Two strands of DNA that have been cut by an endonuclease can be sealed together by a(n)
A. polymerase enzyme.
B. ligase enzyme.
C. exonuclease enzyme.
D. protease enzyme.
E. methylase enzyme.
B. ligase enzyme.
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If a protein to be overexpressed is toxic to the expression host, it is best to select an expression vector that
A) is compatible with a binary vector able to be regulated. B) is inducible. C) has a relatively low copy number per cell. D) prevents folding of the overexpressed protein into its toxic form.
Each DNA strand has a backbone that consists of alternating _____
a. amino acids b. nitrogen-containing bases c. hydrogen bonds d. sugar and phosphate molecules e. types of sugars
Bacteria present in the digestive tracts of some herbivores function to:
a. provide bulk to their feces. b. produce minerals for their hosts. c. detoxify harmful materials found in the food. d. digest the animal waste products from the herbivore diet. e. digest the cellulose cell wall of plant cells.
Which of the following is an agent of the sexually transmitted disease chancroid?
A. Haemophilus aegyptius B. Haemophilus influenzae C. Haemophilus parainfluenzae D. Haemophilus ducreyi E. Haemophilus aphrophilus