Practice Biology EOC

Hitchhiker’s thumb (H) is dominant to no hitchhiker’s thumb (h). A woman who does not have hitchhiker’s thumb marries a man who is heterozygous for hitchhiker’s thumb. What is the probable genotypic ratio of their children?

• 0% Hh : 100% hh

• 50% Hh : 50% hh

• 75% Hh : 25% hh

• 100% Hh : 0% hh

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What will most likely be the result if all of the mitochondria are removed from a plant cell?

• It will be unable to carry out respiration

• It will lose water through osmosis

• It will break down the ribosomes in the cell

• It will be unable to photosynthesize

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During strenuous exercise, body temperature increases. The body responds to the increase in temperature by sweating, which helps to reduce the body temperature. Which is demonstrated in this situation?

• excretion

• metabolism

• homeostasis

• synthesis

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What is the function of autotrophs in the carbon cycle?

• To use oxygen to produce glucose

• To take in excess water

• To use carbon dioxide to produce glucose

• To feed herbivores

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A strand of DNA has these bases:

AGC CAT GTA TAC

What is the complementary DNA strand?

• ACG GAT CTA TAG

• TCG GTA CAT ATG

• TGC CTA GAT ATC

• UCG CUA CAU AUG

What type of organic molecule are enzymes?

• carbohydrates

• lipids

• nucleic acids

• proteins

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Which best explains why muscle cells are different from blood cells?

• A mutation occurs during the development of muscle cells but not in blood cells.

• Different genes are activated in muscle cells than in blood cells.

• Muscles cells experience different environmental influences than blood cells.

• Muscle cells are produced by the brain, but blood cells are produced by the heart.

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The yucca plant releases a strong scent at night when the yucca moth is active. The yucca moth, attracted by the scent, gathers pollen from the yucca flower. The yucca moth then deposits her eggs and the pollen on another plant. This ensures that the plant will be cross-pollinated and that the yucca moth larvae have a steady food supply. Which relationship does this best illustrate?

• commensalism

• mutualism

• parasitism

• predation

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Which is a step in the process of producing transgenic bacteria?

• A plasmid is used to replace a faulty gene in a human cell.

• A chain of bacterial amino acids is inserted into human DNA.

• A human gene is inserted into a bacterial plasmid.

• A mutation is produced in a bacterial cell.

What is the function of a restriction enzyme?

• to control the movement of proteins into a cell

• to regulate blood sugar levels

• to produce hormones that regulate digestion

• to cut DNA at a specific nucleotide sequence