Why is it necessary for many sperm to be present in order for one to fertilize the egg?
A) A mass of sperm is necessary to open the uterine tube.
B) The combined enzymes digest a path through the corona radiata and zona pellucida.
C) The combined motion of their flagella enables one sperm to push its way into the egg.
D) A mass of sperm is necessary to gain entry into the ovary.
E) A sperm cannot find the egg by itself.
B
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Which type of chromosome deletion is caused by two concurrent chromosome breaks (rather than a single break)?
A) acentric deletion B) microdeletion C) terminal deletion D) partial deletion E) interstitial deletion
Hornworts are members of phylum:a
Pteridophyta. b. Anthocerophyta. c. Bryophyta. d. Hepatophyta. e. Anthophyta
Opening and closing of the stomata:a
occur during prolonged periods of drought. b. occur when there is a high concentration of carbon dioxide in the leaf. c. are under hormonal control
d. are triggered by darkness. e. are controlled by the changes in shape of the companion cells.
If the residuals of a regression model, Yi = B + MXi + Ei, are such that their variances vary across all values of X, then they are said to be:
A. heteroscedastic. B. endogenous. C. homoscedastic. D. exogenous.