Bryophytes, like club mosses and certain other tracheophyte plants, require
A. soil to reproduce sexually.
B. shade to reproduce sexually.
C. water to reproduce sexually.
D. sunlight to reproduce sexually.
E. air to reproduce sexually.
Answer: C
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Which of the following is true of plant cells?
A) Plant cells may contain chloroplasts. B) Plant cells are always much larger than animal cells. C) Chromosomes are found only in plant cells. D) Only plant cells have a cell membrane. E) The plant cell has no cell wall.
How is the central portion of a T cell receptor complex functionally analogous to the center of the B cell receptor complex?
A. It has two pieces (chains), just like a B-cell receptor. B. Both receptors bind epitopes (small amino acid sections of antigen molecules). C. Both bind structures directly on the surface of microbes. D. Both can be secreted from lymphocytes to bind to pathogens under certain situations.
Epistasis and multiple alleles differ in that
A) epistasis is an interaction between two genes, and multiple alleles are variants of the same gene. B) epistasis affects males and multiple alleles occur in females. C) epistasis only occurs in genes that have multiple alleles. D) in epistasis one gene masks another, but one allele cannot mask the effect of another.
The seeds of colorful, fleshy fruits are most
likely to be spread by
a. animals. b. water. c. wind. d. gravity. e. a combination of more than one of these.