Skeletal muscle cells are not typical cells because ____
a. groups of them fuse in the embryo to form multinucleated fibers
b. they are smooth
c. they are hydrostatic
d. they do not respond to stimuli
e. they operate independently from all other body systems
ANSWER: a
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A cohort is ____
a. a group of individuals of the same species born during the same time interval b. any member of the same species c. a group of individuals with the same parents d. a group of individuals of the same sex e. any group of closely related individuals
A string of 30 to 100 adenine nucleotides
A. is found in the promoter region of all genes. B. is the sequence of which introns are composed. C. is found at the 3'-end of all tRNAs. D. is found in the terminator region of all genes. E. is added to the 3'-end on mRNA during RNA processing.
Selective breeding, DNA testing, and genetically modifying crop plants are all applications of
A.) DNA replication. B.) genetic mutations. C.) biotechnology. D.) environment-genotype interactions.
A culture medium made of extracts from yeasts, meat, or plants is a ________ medium.
a) complex b) selective c) differential d) chemically defined