Atria differ from ventricles in that they
a. are larger.
b. have thicker walls with more muscle.
c. receive blood from veins.
d. have a higher blood pressure.
e. empty through semilunar valves.
Answer: c
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a. myosin motor proteins slide microtubules over each other b. dynein motor proteins slide microtubule doublets over each other c. myosin motor proteins slide actin filaments over each other d. microfilaments contract due to the action of kinesin e. actin filaments contract due to the action of myosin
Strong selection against the recessive phenotype
a. reduces the equilibrium frequency of the recessive genotype b. completely eliminates the recessive genotype c. has no effect on the recessive genotype
On the accompanying illustration, "A" and "B" should be labeled, respectively, ____ and _____
a. consumers; producers b. decomposers; producers c. producers; redistributors d. producers; consumers e. consumers; decomposers
Early-onset Alzheimer's disease, some forms of epilepsy, and one type of ALS are associated with
genes on chromosome number a. 5 b. 13 c. 18 d. 21 e. 22