What is the main role of membrane proteins?
A) Hold the phospholipid bilayer together
B) Block materials from entering the cell
C) Regulate the passage of materials in and out of the cell
D) There are no membrane proteins in the plasma membrane
C
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Molecules that consist of two or more different elements in proportions that do not vary are called ________
a. elements b. compounds c. radioisotopes d. ions
Which of the following is not a regulatory mechanism used to control the tryptophan operon in Escherichia coli?
A. Attenuation B. Repression C. Catabolite repression D. All of the choices are correct.
If you examined the human body on a chemical composition basis, which of the following combinations of elements would be most common?
A) O, C, H, N B) O, C, N, Na C) O, C, P, S D) C, N, Ca, S E) C, H, Ca, Cl
What structure is involved in the human sense of balance?
A) outer ear B) oval window C) utricle D) basilar membrane