You are attempting to mutate lambda to affect whether lysis or lysogeny occurs after lambda infection. Which mutation would INCREASE the chances of LYSOGENY over lysis?

A) deletion or inactivation of the cI gene
B) deletion or inactivation of the cro gene
C) overexpression of the cro gene
D) deletion of both the cro and cI genes


Answer: B

Biology & Microbiology

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The 21st and 22nd amino acids found in proteins are the rare amino acids ________ and ________.

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

Matching. Choose the best matching element

1. ___ anticodon 2. ___ McClintock 3. ___ codon 4. ___ messenger RNA 5. ___ polysome 6. ___ promoters 7. ___ transcription 8. ___ translation A. RNA-directed synthesis of polypeptide chains B. sites at which RNA polymerases can bind and initiate transcription C. binds to small subunit platform of a ribosome D. guided and catalyzed by RNA polymerases E. polypeptide chain elongation proceeds independently at each body in this cluster F. discovered transposons G. a tRNA triplet opposite a codon H. a set of three nucleotides

Biology & Microbiology

Which is incorrect about p53?

A. It can direct a cell to kill itself. B. It is routinely given as a cancer therapy. C. It stimulates the activity of DNA repair enzymes. D. It is a protein that monitors the integrity of DNA. E. If nonfunctioning, cells become cancerous.

Biology & Microbiology

What type of tissue lines the intestines, blood vessels, and bronchiole tubes?

A) Muscle B) Nervous C) Epithelial D) Connective

Biology & Microbiology