The two major atmospheric gases that absorb energy from the Sun are
A) oxygen and nitrogen.
B) nitrogen and hydrogen.
C) hydrogen and carbon dioxide.
D) carbon dioxide and water vapor.
D
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Neural transmission across a mammalian synapse is accomplished by _____
A) the movement of sodium and potassium ions from the presynaptic neuron into the postsynaptic neuron B) impulses traveling as electrical currents across the synapse C) impulses causing the release of a chemical signal and its diffusion across the synapse D) impulses ricocheting back and forth across the synapse E) the movement of calcium ions from the presynaptic into the postsynaptic neuron
Heritable units of information about traits are called __________.
Fill in the blank(s) with the appropriate word(s).
Which of the following is found in "chain-like" strings of coccus shaped bacteria?
a) streptococcus b) staphylococcus c) gonococcus d) diplococcus e) vibrio
Which of the following statements about animal connective tissues is true?
(a) Enzymes embedded in the plasma membrane synthesize the collagen in the extracellular matrix extracellularly. (b) In connective tissue, the intermediate filaments within the cells are important for carrying the mechanical load. (c) Cells can attach to a collagen matrix by using fibronectin, an integral membrane protein. (d) Proteoglycans can resist compression in the extracellular matrix.