Which one of the following cytoskeletal elements is associated with supporting the movement of materials inside the cell?
a. intermediate filaments
b. both microtubules and microfilaments
c. microfilaments
d. microtubules
Ans: b. both microtubules and microfilaments
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The water vascular system in echinoderms is used for locomotion, water enters the water vascular
system of a sea star through a structure called the
a. ampulla. b. ossicle. c. radial canal. d. ring canal. e. madreporite.
Ribosomes that do not anchor on the surface of the rough endoplasmic reticulum during translation most probably
A) are synthesizing cytoplasmic proteins. B) have a defect in ribosomal proteins that allow attachment to the surface. C) have a signal peptidase error. D) do not make the appropriate anchor protein. E) All of the above are probable reasons.
In humans, the volume of an egg is 100 times the volume of a sperm. Compared to the amount of chromosomal DNA in an egg, the amount of chromosomal DNA in a sperm is
A) variable but usually less than one-hundredth that of the egg. B) exactly one-hundredth that of the egg. C) one-fourth that of the egg. D) one-half that of the egg. E) equal to that of the egg.
Streak plates are most useful in
A) isolating individual cells. B) allowing colony morphology to be observed. C) separating different organisms. D) all of the above.