Honors Genetics

Which of the following describes the difference between a purine and a pyrimidine?

• Purines are single ring structures and include C and A while pyrimidines are double ring structures and include T and G

• Pyrimidines are single ring structures and include C and A while purines are double ring structures and include T and G.

• Purines are single ring structures and include T and C while pyrimidines are double ring structures and include A and G

• Pyrimidines are single ring structures and include T and C while purines are double ring structures and include A and G.

What is the correct sequence of protein synthesis?

A. tRNA brings amino acids to the ribosome

B. DNA molecules serve as the templates for mRNA.

C. mRNA molecules move to ribosomes.

D. Polypeptides are formed on ribosomes.

• A-B-C-D

• B-C-A-D

• C-B-A-D

• D-B-A-C

This is what DNA stands for

• dinucleotideadenosine

• doublenucleotide acid

• dinucleotide acid

• deoxyribonucleic acid

What are the building blocks (monomers) that compose DNA and RNA?

• amino acids

• nucleic acids

• nucleotides

• proteins

A relatively weak bond that forms between the two nitrogen bases holding the two sides of the DNA molecule together.

• hydrogen bond

• covalent bond

• peptide bond

• ionic bond

Deoxyribose is

• the nucleotide of DNA

• the sugar found in DNA

• the sugar found in RNA

• none of the above

Name the three components of the nucleotides that compose DNA.

• sugar, nitrogen base, protein

• sugar, phosphate, hydrogen bond

• phosphate, nitrogen base, hydrogen bond

• sugar, nitrogen base, phosphate

What are Chargaff's (complementary) base pairing rules for DNA?

• A--T

  C--G

• C--G

  A--U

• C--A

  G--T

• C--T

  G--A

1.Which nitrogen base is found in RNA, but not found in DNA?

• thymine

• uracil

• adenine

• guanine

Why is transcription necessary?

• DNA has to directly be used to make a protein, so we have to turn it into amino acids

• DNA can't leave the nucleus, and ribosomes, which make proteins, aren't in the nucleus.

• RNA can't leave the nucleus so DNA has to be converted to make a protein.

• none of the above