Question 1

What is the first step in protein synthesis?

Accepted Answer

DNA is unzipped in the nucleus.

Answer

mRNA moves to the cytoplasm.

Answer

A ribosome attaches to the mRNA.

Answer

tRNA brings amino acids to the mRNA.

Question 2

What happens when DNA is replicated?

Accepted Answer

A chromosome with two identical DNA strands is formed.

Answer

A gene with two identical DNA strands is formed.

Answer

Genes are copied directly from one cell to another.

Answer

A chromosome with two identical RNA strands is formed.

Question 3

What is true of all genes?

Accepted Answer

They use the same kinds of tRNA during protein synthesis.

Answer

They use the same kinds of mRNA during protein synthesis.

Answer

They use different kinds of tRNA during protein synthesis.

Answer

They use different kinds of mRNA during protein synthesis.

Question 4

Contains ribose sugar.

Accepted Answer

RNA

Answer

DNA

Question 5

DNA and RNA use the same kind of nitrogen bases.

Accepted Answer

False

Answer

True

Question 6

What do cells build using DNA code?

Accepted Answer

Proteins

Answer

Sugars

Answer

Genes

Answer

Chromosomes

Question 7

What is the first step of DNA replication?

Accepted Answer

DNA untwists

Answer

DNA unzips using a protein.

Answer

DNA copies itself.

Answer

Nitrogen bases pair up with each of the bases.

Question 8

Which one of these is NOT a way an error can occur during DNA replication?

Accepted Answer

Adding protein bases

Answer

Changing the order of nitrogen bases.

Answer

Leaving out nitrogen bases

Answer

Adding nitrogen bases

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