Prokaryotes ____.
A. have a nucleus
B. have complex, usually membrane-bound organelles
C. always have cell walls
D. are either bacteria or archaea
E. always have flagella
Answer: D
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What are antigens?
A. non-self proteins or cells B. proteins on the surface of B-cell membranes C. proteins that consist of two light and two heavy chain polypeptide chains D. proteins on the surface of macrophage membranes E. proteins on the surface of T-cell membranes
The intercellular spaces between plant cells
a. contain air. b. are responsible for cytoplasmic streaming. c. produce energy for the cell. d. contain chloroplasts.
Peptides and small proteins are generally too large to be transported into cells using transport proteins or by moving through pores. The macromolecules are brought into the cell using
A) diffusion. B) exocytosis. C) gated channels. D) endocytosis. E) open channels.
In targeting a protein to the ER lumen, the SRP RNA functions
A. as a scaffold. B. as a guide. C. to alter protein function. D. as a ribozyme. E. in the process of transcription.