In the ABO blood type system the alleles IA, IB, and i produce Select one:
a. one phenotype.
b. two phenotypes.
c. three phenotypes.
d. four phenotypes.
e. type A and type B blood types only.
d. four phenotypes.
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Compared to antibiotics, there are fewer antiviral agents available because ________.
A. viruses are not as deadly as bacteria so research dollars have been spent developing antibacterial drugs B. before drugs were developed that could directly target virus-specific enzymes, it was thought that any antiviral agent would have to target host cell processes, ultimately damaging cells and tissues C. they are much more costly to produce due to the small size of viruses compared to bacteria D. antibiotics are produced by other bacteria, whereas all antivirals have to be synthesized in a laboratory
Amoebozoans move by means of flagella
_______________ Indicate whether the statement is true or false.
Generalist insect herbivores feed on more than one kind of plant. Typically, how many different families of plants do they feed on?
a. 2 b. 3 c. 5 d. More than 5
Which of the following is not involved in body temperature homeostasis?
A. the hypothalamus B. secretion by sweat glands C. shivering D. constriction or dilation of blood vessels E. respiration rate