An ecosystem is a collection of all the ________ in a given area.
A. living and nonliving things
B. plants
C. plants and animals
D. abiotic factors
Answer: A
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Which of the following statements regarding fern alternation of generations is not correct?
A. Ferns have a dominant, diploid sporophyte. B. The fern gametophyte is very small, but very hardy. C. Most fern gametophytes are capable of producing both male and female gametes. D. Chemical signals released by gametophytes producing eggs cause other, nearby gametophytes to also produce eggs. E. The diploid zygote will grow to become the sporophyte.
In the Hardy-Weinberg equation, p2 + 2pq + q2 = 1, 2pq represents the frequency of
A. homozygous dominant and heterozygous individuals. B. homozygous dominant individuals. C. homozygous recessive individuals. D. heterozygous individuals. E. homozygous recessive and heterozygous individuals.
Neurotransmitters transmit action potentials across a(n) ____ in the form of a(n) ____
a. axon terminals; chemical signal b. dendrites; chemical signal c. neuronal cell bodies; electrical signal d. the cytoplasm of axons; potential energy source e. dendritic vesicles; trigger potential
Currently, much commercial lumber and wood products come from which biome?
a. tundra b. temperate rain forest c. savanna d. tropical rain forest e. temperate deciduous forest