When tryptophan levels in a cell are low, a cell will stall transcription but continue translation of the tryptophan operon.
Answer the following statement true (T) or false (F)
False
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Which immune cells can kill cancerous cells that lack MHC markers?
a. effector B cells b. cytotoxic T cells c. natural killer cells d. both cytotoxic T cells and natural killer cells e. all of these
Bird respiration is extremely efficient because birds possess
a. a very long trachea. b. lungs. c. nares. d. air sacs. e. air bladders.
The venous blood in the right ventricle is referred to as "mixed" because the blood that enters the heart
A) is drained from the body. B) comes from tissue with differing metabolic activities. C) contains a mixture of oxygen and carbon dioxide. D) has a lowPO2. E) has a highPCO2.
During this process, a ribosome assembles a polypeptide whose amino acid sequence is specified by the nucleotide sequence in a molecule of mRNA.
A. transcription B. replication C. posttranscriptional modification D. translation