Organisms must constantly bring in certain molecules and ions while keeping others out. This function is accomplished
by ____.
a. the nucleus
b. lysosomes
c. vesicles
d. the plasma membrane
e. the Golgi complex
ANSWER: d
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A student encounters an animal embryo at the eight-cell stage. The four smaller cells that comprise one hemisphere of the embryo seem to be rotated 45 degrees and to lie in the grooves between larger, underlying cells. If we were to separate these eight cells and attempt to culture them individually, then what is most likely to happen?
A disease that can be caused by mutations in different genes is said to have homogeneity
Indicate whether the statement is true or false
A principal problem with inserting an unmodified mammalian gene into a plasmid and then getting that gene expressed in bacteria is that _____
A) prokaryotes use a different genetic code from that of eukaryotes B) bacteria translate only mRNAs that have multiple messages C) bacteria cannot remove eukaryotic introns D) bacterial RNA polymerase cannot make RNA complementary to mammalian DNA
Skin fibroblasts arrested in G0 are stimulated near a wound to enter G1 by _______ growth factor.
a. epidermal b. fibroblast c. platelet-derived d. keratinocyte