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WorksheetsPROTEINS
Total questions: 25
Worksheet time: 18mins
Proteins are the most abundant bioorganic substance. The presence of _________ in proteins sets them apart from carbohydrates and lipids.
Carbon
Hydrogen
Oxygen
Nitrogen
Building blocks of proteins (*ANSWER IN ALL CAPITAL LETTERS*)
(a)
Which of the following is/are Polar Neutral Amino Acid/s
Glutamine
Leucine
Glutamic acid
Cysteine
Lysine
Histidine, Lysine, and Arginine are examples of ____________________.
Non-polar AA
Polar Neutral AA
Polar Acidic AA
Polar Basic AA
A polar acidic amino acid is an amino acid that contains a ____________ as its side chain.
non polar
neutral
second carboxyl group
second amino group
An essential amino acid that is required for growth in children but not in adults.
(a)
Chirality can be observed in 19 out of 20 standard amino acids. Glycine is an exception as it has another hydrogen atom as its side chain.
First statement is correct. Second statement is incorrect.
First statement is incorrect. Second statement is correct.
Both statements are correct.
Both statements are incorrect.
Naturally occurring amino acids are ______________.
D-isomers
L-isomers
In the Fischer projection formula for amino acids, the D- and L- isomer is identified based on the horizontal position of ____________.
Hydrogen
Amino group
Carboxyl group
Side chain
In neutral solution, carboxyl groups tend to be protonated. On the other hand, amino groups tend to be deprotonated.
First statement is correct. Second statement is incorrect.
First statement is incorrect. Second statement is correct.
Both statements are correct.
Both statements are incorrect.
A molecule that has a positive charge on one atom and a negative charge on another atom, but which has no net charge.
(a)
In acid solution, amino and carboxyl groups_______________
are protonated
are deprotonated
does not have a charge
The pH at which an amino acid solution has no net charge because an equal number of positive and negative charges are present. (*ANSWER IN ALL CAPITAL LETTERS)
(a)
During electrophoresis, amino acids that has a negative net charge will ____________________.
migrate towards the positive electrode
migrate towards the negative electrode
not migrate
The only standard amino acid that has a sulfhydryl group side chain.
(a)
The formation of Cystine from cysteine is reversible.
True
False
Small peptide hormone that regulates the excretion of water by the kidneys.
Oxytocin
Vasopressin
Enkephalin
Glutathione
Which of the following conjugated proteins is/are classified as glycoproteins?
Hemoglobin
Gamma globulin
Ferritin
Mucin
High-density lipoproteins
The strongest of the tertiary-structure interactions
Covalent disulfide bonds
Salt bridges
Hydrogen bonds
Hydrophobic attractions
Which interactions responsible for tertiary structure are easily disrupted by changes in pH and temperature?
Covalent disulfide bonds
Salt bridges
Hydrogen bonds
Hydrophobic attractions
Hemoglobin is a protein that has a _____________ structure.
Primary
Secondary
Tertiary
Quaternary
True about fibrous proteins (Select all that applies)
Water soluble
Water insoluble
Have structural function
Have a single type secondary structure
A globular protein that functions as oxygen storage in muscles.
(a)
Reverse formation reaction for a peptide bond.
Hydrolysis
Denaturation
Oxidation
Their function is to transport dietary triacylglycerols from the intestine to the liver and to adipose tissue.
VLDL
LDL
HDL
Chylomicrons
