Which of the following cytokines act as a signal between leukocytes?

A. growth factors
B. interferons
C. interleukins
D. tumor necrosis factors
E. chemokines


Answer: C

Biology & Microbiology

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A complex of proteins and small nuclear RNAs that form discrete particles to mediate splicing is a

A) holoenzyme. B) spliceosome. C) nucleosome. D) ribosome. E) chromosome.

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A malignant melanoma is caused by ____

a. heredity b. viruses c. chemical carcinogens d. radiation e. weakened immunity

Biology & Microbiology

Which structure contains the angiosperm egg?

A. style B. stigma C. anther D. embryo sac E. endosperm

Biology & Microbiology

In plants, most chloroplasts are inherited from the maternal plant because maternal gametes contribute the most ________ to the zygote.

A. cytoplasm and mitochondria B. ribosomes C. chlorophyll D. mitochondria E. cytoplasm

Biology & Microbiology