Which of the following globular proteins is used to form filaments as an intermediate step to assembly into hollow tubes?

(a) tubulin
(b) actin
(c) keratin
(d) collagen


(a)

Biology & Microbiology

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Ionotropic receptors found at synapses are operated via _____

A) ligand-gated ion channels B) second-messenger-gated ion channels C) electrical synapses D) inhibitory, but not excitatory, synapses E) excitatory, but not inhibitory, synapses

Biology & Microbiology

Extracellular fluid includes

a. interstitial fluid. b. plasma. c. intracellular fluid. d. both a and b.

Biology & Microbiology

What are commonly called sea slugs and are actually marine gastropods with a greatly reduced shell?

A. Mollusks B. Cephalopods C. Oligochaetes D. Nudibranchs E. Chitons

Biology & Microbiology

Tandem duplication of a gene may be a result of

a. deletions. b. a recombination error. c. gene conversion. d. translocation. e. point mutation.

Biology & Microbiology