Fireflies have the ability to convert the energy in ATP to light. Which of the following types of work is performed by the firefly?

A) bioluminescent
B) heat
C) concentration
D) electrical
E) mechanical


Answer: A

Biology & Microbiology

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The acetylcholine receptor is a ligand-gated channel that produces

A. Depolarization by allowing K+ ions to leave the muscle fiber. B. Depolarization by allowing Cl- ions to enter the muscle fiber. C. Depolarization by allowing Na+ ions to enter the muscle fiber. D. Hyperpolarization by allowing Na+ ions to exit the muscle fiber. E. Repolarization by activating second messenger systems within the muscle fiber.

Biology & Microbiology

John tells you that cholesterol is bad and should be eliminated from the diet. You explain to him that cholesterol is important. Which of the following hormones are synthesized from cholesterol?

A) thyroxine B) growth hormone C) oxytocin D) testosterone

Biology & Microbiology

The visual proof that chromosomes exchange pieces of information during crossing over was provided by __________

A. Bateson and Punnett B. Morgan and Bridges C. Creighton and McClintock D. Watson and Crick

Biology & Microbiology

There are different versions of the gene that codes for fur thickness, one of which codes for

thicker fur and another that codes for thinner fur. In 1995, about 50 percent of the animals had thicker fur, and the other 50 percent had thinner fur. In the spring of 2012, after several years of low snow cover, 70 percent of the population had thicker fur, while only 30 percent had thinner fur. This change in the population is an example of

a. an adaptation. b. evolution. c. natural selection. d. homology.

Biology & Microbiology