A naturally occurring, small, circle of DNA used as a vector to transmit DNA is a
A) plasmid.
B) prion.
C) lipofectin.
D) ring chromosome.
A) plasmid.
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Which structure-function pair is mismatched?
A) nucleolus â€" production of ribosomal subunits B) lysosome â€" intracellular digestion C) ribosome â€" protein synthesis D) Golgi â€" protein trafficking E) microtubule â€" muscle contraction
Tetanus is:
A. a muscle contraction of sustained force. B. a contraction caused by a single action potential. C. an abnormal muscle contraction. D. a contraction where the muscle does not change length. E. a contraction that slowly increases in force.
Which phylum are sponges classified in?
a. Platyhelminthes b. Mollusca c. Nematoda d. Cnidaria e. Porifera
Ctenophores exhibit:a
bilateral symmetry. b. spherical symmetry. c. linear symmetry. d. radial symmetry. e. circular symmetry.