Sickle-cell anemia is caused by a
A) recessive sex-linked gene.
B) simple dominant gene.
C) combined interaction of several genes.
D) recessive autosomal gene.
E) dominant autosomal gene.
D
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The rusts and smuts that seriously affect crop plants are
A. ascomycetes. B. zygomycetes. C. chytrids. D. basidiomycetes. E. actinomycetes.
The plant hormone abscisic acid (ABA) is involved in the regulation of photorespiration. Based on this information, ABA likely plays a role in
A. cyclic photophosphorylation. B. the opening and closing of stomata. C. noncyclic photophosphorylation. D. the photoelectric effect.
A sperm count any lower than ______ million sperm per mL of semen is usually associated with infertility (sterility)/
Fill in the blank(s) with the appropriate word(s).
An important function of nomenclature is to
A. facilitate unambiguous communication. B. clarify relationships among organisms. C. provide an understanding of evolutionary relationships. D. define the characteristics used for classification. E. provide a detailed description of an organism.