Chapter 25 Practice Questions

The hereditary material found in all cells is

• DNA

• rRNA

• mRNA

• tRNA

• ATP

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

The X-ray diffraction photography of Rosalind Franklin and Maurice Wilkins was critical to showing that

• • DNA has a double-helix structure.

• • the bases of DNA were held together by hydrogen bonds.

• • DNA has equal numbers of purines and pyrimidines.

• • DNA has deoxyribose sugar rather than ribose sugar.

• • the four bases of DNA are adenine, guanine, cytosine, and thymine.

The individual(s) given the most credit for the discovery of the structure of DNA is (are)

• • Alfred Hershey and Martha Chase.

• • James Watson and Francis Crick.

• • Erwin Chargaff.

• • Rosalind Franklin and Maurice Wilkins.

• • Charles Darwin and Gregor Mendel.

Tags

NGSS.HS-LS1-1

If a species contains 23% A in its DNA, what is the percentage of guanine it would contain?

• • 23%

• • 46%

• • 25%

• • 44%

• • 27%

In DNA, the amount of adenine is always equal to the amount of 

• • cytosine.

• • uracil.

• • guanine.

• • thymine.

• • ATP.

A nucleotide contains

• • DNA and RNA.

• • a sugar and a phosphate.

• • complementary purines and pyrimidines.

• • RNA, protein, and lipids.

• • a sugar, a phosphate, and a nitrogen-containing base.

Which of the following is true about RNA?

• • The structure is a double helix.

• • The bases are held together by hydrogen bonds.

• • The bases are complementary to each other.

• • It contains deoxyribose sugar.

• • It contains the bases adenine, guanine, cytosine, and uracil.

Which of the following statements about DNA replication is correct?

• • As hydrogen bonds break, the DNA molecule reforms its helical structure.

• • The process is known as conservative replication because both old strands are conserved in one daughter DNA molecule and two new strands comprise the other daughter DNA molecule.

• • The enzyme that catalyzes DNA replication is DNA polymerase.

• • Complementary base pairs are held together with covalent bonds.

• • Only the leading strand utilizes the enzyme helicase.

The enzyme that is used to join DNA nucleotides together is

• • DNA polymerase.

• • RNA polymerase.

• • helicase.

• • primase.

• • lipase.

Because every DNA molecule contains one old strand and one new strand, the process of DNA replication is called

• • conservative.

• • semiconservative.

• • mixed.

• • dispersive.