The active of an enzyme___. A. is remote from the site of substrate attachment B

Question

The active of an enzyme___. A. is remote from the site of substrate attachment B. is converted to a product C. is the region where the reaction takes place D. increases the energy of reaction E. includes the entire enzyme In the lock-and-key model of enzyme action, the enzyme active site is throught of as___. A. a rigid, nonflexible shape that fits the substrate exactly B. an area of the enzyme that can adjust to fit th substrate shape C. a key-like shape that fits into a pocket of the substrate surface D. a hydrophilic area on the enzyme surface E. a lock that bars a noncompetitive inhibitor from reacting Consider the R groups of the following amino acids: cysteine:-CH_2SH; alanine: _CH_3: serine: -CH_2OH A. The named for the dipeptide shown below is____. A. alanyleysteine B. alanylserine C. serylalanine D. seryleysteine E. serinealanine A compound that binds to an enzyme, and changes its shape so that a substrate cannot enter the active site, is called a(n) _____. A. cocnzyme B. proenzyme C. steroid D. competitive inhibitor E. noncompetitive inhibitor Hydrophobic interactions help to stabilize the____structure(s) of a protein. A primary B secondary C. secondary and tertiary D. tertiary and quaternary quaternary E. secondary and quaternary the interactions that link the nucleotides in a nucleic acid are A. ionic bonds B. peptide bonds C. hydrogen bonds D. hydrophobic bonds E. Phosphodiester bonds A DNA template having the base sequence A GATG A- would produce a mRNA With a base sequence of____. A. _A G A T G A- B. _U C U A C U- C. _T C T U C T- D. _T C T A C A- E. _A C A U C A- In transcription,____. A. The mRNA produced is identical to the parent DNA B. uracil pairs with thymine C. a double helix containing one parent strand and one daughter strand is produced D. both strands of the DNA are copied E. the mRNA produced is complementary to one strand of the DNA

Explanation / Answer

Enzyme is a biological catalyst that increases the rates of reactions. Enzymes are usually large protein molecules with complex three dimensional structures. Within each enzyme's structure is a specific area called the active site.

The properties and shape of the active site are just right to bind the reactant molecule, usually called the substrate. The substrate fits into the active site in a manner that analogous to a key into lock.

18. The active site of an enzyme C. is the region where the reaction takes place.

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