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.

Biology & Microbiology

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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

Biology & Microbiology

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.

Biology & Microbiology

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.

Biology & Microbiology

Metals are cycled in the environment by microbes that (oxidize/reduce/solubilize) them.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology