DNA/RNA Review

Tyra created a chart that compared DNA and RNA for her science class.

Tyra made a mistake while she was creating her chart. Which BEST identifies the mistake Tyra made?

• DNA is single-stranded while RNA is double-stranded.

• DNA remains in the nucleus while RNA leaves the Nucleus.

• DNA contains ribose sugar while RNA contains deoxyribose sugar.

• DNA has bases of A, G, C, and U while RNA has bases of A, G, C, and T.

In 1951, British biophysicist Rosalind Franklin took X-ray diffraction images of DNA. Her images revealed how the nucleic acids interacted to form the chemical structure of DNA in which shape?

• a linear chain

• a single strand

• a double helix

• an irregular sphere

The structure of nucleic acids, DNA and RNA, differ in that

• DNA's nucleotide sequence is single-stranded, while RNA's nucleotide sequence is double-stranded.

• RNA's backbone is made up of phosphates, while DNA's backbone is made up of nitrates.

• DNA contains a nucleotide with thymine, while RNA contains a nucleotide with uracil.

• RNA contains only three different nucleotides, while DNA contains four different nucleotides.

DNA is composed of two chains with nitrogenous bases that are complementary to one another. If a portion of a DNA strand reads ATC-CGG-AAT, then what would be the complement to this portion of DNA?

• TAC-GGC-TTA

• ATC-CGG-AAT

• TAG-GCC-TTA

• ATG-GCC-AAT

DNA is composed of two complementary strands. This is reflected in the fact that

• the number of cytosines (C) in one strand is always double the number of guanines (G) in the other strand.

• the number of guanines (G) in one strand is always equal to the number of adenines (A) in the other strand.

• the number of thymines (T) in one strand is always double the number of cytosines (C) in the other strand.

• the number of adenines (A) in one is always equal to the number of thymines (T) in the other strand.