What is provided by the mitochondria that are present in the sperm?
a. energy for the movement of the flagellum
b. energy for the acrosome to penetrate the egg
c. nutrients for the developing embryo
d. nutrients for the sperm
Ans: a. energy for the movement of the flagellum
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Which is the proper order of the components of the electrical activity of the heart?
a. AV node ? Purkinje fibers ? SA node b. AV node ? SA node ? Purkinje fibers c. Purkinje fibers ? AV node ? SA node d. Purkinje fibers ? SA node ? AV node e. SA node ? AV node ? Purkinje fibers
Species interactions between members of a community include __________ and __________, in
which one species benefits at the expense of another. Fill in the blank(s) with the appropriate word(s).
Which of the following statements is false?
a. Behavior is influenced by the environmental stimuli an organism receives. b. Behavior is partially genetic so that it undergoes natural selection and evolution. c. Behavior refers only to responses to external stimuli. d. Behavior sometimes is nonadaptive. e. Behavior patterns can be learned.
The genotype FF is known as __________________
A. Homozygous dominant B. Homozygous recessive (ff) C. Heterozygous (Ff)