Biomolecules Exam Questions Flashcards
Niacin is a:
a. nucleotide
b. steroid
c. carbohydrate
d. vitamin
e. nucleoside
d. Niacin is a vitamin
Fructose is a:
a. lipid
b. co-factor
c. carbohydrate
d. vitamin
e. nucleoside
c. fructose is a carbohydrate
What type of biomolecule is co-enzyme A?
Co-factor
What type of biomolecule is stearate?
Stearate is a lipid
What type of molecule is adenosine triphosphate?
A nucleotide
Carbohydrates can not:
a. have the formula (CH2O)
b. be either monomers or polymers.
c. provide energy directly for cellular processes
d. dissolve in water
e. bind to cell-surface proteins
c. Carbohydrates can not provide energy directly for cellular processes.
Labelling of hexose sugars
Hexoses are labelled alpha when the OH group falls below the anomeric carbon.
What is sucrose?
A disaccharide of glucose and fructose.
What is galactose?
A monosaccharide.
What is glycogen?
A glucose polymer - alpha 1 to 4 glycosidic bonds with alpha 1-6 branches.
What is maltose?
A disaccharide of two glucose monomers. Glucosyl alpha(1>4) glucose.
What is amylose?
Linear glucose polymer with alpha glycosidic bonds
Which enzyme is deficient in lactose intolerance?
beta-galactosidase
DNA does not:
a. contain thymine base
b. form pairs of parallel strands by complementary base pairing
c. contain one fewer oxygen in each pentose sugar than RNA
d. have bases extending inwards in a double helix structure
b. DNA does not form parallel strands by complementary base pairing
Which is not true for RNA:
a. mRNA synthesis is known as translation
b. rRNA is a structural component of the ribosome
c. tRNA is a transport molecule for amino acids
d. mRNA is the template for protein synthesis
e. RNA is single stranded
a. mRNA synthesis is known as transcription NOT translation
What is palmitic acid?
A saturated fatty acid
What is a triglyceride?
A glycerol molecule with three fatty acids joined by ester bonds.
What is linoleic acid?
An essential fatty acid
What is a glycolipid?
An amphipathic constituent of cell membranes.
What is cholesterol?
A four-ring structure which decreases membrane fluidity.
At physiological pH, the R group of Arginine is..?
Charged positive
At physiological pH, the R group of tryptophan is…?
nonpolar
At physiological pH, the R group of Lysine is..?
charged, positive
At physiological pH, the R group of Valine is..?
nonpolar
At physiological pH, the R group of glutamate is..?
Charged, negative
Tyrosine is not..:
a. a precursor of adrenaline
b. a precursor of serotonin
c. present at lower levels than normal in phenylketonuria
d. a precursor of dopamine
e. necessary for skin pigmentation
b. Tyrosine is not a precursor for serotonin.
