Muscle tissue develops from which germ layer of an embryo?
a) endoderm
b) ectoderm
c) gastroderm
d) mesoderm
Answer: d) mesoderm
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. In many cases, negative feedback loops maintain homeostasis by adjusting hormones that act in ____
a. concert b. sequence c. antagonistic ways d. additive ways e. parallel
While digging in your vegetable garden, you accidentally slice a thick root in half with your trowel, and find yourself looking at a bold X shape in the middle of the root. What can you say about the plant this root belonged to?
a. It was probably a monocot. b. It was probably an epiphyte. c. It was probably a dicot. d. It was probably a weed.
Which of the following is NOT true of enzyme
behavior? a. Enzyme shape may change during catalysis. b. The active site of an enzyme orients its substrate molecules, thereby promoting interaction of their reactive parts. c. All enzymes have an active site where substrates are temporarily bound. d. Each enzyme can catalyze only a specific reaction. e. Enzyme activity is not affected by pH and temperature.
What do veins have that arteries lack?
a. a tunica externa b. oxygenated blood c. an inner membrane of endothelium d. blood flowing from the heart e. valves