Helminths are identified in the laboratory by microscopic examination of body fluids and excretions containing the eggs and larvae.
a. true
b. false
Ans: a. true
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One predator avoidance mechanism that has evolved in prey is
A) chemical defenses and bright coloration. B) secretion of digestive enzymes that hydrolyze glucose. C) secretion of enzymes that break down toxic plant compounds. D) development of a short gestation period.
Many people, when they have a sinus headache, often use decongestant nasal sprays. Why are such sprays useful?
A) They have a pain-blocking effect in the brain. B) They dry out the breathing passageways in the pharynx, making it easier to breathe. C) They reduce swelling, allowing the sinuses to drain. D) They reduce the symptoms of sore throat inflammation, which exacerbates the pain.
Which of the following is found in DNA but not in RNA?
A. ribose B. nucleotides C. adenine D. thymine E. uracil
When considering the initiation of transcription, one often finds consensus sequences located in the region of the DNA where RNA polymerase(s) binds. Which of the following is a common consensus sequence?
A) satellite DNAs B) GGTTC C) any trinucleotide repeats D) TATAAT E) TTTTAAAA