Which of the following do(es) not contribute to the construction of membrane phospholipids?
A. Fatty acid biosynthesis
B. Glycolysis
C. Amino acid biosynthesis
D. Nucleotide biosynthesis
Answer: D
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When assembling a fish aquarium one must add a conditioner to the water that contains bacteria capable of metabolizing fish waste such as ammonia, nitrate, and nitrite that accumulates in the aquaria water. Which of the following components of signal reception and transduction is NOT required for the bacterial two-component regulatory system for metabolizing these nitrogenous waste products?
A. NarQ receptor B. NarL transcriptional activator C. a protein kinase D. metabolic enzymes E. ligand-gated calcium channel
The region within the prokaryotic cell where the DNA is located is known as the ________
Fill in the blank with correct word.
_________ occurs when an intravenous injection of antibodies, bsuch as gamma globulin is administered to someone as a treatment. The serum used for emergency treatment of snakebites is an example of this type of immunity.
A) Artificial passive immunity. B) Artificial active immunity. C) Natural passive immunity. D) Natural active immunity. E) Artificial specific immunity.
For the inducible lac operon to be turned on, the
a. lactase (enzyme) must not be in excess. b. substrate (lactose) must be absent. c. substrate must be present and bind the repressor protein. d. RNA polymerase must be blocked from transcribing the genes.