Frog ventilation is
(a) negative pressure inhalation.
(b) positive pressure inhalation.
(c) positive pressure exhalation.
(d) both b and c.
(d) both b and c.
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In order of their occurrence what are the steps in RNA interference?
A. Processing of RNA transcript by DGCR8, binding to RISC, transport to cytoplasm, processing by Dicer, binding to target mRNA B. Processing by Dicer, processing of RNA transcript by DGCR8, transport to cytoplasm, binding to RISC, binding to target mRNA C. Processing of RNA transcript by DGCR8, transport to cytoplasm, processing by Dicer, binding to RISC, binding to target mRNA D. Processing of RNA transcript by DGCR8, processing by Dicer, transport to cytoplasm, binding to RISC, binding to target mRNA
Girdling a tree is eventually lethal because it prevents
a. water uptake. b. photosynthesis. c. respiration. d. sugar transport to roots. e. water transport to leaves.
The process of apoptosis can remove structures such as mammary tissue in male mammals
Indicate whether the statement is true or false.
All members of a group of ornithologists studying barn owls in the wild have had salmonellosis (Salmonella gastroenteritis). One birder is experiencing her third infection. What is the most likely source of their infections?
a. The ornithologists are eating the same food. b. They are contaminating their hands while handling the owls and nests. c. One of the workers is a Salmonella carrier. d. Their drinking water is contaminated.