How does a cell "inform" the immune system that it is infected with a virus?
A) It releases histamine into the bloodstream.
B) It displays viral proteins on its membrane.
C) It synthesizes enzymes that activate helper T cells.
D) It secretes steroid hormones.
E) It produces interferon.
B
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In all cells, genes are composed of
A) nucleic acids. B) mRNA. C) proteins. D) chaperones.
From this study, which treatment appears to be the most effective against Dutch elm disease?
a. treatment A b. treatment B c. treatment C d. They are all totally ineffective
Complex phenotypes that are shaped by more than one gene as well as by some aspect of an individual’s environment represent a(n)
1.multifactorial trait. 2.polygenic trait. 3.codominant trait. 4.autosomal trait. 5.recessive trait.
Negative feedback mechanisms regulate
a. Prostaglandins b. Steroids c. Very few hormone d. Most if not all hormones