In sequence of their occurrence, the four major steps that vertebrate organisms use to obtain and use food are
A. ingestion, digestion, absorption, and elimination.
B. ingestion, absorption, digestion, and elimination.
C. absorption, ingestion, digestion, and elimination.
D. absorption, digestion, ingestion, and elimination.
E. digestion, absorption, ingestion, and elimination.
A. ingestion, digestion, absorption, and elimination.
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Which of the following is an example of gene regulation at the posttranslational level?
A. Initiation of protein synthesis B. Alteration of protein structure C. Prevention of RNA synthesis D. Early termination of an mRNA transcript
Pathogenicity, in viruses, often starts by binding the virus with receptors on the surface of the host cell with high specificity. Once bound, the cell engulfs the viral particles in a vesicle and imports them into the cell. What type of transport is this?
a. secondary active transport b. facilitated diffusion c. receptor-mediated endocytosis d. pinocytosis
Why is the protein-first hypothesis not accepted by most scientists?
a. Proteins cannot be catalysts. b. There is no known mechanism of protein self-replication. c. Of all of the macromolecules, only DNA can self-replicate. d. There is no evidence that proteins can store information. e. Proteins are too complex to have been the first "polymers of life."
Which is correct regarding the rate of microbial death?
A. Upon contact with the control agent, all cells die at one time. B. Cells die at increasingly greater rates. C. Only older cells die in a culture. D. Cells in a culture die at a constant rate. E. Cells become metabolically inactive but are never killed.