WGU C190 Biology

A gardener maintains a species of rose that produce either yellow flowers (the dominant phenotype) or white flowers (the recessive phenotype). One day, the gardener observes that a cross between two yellow rose bushes has led to a single rose bush with orange flowers.

What evolutionary mechanism is involved in the change in the gene pool of this species?

• Mutation

• Gene flow

• Genetic drift

• Artificial selection

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Which item is an atom?

• Carbon dioxide

• Nitrogen

• Sucrose

• Methane

Which item would be classified as biotic?

• Light

• Wind

• Temperature

• Fungus

Male peacocks compete with one another to mate female peacocks. Males with more colorful tail feathers attract female mates at a higher rate than those without. Therefore, male peacocks have colorful tail feathers, whereas female peacocks do not.

What is this an example of?

• Sexual selection

• Artificial selection

• Gene flow

• Genetic drift

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Largemouth bass have recently been introduced into ponds that previously did not contain any large, predatory fish.

Which adaptation would help the existing population of small, prey species of fish avoid predation from the largemouth bass?

• Fins with smaller surface areas

• Faster average swim speed

• More noticeable body coloration

• More time actively foraging for food each day

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Which of these is an output of the light-dependent reaction of photosynthesis?

• ATP

• NADH

• Glucose

• Water

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Which molecule is an input to the Calvin-Benson cycle?

• Carbon dioxide

• Oxygen

• Sugar

• Water

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Which stage of cellular respiration releases carbon dioxide as a product?

• Glycolysis

• Krebs cycle

• Electron transport chain

• Calvin cycle

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Which stage of cellular respiration releases the most energy and, therefore, produces the most ATP molecules?

• Citric acid cycle

• Glycolysis

• Krebs cycle

• Electron transport cycle

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In the human body, muscle fibers metabolize sugars to produce energy. Fast-twitch muscle fibers, like those used during short-term, vigorous exercise, carry out an anaerobic process that produces less energy per sugar molecule processed.

Which metabolic process do fast-twitch muscle fibers carry out?

• Fermentation

• Respiration

• Photosynthesis

• Oxidation

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