Biomolecules Exam Questions Flashcards

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1
Q

Niacin is a:

a. nucleotide
b. steroid
c. carbohydrate
d. vitamin
e. nucleoside

A

d. Niacin is a vitamin

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2
Q

Fructose is a:

a. lipid
b. co-factor
c. carbohydrate
d. vitamin
e. nucleoside

A

c. fructose is a carbohydrate

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3
Q

What type of biomolecule is co-enzyme A?

A

Co-factor

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4
Q

What type of biomolecule is stearate?

A

Stearate is a lipid

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5
Q

What type of molecule is adenosine triphosphate?

A

A nucleotide

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6
Q

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

A

c. Carbohydrates can not provide energy directly for cellular processes.

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7
Q

Labelling of hexose sugars

A

Hexoses are labelled alpha when the OH group falls below the anomeric carbon.

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8
Q

What is sucrose?

A

A disaccharide of glucose and fructose.

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9
Q

What is galactose?

A

A monosaccharide.

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10
Q

What is glycogen?

A

A glucose polymer - alpha 1 to 4 glycosidic bonds with alpha 1-6 branches.

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11
Q

What is maltose?

A
A disaccharide of two glucose monomers.
Glucosyl alpha(1>4) glucose.
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12
Q

What is amylose?

A

Linear glucose polymer with alpha glycosidic bonds

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13
Q

Which enzyme is deficient in lactose intolerance?

A

beta-galactosidase

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14
Q

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

A

b. DNA does not form parallel strands by complementary base pairing

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15
Q

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

a. mRNA synthesis is known as transcription NOT translation

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16
Q

What is palmitic acid?

A

A saturated fatty acid

17
Q

What is a triglyceride?

A

A glycerol molecule with three fatty acids joined by ester bonds.

18
Q

What is linoleic acid?

A

An essential fatty acid

19
Q

What is a glycolipid?

A

An amphipathic constituent of cell membranes.

20
Q

What is cholesterol?

A

A four-ring structure which decreases membrane fluidity.

21
Q

At physiological pH, the R group of Arginine is..?

A

Charged positive

22
Q

At physiological pH, the R group of tryptophan is…?

A

nonpolar

23
Q

At physiological pH, the R group of Lysine is..?

A

charged, positive

24
Q

At physiological pH, the R group of Valine is..?

A

nonpolar

25
Q

At physiological pH, the R group of glutamate is..?

A

Charged, negative

26
Q

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

A

b. Tyrosine is not a precursor for serotonin.