Skin and mucous membranes
A. are the first line of innate immunity.
B. are the first line of adaptive immunity.
C. act as physical barriers to infection.
D. contain antimicrobial secretions.
E.
are the first line of innate immunity, act as physical barriers to infection, AND contain antimicrobial secretions.
E
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Transposable elements are considered to be "selfish" genes because they _____
A) have multiple promoters B) require multiple RNA polymerases for transcription C) reproduce without increasing the fitness of the host D) do not produce mRNA
RNAi probably evolved as a mechanism to:
A. aid molecular biologists to experimentally knockdown gene expression. B. catalyze RNA-dependent DNA synthesis. C. suppress infection by RNA viruses. D. generate cell-specificity for certain mRNAs.
DNA polymerase assembles new strands in a ____
a. 5' to 3' direction only b. 5' to 3' direction building one strand and a 3' to 5' direction building the other stand c. 5' to 3' direction building the first half of a strand and a 3' to 5' direction building the second half of a strand d. 3' to 5' direction building the first half of a strand and a 5' to 3' direction building the second half of a strand e. 3' to 5' direction on the "old" 3' to 5' strand
Persistent pollutants that accumulate in living tissue will be most concentrated in the bodies of
A. producers. B. decomposers. C. carnivores. D. herbivores.