DNA STRUCTURE AND FUNCTION EXAM

A strand of DNA consists of thousands of smaller repeating units known as

• amino acids
• nucleotides
• polysaccarides
• lipids

In molecules of DNA, which nitrogenous base bonds with adenine?

• adenine
• uracil
• guanine
• thymine

Which nitrogenous base is normally present in DNA but absent from RNA?

• adenine
• cytosine
• thymine
• guanine

Within which organelle does process 1 occur?

• ribosome
• nucleus
• centriole
• lysosome

DNA molecules serve as a template for the synthesis of molecules of

• amino acids
• mRNA
• carbohydrates
• lipids

What is an example of a molecule produced by this type of molecule?

• glucose
• glycogen
• a fatty acid
• a protein

Cosmic rays, X-rays, ultraviolet rays, and radiation from radioactive substances may function as

• pollinating agents
• plant auxins
• mutagenic agents
• animal pigments

Gene mutations occur in plant and animal cell nuclei when

• the hydrogen bases separate during replication
• the base sequence in DNA is changed
• ribose is substituted for deoxyribose in RNA

If strand A represents a portion of a DNA molecule, its complementary sequence of nitrogenous bases on mRNA would normally be

• A-G-A-T-C-A-G-T
• T-C-T-A-G-T-C-T
• A-G-A-U-C-A-G-U

If strand B represents messenger RNA, it would transport the genetic code from the

• ribosome to the nucleus
• nucleus to the ribosome
• mitochondria to the nucleus