If a toxin blocks the receptors for the neurotransmitter on the postsynaptic muscle cell,
____________________.
a. paralysis will occur
b. the person will have a seizure
c. the action potential in the presynaptic cell fails
d. calcium, which can function as a neurotransmitter, will be released
A
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A pine tree is called a sporophyte because it
a. develops from a germinated spore. b. produces spores by meiosis. c. is haploid. d. undergoes fertilization. e. reproduces by both sexual and asexual means.
The portion of a mature sperm that contains enzymes needed for fertilization is the ____
a. head b. midpiece c. body d. tail e. acrosome
The term development refers to all the changes that occur during the life cycle of an organism. __________________ Indicate whether the statement is true or false
A type of virus that infects only bacteria is called a
A) bacteriophage B) retrovirus C) rhinovirus D) coronavirus