Desert plants often have
A. broad leaves.
B. thick vines.
C. long taproots.
D. shallow roots.
E. soft bark.
C. long taproots.
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Which of the following is/are among the changes sperm may undergo once they enter the female reproductive tract? (Select all correct choices.)
A. changes in the fluidity of the plasma membrane B. loss of surface membrane proteins C. changes in membrane potential D. increased motility E. release of enzymes from the acrosome
The Na+/K+ pump transports ____
a. 2 sodium ions in and 2 potassium ions out b. 2 sodium ions in and 3 potassium ions out c. 2 sodium ions out and 3 potassium ions in d. 3 sodium ions in and 2 potassium ions out e. 3 sodium ions out and 2 potassium ions in
The caplike structure that covers the head of the sperm and releases enzymes that will help the sperm penetrate the egg is the
A. epididymis. B. vas deferens. C. acrosome. D. mitochondrion. E. nucleus.
Which statement about the interaction between genes and environment is most correct?
A. Phenotypic variation is derived from a single source. B. The phenotype, once determined, is invariable. C. The phenotype is produced by interaction of genotype and the environment. D. The phenotype can be quantified into genotypic and environmental components. E. None of these is true.