A deficiency of vitamin D causes
a. scurvy.
b. rickets.
c. kidney stones.
d. a goiter.
e. dwarfism.
B
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The simplest technique for isolating bacteria in growth media is referred to as the
A. pour-plate method. B. streak-plate method. C. serial dilution method. D. MPN method.
Why would a person who has their tonsils removed be more susceptible to certain types of infections of the throat and respiratory tract?
A. Tonsils produce high levels of lactoferrin, a strong natural antibacterial compound. B. Tonsils produce large amounts of interferons, natural antiviral compounds. C. Tonsils are secondary lymphoid organs-they help to provide a constant response to the microbes in the oral cavity, helping to keep them in check and preventing them from spreading to other areas. D. Tonsils are the location where T cells develop and mature. Without them, a person won't have T cells, and will be more likely to suffer from infections that would normally be eliminated by such cells.
Which of the following statements is
CORRECT?
a. A population cannot exceed the carrying capacity even temporarily. b. An organism can occupy more than one trophic level, depending upon the feeding habits of the organism. c. Once populations of organisms become isolated, they remain so by various types of isolation mechanisms. d. The limits of a population are all traced to climatic or physical factors. e. Organisms with different evolutionary backgrounds can occupy the same niche at the same time.
A three-nucleotide sequence in MRNA that specifies a particular amino acid or polypeptide termination signal; The basic unit of the genetic code
What will be an ideal response?