The smooth ER is responsible for ________.

a) photosynthesis
b) producing proteins
c) storing genetic information
d) producing lipids


Ans: d) producing lipids

Biology & Microbiology

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How does diffusion limit size in cells?

a. Once a cell attains a particular size, the transport proteins in the cell membrane stop functioning and diffusion fails. b. The size of the cell dictates the size of lipids in the membrane. If the lipids become too large, diffusion becomes slower and the cells can starve. c. As cells increase in size, the surface-to-volume ratio decreases and diffusion becomes too inefficient to provide nutrients and waste disposal from the cell. d. Cells that are of a particular size, or greater, enter a state of torpor and growth slows until the cell shrinks again.

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Prokaryotes

a. have nucleoid regions. b. are unicellular. c. may have cell walls. d. are either bacteria or archaeans. e. are all of these.

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The presence of ________ indicates that the air is healthy for humans to breathe.

A. yeast B. morels C. smuts D. ergot E. lichens

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Which microorganisms are the most susceptible to chemical disinfection?

A) Gram-positive bacteria B) Gram-negative bacteria C) Mycobacteria

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