Early in the Earth's history, there was a massive "supercontinent" known as
a. Gondwana.
b. Pangea.
c. Botswana.
d. Pellagra.
e. Panagra.
B
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A waxy cuticle prevents desiccation. What is the cost of this adaptation?
A. Lowered light absorption B. Reduced gas permeability C. Slower H2O transport D. Increased exposure to damaging UV radiation E. Increased susceptibility to pathogenic infection
Steroid hormones can trigger gene expression in a select number of cells because ____
a. only target cells allow the steroid hormone to cross the plasma membrane b. nontarget cells have a steroid hormone response element encoded in their DNA c. only target cells have the correct receptor in their cytosol to bind to the hormone d. nontarget cells lack the genes found in target cells e. only target cells have the genes that steroid hormones activate
Estuaries for many transient species are considered:
a. a place to spawn. b. nurseries. c. too full of predators for juveniles. d. very stable environments.
Drug abuse usually involves drugs that
1.are psychoactive. 2.act on the central nervous system. 3.bind to neuron receptors. 4.change the chemical messages that neurons send and receive. 5.all of the choices