Chloroplasts in algae are thought to have arisen from which source?

a. Cyanobacteria
b. Aerobic bacteria
c. Anaerobic bacteria
d. Photosynthetic viruses
e. Aerobic fungi


Answer: a. Cyanobacteria

Biology & Microbiology

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After ejaculation sperm can live for up to ________

a. 106 hours b. 12 hours c. 48 hours d. 72 hours e. 24 hours

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Which of the following statements is

INCORRECT?

a. Enzymes remain unchanged after a reaction. b. Like enzymes, many coenzymes remain unchanged after a reaction. c. Cofactors are atoms or molecules other than proteins that interact with enzymes. d. Coenzymes are organic molecules that interact with enzymes. e. Activity of enzymes may also be affected by the concentration of salt

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A salt will dissolve in water to form

a. acids. b. hydrogen bonds. c. ions other than H+ and OH?. d. bases. e. buffers

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A neuron can relay a more intense signal by ________

A) sending a stronger action potential B) sending more action potentials in a given amount of time C) sending an action potential that travels more quickly D) sending a longer action potential

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