In lineages that moved onto land, gills were replaced
by lungs; kidneys became better at conserving
__________, and the circulatory system became
more efficient. Fill in the blank(s) with the appropriate word(s).
Answer: water
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In order for a G protein to be active:
A. the alpha subunit must bind GTP. B. the beta and gamma subunits must separate from the alpha subunit. C. both the beta and gamma subunits must bind GTP. D. the alpha subunit must bind GTP and the beta and gamma subunits must separate from the alpha subunit.
An oligonucleotide is defined as a:
A. short, double-stranded DNA molecule of known sequence. B. short, single-stranded DNA molecule of known sequence. C. long, single-stranded DNA molecule of unknown sequence. D. short, single-stranded RNA molecule of known sequence. E. long, double-stranded RNA molecule of unknown sequence.
True or false: Osmoconformers tend to live in environments with variable solute concentrations
A. true B. false
What is the three-dimensional shape created by hybrid orbitals that are formed when a carbon atom is covalently bonded with four other atoms?
A. a flat sheet with carbon in the center B. a triangle with carbon in the center C. a cube with carbon in the center D. a tetrahedron with carbon in the center E. All of the above are possible.