The proteins necessary for the use of lactose in E. coli are collectively called the
A. lac regulator.
B. lac suppressor.
C. lac operon.
D. lac promoter.
E. lac transcriptional operator.
C. lac operon.
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At the time of its discovery in 1938, the coelacanth was believed to have been extinct for 66 million years. Coelacanths are unusual fish by any measure; able to grow to the same size and weight as an adult human, live for fifty to sixty years, with eight lobed fins, an intracranial joint that allows it to open its jaw surprisingly wide, and a cranium filled with far more fatty tissue than brain, the coelacanth is frequently described as a living fossil, and reportedly tastes terrible. To which class does the coelacanth belong?
a. Myxini b. Petromyzontida c. Sarcopterygii d. Actinopterygii
Pyruvate is the end product of
a. glycolysis. b. acetyl-CoA formation. c. fermentation. d. the Krebs cycle. e. the citric acid cycle
The presynaptic neuron may decrease the output of a neurotransmitter after being told to do so by ionotropic receptors.
a. True b. False
Your mother worries because every time you drink milk, you have abdominal discomfort and bloating. You tell her not to worry. Explain your problem and how you can treat it
What will be an ideal response?