Directional selection favors ____
a. intermediate phenotypes
b. phenotypes at one end of the distribution
c. phenotypic extremes at both ends
d. heterozygous individuals
e. homozygous individuals
ANSWER: b
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One possible reason for the lack of a nucleus in sieve-tube cells may be that the nucleus would:
A. impede bulk flow B. cause the cell to die C. pass through the plasmodesmata and disrupt bulk flow D. cause the cell plate not to form E. interfere with bulk flow in the xylem
The pattern of genetic transmission typical of a multifactorial trait is
A) discontinuous distributions such as 31. B) that of Mendelian inheritance. C) continuous variation of phenotypic expression. D) a 9331 ratio.
Explain why the process in the kidneys is called "filtration." (What is acting as a "filter"?)
What will be an ideal response?
The chemical composition of the bacteria capsule is:
a. mostly carbohydrates b. phospholipids and protein c. carbohydrates and lipids d. carbohydrates and proteins