Moss sperm are produced in
A. antheridia.
B. stomata.
C. sporophytes.
D. lycophylls.
E. archegonia.
Answer: A
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Which of the following statements about progeria is false? a. Progeria arises from a mutation in the gene for lamin
b. Progeriacs die of diseases usually seen in the elderly, like stroke or heart attack. c. The symptoms of progeria begin before age two. d. Progeria can run in families because parents may be unaffected carriers.
Species richness in a habitat depends upon
__________ of each species. a. the history of the habitat b. the resource needs c. the capacity for dispersal d. the unique physiology of the species e. all of these
Movement of food through the digestive tract results from the action of _____
Fill in the blank(s) with the appropriate word(s).
For each of the following sentences, fill in the blank with the appropriate type of gating for the ion channel described. You can use the same type of gating mechanism more than once
A. The acetylcholine receptor in skeletal muscle cells is a(n) _________ ion channel. B. _________ ion channels are found in the hair cells of the mammalian cochlea. C. _________ ion channels in the mimosa plant propagate the leaf-closing response. D. _________ ion channels respond to changes in membrane potential. E. Many receptors for neurotransmitters are _________ ion channels.