What is a necessary component of a powerful immune system?
A. A large thyroid gland
B. Different classes of plasma cells
C. An ability to distinguish self from nonself
D. Thousands of different immunoglobulin genes
E. Strict temperature homeostasis
Answer: C
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Supercoiling has been observed in:
A. chromosomal DNA. B plasmid DNA. C. genomes of double-stranded DNA viruses. D. most circumstances where double-stranded DNA is present in the cell. E. most circumstances of double-stranded cellular DNA, but not double-stranded viral DNA.
Which of the following produce lactic acid?
A. Lactobacillus B. Leuconostoc C. Streptococcus D. Lactococcus E. All of the choices are correct
Bacteria that have a spherical shape are called ________.
A. coccus B. bacillus C. spheroid D. spirillum
The outer membranes of bacteria, mitochondria, and chloroplasts contain large nonselective channels made of multipass proteins known as ________ in which the transmembrane segment of the protein is composed of a ________
Fill in the blank with correct word.