What is one function of the muscular system?
a. transmission of electrical signals
b. connection of ligaments to bones
c. heat production
d. exchange of gases with the atmosphere
e. prevention of desiccation
ANSWER: c
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Which of the following is true regarding sympatric speciation?
A. Sympatric speciation requires physical separation of two populations. B. Sympatric speciation requires a selective disadvantage of hybrids (e.g., medium-billed birds) of two diverging populations.
A researcher is looking to create a new form of soybean plant that has a high crop yield and is easy to grow. What are traits that he should select for in this plant (i.e., what traits are particularly attractive for an agricultural crop)?
Select all correct choices. A. long stems or stalks B. short stems or stalks C. long-day plants D. short-day plants E. day-neutral plants
Prior to 1972, a pesticide called DDT was used widely in the United States, but was found to pose risks to human health and wildlife. It was found that DDT contaminated the waterways. Where would the concentration of the nonpolar pesticide been the highest?
A. a seagull B. a mosquito larva C. plankton D. algae E. a minnow
For the inducible lac operon to be turned on, the
a. lactase (enzyme) must not be in excess. b. substrate (lactose) must be absent. c. substrate must be present and bind the repressor protein. d. RNA polymerase must be blocked from transcribing the genes.