?

Dispersive

All DNA was of intermediate density. The conservative model predicted half DNA of heavy density and half DNA of light density.

Semiconservative

None

Correct! Wrong!

Which of the following are pyrimidines?

Adenine and Cytosine

Cytosine and Thymine

Guanine and Thymine

None of these

Correct! Wrong!

In the semiconservative replication of DNA, progeny DNA molecules consist of: v = √(2gL) , the tension in the string increases just after the striking by ?

All molecules with one parental and one new strand.

One-half of the molecules with two parental strands and one-half of the molecules with two new strands

All molecules with one parental and one new strand

None

Correct! Wrong!

The two polynucleotide chains in DNA are:

Semiconservative

Antiparallel

Semidiscontinuous

None

Correct! Wrong!

Science Quiz 68

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