Unit Test Review

A scientist of an unknown discipline suddenly developed a disease due to a random mutation. Which of the following scenarios is the most likely cause of the disease?

• The scientist caught a virus

• The scientist was exposed to a mutagenic chemical.

• The scientist was exposed to gamma radiation.

• These scenarios are equally possible.

The diagram below represents a form of cellular reproduction. As a result of the process, offspring will have

• the same number of chromosomes but different traits.

• a different number of chromosomes but the same traits.

• a different number of chromosomes and different traits.

• the same number of chromosomes and the same traits.

Which of the following units are repeatedly joined together to form a strand of DNA?

• amino acids
• nucleotides
• fatty acids
• polysaccharides

The enzyme that unwinds the DNA to prepare for replication

• helicase
• replicase
• polymerase
• synthase

DNA replication results in two DNA molecules,

• each one with two original strands
• each one with two new strands
• each one with one new strand and one original strand
• one with two new strands and the other with two original strands

order of replication

• 3, 4, 2, 1
• 3, 1, 4, 2
• 2, 1, 4, 3
• 3, 4, 1, 2

A process in which DNA has the unique ability to make an exact copy of itself.

• Replication
• Translation
• Transcription

Which enzyme is responsible for adding nucleotides?

• Topoisomerase
• DNA Polymerase
• Ligase
• Primase

Nitrogenous bases are joined by which type of bond?

• polar bonds
• ionic bonds
• covalent bonds
• hydrogen bonds

Adenine bonds with ______________.

• Guanine
• Thymine
• Cytosine
• Adenine