A(n) __________ consists of hardened parts at the body surface. Fill in the blank(s) with the appropriate word(s)
ANSWER: exoskeleton
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In eukaryotes, pre-mRNA processing may involve all of the following except
A. removal of exons from the pre-mRNA. B. addition of a 5' cap. C. addition of a 3' poly-A tail D. pre-mRNA splicing by the spliceosome.
How does a fermenter generate proton motive force (PMF) to drive active transport?
A. Fermenters use an electron transport chain for this purpose. B. Fermenters can reverse the direction of the ATP synthase to generate PMF. C. Fermenters cannot generate proton motive force.
What is the estimated influence of genes (as opposed to environment) on a trait called?
What will be an ideal response?
Cells use membranes to help maintain set ranges of ion concentrations inside and outside the cell. Which of the following ions is the most abundant outside a typical mammalian cell?
(a) Na+ (b) K+ (c) Ca2+ (d) Cl–