Bivalves lack which of the following molluscan
features?
a. foot
b. radula
c. mantle
d. shells
e. visceral mass
Answer: b
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A supportive cell wall is found surrounding the plasma membrane of each of the following types of
cells EXCEPT ____.
a. plant cells b. fungal cells c. many types of protists d. animal cells e. bacterial cells
Four of the five answers listed below are
haploid. Select the EXCEPTION.
a. gametophyte b. zygote c. sperm d. egg e. gamete
An inherited human disorder, familial dysautonomia, results from a nucleotide mutation in the gene IKAP that is expressed in the nervous system
The decreased IKAP protein leads to abnormal development, and the resulting disease is usually fatal by age 30. The nucleotide change alters splicing. If this change affects only the nervous system and not the immune system, in which the gene is also expressed, what feature must be found in this gene?
Human viruses can enter human cells by fusion with the cell membrane or by:
a. diffusion into the cell. b. passage through specific protein channels. c. coating themselves with lipids that cloak their entrance into the cell. d. endocytosis. e. hitchhiking onto protein signals entering the cell