Unit 4 (EOC/SMA)

During which phase of the cell cycle does most cell growth occur? (1.2.2)

• cytokinesis
• interphase
• prophase
• mitosis

The chemical colchicine disrupts cell division. Which cell process would most likely stop if colchicine were added to a culture of human liver cells? (1.2.2)

• mitosis
• meiosis
• crossing over
• active transport

What would most likely be produced when a cell with eight chromosomes undergoes mitosis? (1.2.2)

• two cells with four chromosomes each
• two cells with eight chromosomes each
• four cells with four chromosomes each
• four cells with eight chromosomes each

Why must DNA replication have to occur before a cell can divide by mitosis? (3.1.1)

• to maintain the same number of chromosomes in the daughter cells as in the parent cell
• to cause one of the cells produced to have double the number of chromosomes as the parent cell
• to allow crossing over to occur in each of the cells produced
• to cause all of the cells produced to have half the number of chromosomes as the parent cell

Which effect could a mutation in mRNA have on the production of proteins? (3.1.1)

• The protein produced will have a different identity.
• The protein produced will have a coiled shape.
• The protein produced will produce excess nitrogen.
• The protein produced will produce excess water.

A section of DNA has these bases: TAG CAG TAC Which mRNA sequence is produced from this DNA section? (3.1.2)

• ATC GTC ATG
• AUC GUC AUG
• AUG CUG AUC
• UTC GTC UTG

What carries the instructions for making amino acids in a protein? (3.1.2)

• the nitrogen base on the tRNA
• the hydrogen bonding between nitrogen bases
• the sequence of nitrogen bases on the mRNA
• the nitrogen base bonding on the DNA molecule

During translation, what does the tRNA deliver to the ribosomes? (3.1.2)

• amino acids
• DNA
• mRNA
• proteins

Which will most likely cause an increase in the frequency of genetic mutations in humans? (3.1.3)

• increased exposure to mold spores in the air
• increased exposure to the rising levels of atmospheric CO2
• increased exposure to bacteria in drinking water
• increased exposure to X-rays

Which best summarizes the role of DNA in the production of proteins? (4.1.2)

• DNA moves to the cytoplasm to build proteins.
• DNA transports amino acids to the ribosomes to make proteins.
• DNA contains the instructions used to make proteins.
• DNA breaks hydrogen bonds between amino acids.