Cytotoxic T cells have the ability to
A. produce platelets.
B. increase erythrocyte production.
C. produce antibodies.
D. stimulate thrombin.
E. destroy pathogens.
Answer: E
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If a DNA template strand has a sequence of 3? TACAATGTAGCC 5?, the RNA produced from it will be which sequence?
A. 3?TACAATGTAGCC5? B. 5?ATGTTACATCGG3? C. 5?AUGUUACAUCGG3' D. 3?AUGUUACAUCGG5? E. 3?ATGTTACATCGG5?
Saltwort (Batis) maintains osmotic balance with
a. succulent stems. b. salt glands. c. salt leaves. d. they cannot maintain osmotic balance; they are osmoconformers. e. salt filtration mechanisms in the roots.
One benefit of sexual reproduction over asexual reproduction is that:a
more offspring can be produced. b. the offspring are all identical to the parents. c. the interaction of the genes from both parents brings about genetic variation. d. evolution will occur at a slower rate when there are two parents. e. there is less variation from generation to generation.
The skin is an effective barrier against invading microbes because
A) the outer layers of cells are dead. B) the surface is covered in salt. C) it is well supplied with blood vessels to flush microbes from the surface. D) no microbes are able to survive on the surface. E) the outer layers are dead and covered in salt.