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

Biology & Microbiology

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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.

Biology & Microbiology

Which of the following produce lactic acid?

A. Lactobacillus B. Leuconostoc C. Streptococcus D. Lactococcus E. All of the choices are correct

Biology & Microbiology

Bacteria that have a spherical shape are called ________.

A. coccus B. bacillus C. spheroid D. spirillum

Biology & Microbiology

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.

Biology & Microbiology