Foreign substances that elicit an immune response are called:

A. Antibodies
B. Interleukins
C. Cytokines
D. Antigens


Answer: D. Antigens

Biology & Microbiology

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Chlorosis in plants is a condition best explained by:

A. lack of water B. lack of certain minerals C. lack of oxygen D. lack of carbon dioxide E. lack of soil moisture

Biology & Microbiology

A repressor protein would have which of the following effects on repressible genes with a negative

control mechanism? a. stimulate transcription in the presence of a corepressor b. turn off transcription in the presence of an inducer c. stimulate transcription in the presence of a coactivator d. turn off transcription in the presence of a corepressor e. no response

Biology & Microbiology

Gene S controls the sharpness of spines in a type of cactus. Cactuses with the dominant allele, S, have sharp spines, whereas homozygous recessive ss cactuses have dull spines. At the same time, a second gene, N, determines whether or not cactuses have spines. Homozygous recessive nn cactuses have no spines at all. The relationship between genes S and N is an example of _____.

A) incomplete dominance B) epistasis C) pleiotropy D) codominance

Biology & Microbiology

Cells that possess a nucleus and a membrane system that establishes internal compartments belong in which of the following groups?

A) viruses B) Bacteria C) Archaea D) eukaryotes

Biology & Microbiology