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

Biology & Microbiology

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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

Biology & Microbiology

Bird respiration is extremely efficient because birds possess

a. a very long trachea. b. lungs. c. nares. d. air sacs. e. air bladders.

Biology & Microbiology

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.

Biology & Microbiology

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

Biology & Microbiology