The enzymes that catalyze chemical reactions in cells are what type of molecule?
A. lipids
B. nucleic acids
C. proteins
D. carbohydrates
Answer: C. proteins
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How can freeze-fracture be used to determine the orientation of a protein in a membrane?
A. Freeze-fracture allows a cell to be cleaved in between the lipid bilayer, splitting the plasma membrane into two layers. B. Freeze-fracture allows a cell to be cleaved in such a way as to preserve the embedded proteins. C. Freeze-fracture cuts the membrane in protein-sized components for viewing under an electron microscope.
Why do transcription and translation take place in two different locations?
A) DNA is located in the nucleus, whereas the ribosomes needed for translation are not in the nucleus. B) DNA is located in the nucleus, whereas the ribosomes needed for translation are found outside the cell. C) DNA is located in the nucleus, whereas the ribosomes needed for transcription are found outside the cell. D) Translation takes place in the nucleus, whereas the DNA is located elsewhere.
The ER is contiguous with the golgi apparatus
a. true b. false
A pathogen is best described as
A) a microorganism that remains with the person throughout life. B) any microorganism that causes disease. C) an organism that remains in the body for a short time. D) a microorganism that may cause a disease under certain circumstances. E) a source of microbial contamination.