Biology B Exam Review

1. In humans, where does DNA replication take place?

• cytoplasm

• nucleus

• ribosome

• vacuole

1. A sequence of nucleotides found in the DNA of a chromosome codes for a specific protein or trait. This section of DNA is known as a(n)

• allele

• codon

• gene

• phenotype

1. RNA from a chipmunk is compared to RNA from a worm. Both will contain the

• sugar deoxyribose and the base thymine.

• sugar ribose and the base thymine.

• sugar deoxyribose and the base uracil.

• sugar ribose and the base uracil.

1. A DNA nucleotide could contain the following molecules

• deoxyribose, cytosine, and a lipid

• deoxyribose, thymine, and a phosphate group

• ribose, uracil, and a polypeptide

• ribose, adenine, and thymine

1. Which of the following nucleic acids contains thymine?

• DNA only

• messenger RNA only

• transfer RNA only

• all of the above

Base pairs in DNA are held together by...

• weak peptide bonds

• strong hydrogen bonds

• weak hydrogen bonds

• strong peptide bonds

1. DNA is a polymer consisting of monomers known as

• peptides

• nucleotides

• amino acids

• phosphates

1. In nucleotides, the letters A, G, C, and T represent

• phosphate groups

• deoxyribose sugars

• nitrogen bases

• ribose sugars

1. The cellular process of creating two new DNA molecules from one original copy is called replication. Which statement is the BEST description of this process?

• DNA opens up and RNA copies it.

• DNA opens up and completely unwinds to make two new molecules.

• DNA opens up and each strand is used as a template for making a new strand.

• RNA opens up the DNA and uses each strand as a template for a new strand.

1. If a portion of a messenger RNA molecule contains the base sequence A-A-U, then the corresponding anti-codon on the tRNA base sequence is

• A-A-U

• G-G-T

• T-T-A

• U-U-A