In the lysogenic bacteriophage life cycle, the ? chromosome

A) replicates and the phage genes take over the bacterium.
B) inserts itself physically into the host cell's chromosome.
C) expresses a repressor protein gene that inhibits the lytic pathway.
D) is replaced by a piece of bacterial DNA when packaged inside phage progeny.
E) Both B and C


E

Biology & Microbiology

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The method of sequencing genomic fragments cloned straight from the genome is:

A. Cytogenetic mapping B. Shotgun sequencing C. Southern blotting D. Polymerase chain reaction

Biology & Microbiology

In DNA the pyrimidines are

a. thymine and cytosine. b. adenine and cytosine. c. adenine and guanine. d. thymine and adenine. e. guanine and thymine.

Biology & Microbiology

When phospholipids are mixed with water their interact with water and their are repelled, forming a lipid bilayer.


A. hydrophilic tails; hydrophobic heads
B. hydrophilic heads; hydrophobic tails
C. hydrophobic heads; hydrophilic tails
D. hydrophobic tails; hydrophilic heads
E. hydrophilic heads; hydrophilic tails

Biology & Microbiology

The lipid layer that forms the foundation of cell membranes is primarily composed of molecules called ________.

A. proteins B. carbohydrates C. fats D. phospholipids

Biology & Microbiology