Once the lac repressor binds to the lac operator site, RNA polymerase is prevented from transcribing the

A. regulatory gene.
B. galactosidase and regulatory genes.
C. galactoside transacetylase gene.
D. galactosidase and galactoside transacetylase genes.
E. galactosidase gene.


Answer: D

Biology & Microbiology

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A person with frequent heartburn is more likely than others to eventually develop this condition

A) Large intestine 

B) Stomach 

C) Esophageal cancer 

D) Appendix 

E) Mouth 

F) Salivary glands 

G) Rectum 

H) Cirrhosis 

I) Gallbladder 

J) Small intestine 

Biology & Microbiology

Dimers of IgA are present in

A) breast milk colostrum. B) saliva. C) tears. D) breast milk colostrum, saliva, and tears.

Biology & Microbiology

If RNA was the first information storage molecule, what macromolecule would have been the "next"

molecule produced in the progression toward living cells?

a. DNA b. lipids c. carbohydrates d. sugars e. proteins

Biology & Microbiology

Eight of the 20 amino acids found in proteins are essential, and must be supplied by the diet. The globin protein of hemoglobin is roughly 10% valine, one the essential amino acids. If a person has no source of valine and an adequate supply of the other 19 amino acids, then the globin synthesis rate will be _____% of its expected level

a. 95 b. 90 c. 80 d. 10 e. 0

Biology & Microbiology