Signal sequences that direct proteins to the correct compartment are _________
(a) added to proteins through post-translational modification.
(b) added to a protein by a protein translocator.
(c) encoded in the amino acid sequence and sufficient for targeting a protein to its correct destination.
(d) always removed once a protein is at the correct destination.
(c) Signal sequences are found within the amino acid sequence of proteins. They are sometimes removed when the protein is at the correct destination [choice (d)], but not all are removed. For example, nuclear import signals are not removed once a protein is inside the nucleus. A protein translocator resides in the membrane and helps transport soluble proteins across the membrane [choice (b)], butdoes not add signal sequences to proteins.
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Which of the following does not apply to eukaryotic gene regulation?
A) gene regulation by attenuation B) regulation as a result of compartmentalization C) mRNA degradation (turnover) D) protein degradation (turnover) E) protein folding
Which of the following is a component of the plasma membrane?
a. glycogen b. vesicles c. phospholipids d. ribosomes
An example of an effector is a(n):
a. sense organ b. efferent neuron c. afferent neuron d. muscle e. interneuron
_______ store materials required by bacteria
Fill in the blank(s) with the appropriate word(s).