Which of the following statements is true?
(a) Proteins destined for the ER are translated by a special pool of ribosomes whose subunits are always associated with the outer ER membrane.
(b) Proteins destined for the ER translocate their associated mRNAs into the ER lumen where they are translated.
(c) Proteins destined for the ER are translated by cytosolic ribosomes and are targeted to the ER when a signal sequence emerges during translation.
(d) Proteins destined for the ER are translated by a pool of cytosolic ribosomes that contain ER-targeting sequences that interact with ER-associated protein translocators.
(c)
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The basement membrane is made of
a. connective tissue. b. epithelial tissue. c. adipose tissue. d. proteins and polysaccharides. e. carbohydrates and lipids.
The information encoded in DNA is used within a cell in a two-stage process. The two stages of this process are called
A) denaturation and renaturation. B) base-pairing and denaturation. C) replication and division. D) transcription and translation. E) replication and transcription.
Enzymes used to cut genes in recombinant DNA research are known as ____.
A. ligases B. restriction enzymes C. transcriptases D. DNA polymerases E. replicases
The rDNA cluster is transcribed in a special region of the nucleus. What is this structure called and what is its morphology?
What will be an ideal response?