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ADVANCED BIOCHEM EXAM QUESTIONS AND ANSWERS LATEST VERSION
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ADVANCED BIOCHEM EXAM QUESTIONS AND ANSWERS LATEST VERSION....
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What level of protein structure is composed of alpha helices, beta sheets, andturns? - ANSWER Secondary
The term __________ is used to indicate Gibbs free energy - ANSWER delta
G
When substrate concentration is equal to Km, the rate of catalysis is
___________ Vmax of the enzyme reaction. - ANSWER half, 0.5, 1/2
Which of the following is the storage form of glucose in animals? - ANSWER
glycogen
Examples of second messengers include - ANSWER all of the above: cAMP,
cGMP, calcium ions, inositol 1,4,5-triphosphate
Vitamin C deficiency is associated with which of the following diseases? -
ANSWER Scurvy
The scientists that proposed the double helical structure of DNA were -
ANSWER none of the above (Watson and Crick)
What is the [H+] concentration in a water sample that has a pH of 6? -
ANSWER 10^-6 M
,What term describes an enzyme without its required cofactor? - ANSWER
apoenzyme
What term describes molecules that have both hydrophilic and hydrophobic
moieties? - ANSWER amphipathic
What type of membrane transporter moves two species in opposite directions
across a membrane? - ANSWER antiporter
Which of the following vitamins is deficient in children with rickets? -
ANSWER Vitamin D
A term that describes a molecule that contains both positive and negative
charges but overall has a neutral charge is a(n) - ANSWER zwitterion
What level of protein structure is indicated by its amino acid sequence? -
ANSWER primary
The less active conformational form of an allosteric enzyme is called the
_______ - ANSWER T state
What shape is seen in the kinetic plot of an enzyme that exhibits cooperative
binding? - ANSWER Sigmoidal
Adenylyl cyclase reacts with ATP to produce __________ - ANSWER cyclic
AMP
, Which of the following is among the most abundant organic molecules in the
biosphere? - ANSWER Cellulose
Only a protein containing multiple subunits could contain the following
structure - ANSWER Quaternary
Which amino acid can form disulfide bonds with itself to produce cystine? -
ANSWER Cysteine
The three-dimensional structure of a protein is called its ________ structure -
ANSWER tertiary
Which of the following coenzymes is derived from nicotinic acid? - ANSWER
pyridoxal phosphate
What term describes enzymes that are activated by proteolytic cleavage? -
ANSWER zymogens
_______ and ________ are teh simplest carbohydrates which are 2-carbon
molecules. - ANSWER Dihyroxyacetone and D-and L-glyceraldehyde
Which of the following types of DNA structurally is a left-handed helix? -
ANSWER Z-DNA
T/F D-amino acids are most often found in proteins - ANSWER False, L-
amino acids
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