Complete dominance
What will be an ideal response?What will be an ideal response?
A condition in which the dominant allele of a gene completely conceals the presence of the recessive allele of a gene
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Which molecule is a common second messenger?
a. cGTP b. cATP c. PIP2 d. diacylglycerol e. Ras
Why have so few primates gone extinct compared to other groups, for example, mussels or birds?
a. they have large brains b. they are not killed for food or other human uses c. they live in stable environments d. they are among the most closely monitored and protected species e. they are highly mobile
In many species, females choose among males on the basis of their ability to provide necessary resources. Males often establish an exclusive area that includes resources that females require for reproduction. This is called a(n) ____
a. home b. niche c. zone d. reproductive area e. territory
How does the toxin from Clostridium tetani produce its action?
A) It fuses irreversibly to neurons, blocking release of acetylcholine at synaptic clefts. B) The smaller polypeptide of its toxin can block the release of inhibitory neurotransmitters by inhibitory neurons in the central nervous system. C) It is a pyrogenic toxin, which triggers a diffused rash and, later, sloughing of skin. D) It destroys tissues, including muscle and fat. E) Antibodies to the toxin bind the neuromuscular junctions in skeletal muscle preventing relaxation.