What are the odds a child will inherit a recessive disorder if one parent is recessive and the other is heterozygous?
a. 33%
b. 75%
c. 25%
d. 50%
e. 40%
d
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Carbon dioxide (CO2) is
A. returned to the atmosphere during respiration and fermentation. B. used by marine organisms to make limestone for their hard shells. C. removed from the atmosphere during photosynthesis. D. a source of carbon for autotrophs. E. All of the choices are correct.
All of the following describe characteristics of sclerenchyma cells, except which?
A. Their function is primarily to transport oxygen and carbon dioxide throughout the leaf. B. They have thick, tough secondary walls. C. Their secondary walls may be impregnated with lignin. D. They form fibers and sclereids. E. They lack living protoplasts when mature.
All of these terms refer in some way to sex
cells except
a. gametes. b. germ cells. c. haploid cells. d. zygotes. e. there is no exception; all of these terms refer to sex cells in some way.
The structure in the accompanying figure labeled ____ is characteristic of the phylum to which this organism belongs
a. brain
b. mouth
c. heart
d. notochord
e. anus