Which of the following represents a testcross?
a. RrMm ? RrMm
b. RRMM ? rrmm
c. rrMM ? RRmm
d. RrMm ? rrmm
Ans: d. RrMm ? rrmm
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A distinctive feature of eukaryotes is the organization of tightly packaged chromosomal DNA with proteins into a membrane-bound structure called a:
A. nucleolus. B. cell. C. nucleus. D. plasma membrane.
Which statement about guard cells is false?
A. Fern guard cells shrink and swell in concert with adjacent epidermal cells. B. Angiosperm cells shrink and swell in concert with adjacent epidermal cells. C. Angiosperm guard cells exchange solutes with adjacent epidermal cells. D. The resting state of guard cells is closed.
Which of the following presents the steps in the water cycle in the correct order?
a. evaporation, condensation, precipitation b. condensation, sublimation, precipitation c. sublimation, evaporation, condensation d. precipitation, condensation, evaporation
Which of the following is an INCORRECT pairing?
A) protozoa; multicellular B) fungi; cell walls C) algae; aquatic and marine habitats D) prokaryotes; no nuclei E) viruses; acellular parasites