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.
Biology & Microbiology
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