The rootlike projections of mosses, liverworts, and hornworts that anchor them to the substrate are called
A. tap roots.
B. rhizoids.
C. storage roots.
D. fibrous roots.
E. specialized roots.
Answer: B
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A control group is to an experiment as _____ is to a clinical trial.
A) a placebo group B) random assignment C) an independent variable D) a literature review
Rats learning to press a lever to receive food is an example of
A. habituation. B. operant conditioning. C. classical conditioning. D. negative reinforcement. E. avoidance.
Ocean currents ____ in the Northern Hemisphere and ____ in the Southern Hemisphere.
A. circulate counterclockwise; circulate clockwise B. move west to east; move east to west C. move east to west; move west to east D. circulate clockwise; circulate counterclockwise E. undulate along a line northeast and southwest; undulate along a line southeast to northwest
If two parents are heterozygous for an autosomal recessive disease,
considered genetic carriers for the disease. b. their children have no chance of inheriting the disease. c. their children have a 50 percent chance of inheriting the disease. d. all of their children will also be heterozygous.