The force necessary to cause microtubules of cilia and flagella to slide alongside one another is provided through the
action of ____ proteins, which derive the energy to perform their work directly from ____ molecules.
a. kinesin; ADP
b. kinesin; glucose
c. tubulin; ATP
d. dynein; ATP
e. dynein; ADP
d
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Which of the following statements is true regarding the lowest level of a trophic pyramid (that is, the pyramid base)?
A. It contains the greatest amount of energy. B. It contains the greatest amount of carbon. C. It has the largest biomass of all the trophic levels. D. It is often comprised of phytoplankton (if in aquatic environments). E. All of these statements about the lowest level of a trophic pyramid are true.
A sexually reproducing animal that can produce both eggs and sperm and can switch from one sex to another is called
a____ hermaphrodite.
a. simultaneous b. sequential c. parthogenic d. gastrulated e. preferential
What are the modified stems of cacti called?
a. bulbs b. corms c. rhizomes d. tubers
e. cladodesThymine dimers are commonly caused by
A) ultraviolet radiation. B) ionizing radiation such as X-rays. C) tautomers. D) alkylating agents. E) intercalating agents.