Questions
Which of the following classes of compounds have their molecular weights not exceeding 800 daltons?
- Proteins
- Nucleic acids
- Polysaccharides
- Lipids
- None of these
Which of the following elements is found in negligible percentage of the weight of the human body?
- Nitrogen
- Carbon
- Silicon
- Hydrogen
- Calcium
Proteins are linear chains of amino acids. Which of the following proteins enables glucose transport into the cells?
- Collagen
- GLUT-4
- Trypsin
- Insulin
- None of these
Alkaloids are called secondary metabolites. Which of the following is an alkaloid?
- Lemon grass oil
- Diterpene
- Cellilose
- Ricin
- Codeine
Match the following:
| a. Acidic amino acid | 1. Lysine |
| b. Basic amino acid | 2. Valine |
| c. Neutral amino acid | 3. Glutamic acid |
- a - 3, b - 1, c - 2
- a - 3, b - 2, c - 1
- a - 1, b - 2, c - 3
- a - 1, b - 3, c - 2
- a - 2, b - 1, c - 3
Arthropods exoskeletons have a complex polysaccharide. Which of the following is that polysaccharide?
- Glucosamine
- N-acetyl galactosamine
- Cellulose
- Inulin
- Chitin
Which of the following is/are not example(s) of metabolic transformations?
a. Removal of CO2 from amino acids making an amino acid into an amide.
b. Removal of amino group in a nucleotide base.
c. Hydrolysis of a glycosidic bond in a disaccharide.
- Only a
- Only a and b
- Only b
- Only b and c
- Only c
Which of the following is not an example of nucleotides?
- Adenylic acid
- Thymidylic acid
- Guanylic acid
- Cytidine
- Uridylic acid
On an average, which of the following components has/have the least percentage of the total cellular mass in a cell of a living organism?
- Ions
- Water
- Nucleic acids
- Carbohydrates
- Proteins
Which of the following statements is/are false?
a. An enzyme like any protein has a primary structure.
b. There are some ribosomes that behave like enzymes and they are called ribozymes.
c. Catabolic pathways lead to the release of energy.
- Only a
- Only a and b
- Only b
- Only b and c
- Only c
Which of the following is formed in our skeletal muscles under anaerobic conditions?
- Lactic acid
- Ethanol
- Pyruvic acid
- Carbonic anhydrase
- Amylase
Which of the following conditions can not affect the activities of an enzyme?
a. Concentration of substrate
b. pH
c. Humidity
- Only a
- Only a and b
- Only b
- Only b and c
- Only c
Which of the following is the correct sequence of steps involved in the catalytic cycle of an enzyme?
a. The enzyme releases the products of the reaction and the free enzyme is ready to bind to another molecule of the substrate.
b. The substrate binds to the active site of the enzyme, fitting into the active site.
c. The active site of the enzyme breaks the chemical bonds of the substrate and the new enzyme-product complex is formed.
d. The binding of the substrate induces the enzyme to alter its shape, fitting more tightly around the substrate.
- b - d - a - c
- b - c - d - a
- d - b - c - a
- b - d - c - a
- a - d - c - b
Match the following:
| a. Prosthetic groups | 1. They form coordination bonds with side chains at the active site and also form one or more coordination bonds with the substrate. |
| b. Co-enzymes | 2. They are organic compounds, but their association with the apoenzyme usually occurs during the course of catalysis. |
| c. Metal ions | 3. They are organic compounds that are tightly bound to the apoenzyme. |
- a - 3, b - 2, c - 1
- a - 3, b - 1, c - 2
- a - 1, b - 3, c - 2
- a - 2, b - 3, c - 1
- a - 1, b - 2, c - 3
Which of the following are substituted purines?
a. Adenine
b. Uracil
c. Guanine
d. Cytosine
- Only a and b
- Only a and c
- Only a and d
- Only b and c
- Only b and d