Which item below is unique to eukaryotic cells?
a. cell wall
b. plasma membrane
c. nucleoid
d. ribosomes
e. vacuole
ANSWER: e
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The macromolecules responsible for bacterial adherence that are NOT covalently attached to bacteria are collectively called
A) lipid A. B) biofilms. C) capsules. D) glycocalyx.
Which of the following occurs during gastrulation?
a. formation of the gray crescent region b. formation of ectoderm, mesoderm, and endoderm c. closure of the archenteron d. formation of the blastocoel e. radial cleavage takes place
Which of these cell types is not involved in cell-mediated immunity?
A) plasma cells B) TH1 cells C) T helper cells D) T regulatory cells E) T cytotoxic cells
Isotopes are atoms of the same element that differ in
A) the number of protons and electrons found in the atom. B) the number of protons found in the nucleus. C) the number of protons and neutrons found in the nucleus. D) the number of electrons orbiting the nucleus. E) the number of neutrons found in the nucleus.