Order the following choices to reflect the organization of taxa, from the most general to the most specific, to test your understanding of levels of classification.
> Order
> Phylum
> Species
> Domain
> Domain
> Phylum
> Order
> Species
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Four of the five structures listed below are parts of
the forebrain. Select the exception. a. limbic system b. thalamus c. olfactory lobes d. cerebellum e. cerebrum
Inhibitors of enzymes can be either reversible or irreversible. In addition, most reversible inhibitors are either competitive or noncompetitive
Based on what you know about enzyme inhibition, classify the following examples as irreversible, competitive, or noncompetitive enzyme inhibition. A) competitive B) noncompetitive C) irreversible 1) Diisopropyl fluorophosphate binds to acetylcholinesterase and permanently inactivates the enzyme. Paralysis results. 2) A drug binds to the active site of an enzyme but disassociates and leaves the enzyme active. 3) A toxin binds to the surface of an enzyme. The enzyme then binds the substrate, but no product is produced. The toxin may disassociate and the enzyme will become active again. 4) Vitamin K is a coenzyme involved in blood clotting. An anticoagulant drug binds at the site of vitamin K bonding, blocking vitamin K binding and preventing clotting. Clotting resumes after the patient stops taking the drug. 5) Aspirin binds to prostaglandin synthetase and permanently stops its ability to produce prostaglandin.
Each nucleotide in a strand of DNA is composed of a(n) ____________________, a(n) ____________________, and
a(n) ____________________. Fill in the blank(s) with the appropriate word(s).
A locus is ____
a. an alternate form of a gene b. the chromosome location of the centromere c. the location of a gene on a chromosome d. a mutation of a gene to an alternate state e. the site of crossing over