Which of the following agents lacks a cell wall and is the smallest known free-living form?
a. Chlamydia
b. Mycoplasma
c. Rickettsia
d. Coxiella
B
Chapter 44 addresses a group of bacteria, the mycoplasmas, which are the smallest known free-living forms. Unlike all other bacteria, these prokaryotes do not have a cell wall.
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Which of the following is an accurate description of the plasma membrane?
A. One layer of phospholipids with a number of proteins embedded within B. Two layers of proteins with a few phospholipids embedded within C. Two layers of phospholipids with a number of proteins embedded within D. One layer of proteins with a few phospholipids embedded within
A mutation that changes the third position in a CUU codon to a C would
A) result in a frameshift mutation. B) shorten the protein. C) have no effect on the protein. D) also change the first two positions.
The eyeless gene of Drosophila
a. has counterparts in humans. b. has counterparts in mice. c. has counterparts in squids. d. points to a shared ancestor among evolutionarily distant animals. e. is all of these.
Metals are cycled in the environment by microbes that (oxidize/reduce/solubilize) them.
Fill in the blank(s) with the appropriate word(s).