You are interested in Fuzzy, a soluble protein that functions within the ER lumen. Given that information, which of the following statements must be true?
(a) Fuzzy has a C-terminal signal sequence that binds to SRP.
(b) Only one ribosome can be bound to the mRNA encoding Fuzzy during translation.
(c) Fuzzy must contain a hydrophobic stop-transfer sequence.
(d) Once the signal sequence from Fuzzy has been cleaved, the signal peptide will be ejected into the ER membrane and degraded.
Choice (d) is correct. ER signal sequences are typically at the N-terminus [choice (a)]. More than one ribosome can bind to an mRNA molecule [choice (b)]. Hydrophobic stop-transfer sequences are found on membrane-inserted proteins and not on soluble proteins [choice (c)].
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The three main classes of hormones are:
A. amine hormones, peptide hormones, and steroid hormones. B. lipid soluble hormones, water soluble hormones, and water insoluble hormones. C. polysaccharide hormones, protein hormones, and lipid hormones. D. nucleic acid hormones, lipid hormones, and amine hormones. E. steroid hormones, lipid hormones, and peptide hormones.
An example of a member of the class Anthozoa of the phylum Cnidaria is:
a. Portuguese man-o-war. b. jellyfish. c. sea anemone. d. sea wasp. e. hydroid.
Which of the following is not a component of phenotypic variance?
A) the interaction between genetics and environment B) the covariance C) genetic variance D) environmental variance
Match the target of the G protein with the appropriate signaling outcome
adenylyl cyclase ________ A. cleavage of inositol phospholipids ion channels _________ B. increase in cAMP levels phospholipase C _________ C. changes in membrane potential Fill in the blank(s) with correct word