Red blood cells in mammals ____
a. have a large nucleus when they enter circulation
b. do not have a nucleus when they enter circulation
c. are the only cells to lack hemoglobin
d. develop in the yellow marrow
e. function as part of the immune system
ANSWER: b
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An ideal vector
A. may be a plasmid or bacteriophage. B. has a restriction enzyme recognition site. C. contains an origin of replication. D. contains a selectable marker. E. All of the choices are correct.
On the accompanying illustration, "A" and "B" should be labeled, respectively, ____ and _____
a. consumers; producers b. decomposers; producers c. producers; redistributors d. producers; consumers e. consumers; decomposers
Tissue whose cells are striated and fused at the ends
by adhering junctions so that the cells contract as a unit is __________ muscle. a. smooth b. skeletal c. visceral d. cardiac e. none of these
The energy driving the global water cycle is provided by
A) wind. B) tides. C) rotation of the Earth on its axis. D) solar energy.