Biochemistry Exam 2

Front 1

What four basic roles do lipids play?

Back 1

Primary energy source; important for membrane structure; membrane anchors; signaling proteins

Front 2

The three forms of metabolic pathways are:

Back 2

Linear; cyclic; spiral

Front 3

Example of Linear Pathway

Back 3

Glycolysis

Front 4

Example of Cyclic Pathway

Back 4

Krebs Cycle

Front 5

Example of Spiral Pathway

Back 5

Fatty acid synthesis

Front 6

A nonphotosynthetic organism that requires an organic carbon source such as glucose, is called a/an ___.

Back 6

autotroph

Front 7

___ reactions are those by which the cell synthesizes needed materials, such as proteins and nucleic acids, while ___ reactions are those by which the cell degrades material for energy and building blocks.

Back 7

Anabolic; catabolic

Front 8

A moiety common in the head group of all phosphotidates is ___.

Back 8

phosphate

Front 9

Three common amino alcohols found in phosphotidates are ___, ___, and ___.

Back 9

serine; choline; ethanolamine

Front 10

Enzymes responsible for the phosphorylation of alcohols are called ___.

Back 10

kinases

Front 11

True or False: Relatively strong binding of reactants in the enzymes active site is necessary for efficient catalysis.

Back 11

False

Front 12

True or False: Vitamin K is a lipid vitamin with antioxidant activity.

Back 12

False

Front 13

True or False: Dihydroxyacetone could be described as a ketotetrose.

Back 13

False

Front 14

True or False: Amylopectin is an entirely linear polymer of D-glucose units found in natural starch.

Back 14

False

Front 15

True or False: Epimers are two carbohydrates that differ only in the configuration of groups at a single chiral center.

Back 15

True

Front 16

Monosaccharides that form six-membered rings are called ___.

Back 16

pyranoses

Front 17

Glycolysis is the principle mode of energy generation in the muscle under ___.

Back 17

anaerobic

Front 18

___ are inactive enzyme precursors activated by removal of one or more portions of the precursor molecule.

Back 18

Zymogens

Front 19

Activation of an enzyme by a substrate-initiated conformation change is called ___. ___ is an enzyme that utilizes this strategy.

Back 19

induced fit; hexokinase

Front 20

For a substrate with a positive charge, ___ or ___ might be present near the binding site on an enzyme to aid in substrate binding.

Back 20

aspartate; glutarate

Front 21

Rate enhancement by the binding of reactants close to each other in the enzyme active site is called the ___.

Back 21

proximity effect

Front 22

The most frequently found residue in the active site of enzymes is ___.

Back 22

histidine

Front 23

The cofactor(s) that links one electron and two electron redox processes is (are) called ___.

Back 23

flavins