Males are more commonly affected by X-linked recessive genetic disorders than females because ____
a. females have two X chromosomes; therefore, they do not inherit recessive alleles
b. males have only one X chromosome; therefore, they express all recessive X-linked traits
c. males have only one X chromosome; therefore, they have multiple alleles for each X-linked gene
d. Y chromosomes cause X-linked gene mutations
e. males are genetically weaker than females
ANSWER: b
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a. foot. b. visceral mass. c. mantle. d. tentacles. e. radula
Penicillins, cephalosporin and vancomycin act through which of the following mechanisms?
A. disruption of bacterial membranes B. disruption of cell wla lsynthesis C. inhibition of DNA synthesis D. inhibition of mRNA synthesis E. inhibition of nucleotide synthesis
Checkpoints in the cell cycle control system _________.
Fill in the blank(s) with the appropriate word(s).
Which is not considered a disadvantage of having an exoskeleton? a. Exoskeletons can get relatively heavy
b. Molting is needed to grow. c. Unique construction of the joints for appendages. d. It diminishes the ability to maintain buoyancy.