Plaque is caused by many organisms but one of the
main causes is
a. fungal chitin.
b. protistan lipids.
c. algal alginates.
d. extracellular products of bacteria
e. all of these.
Answer: d
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Spiders and certain other arthropods which lack jaws or mandibles are placed in a subphylum called
A. Agnathae. B. Amandibulata. C. blood suckers. D. chelicerates. E. mandibulates.
Aerobic respiration became established as a
result of the evolution of a. the first proto-cells. b. the first true cells. c. metabolism. d. the cyclic pathway of photosynthesis. e. the noncyclic pathway of photosynthesis
A short segment of an mRNA molecule is shown below. The polypeptide it codes for is also shown:
5'-AUGGUGCUGAAG : methionine-valine-leucine-lysine Assume that a mutation in the DNA occurs so that the fourth base (counting from the 5' end) of the messenger RNA now reads A rather than G. What sequence of amino acids will the mRNA now code for? (You do not need a copy of the genetic code to answer the question.) A) methionine-valine-methionine-lysine B) methionine-lysine-leucine-lysine C) methionine-leucine-leucine-lysine D) methionine-methionine-leucine-lysine E) methionine-valine-leucine-lysine
Myasthenia gravis is a disease caused by the immune system that attacks the acetylcholine receptors found on muscle cells. What effect would blocking these receptors have on muscle contraction?
What will be an ideal response?