In competitive inhibition:
(1) Inhibitor resembles the substrate in molecular structure
(2) Competition between substrates and inhibitors to occupy active sites
(3) Binding the inhibitors to activities sites declines the enzyme action
(4) All are correct
A. Catalyses the transfer of a group (other than hydrogen).
B. Catalyses removal group from substrates by mechanism other than hydrolysis leaving double bond
C. Catalyzing the linking of 2 molecules by using energy into one molecule.
Identify the classes of enzymes for above functions:
A | B | C | |
(1) | Ligase | Lyase | Transferase |
(2) | Transferase | Lyase | Ligase |
(3) | Lyase | Ligase | Transferase |
(4) | Transferase | Ligase | Lyase |
Which of the following statements about enzymes is true?
1. Enzymes do not alter the overall change in free energy for a reaction
2. Enzymes are proteins whose three dimensional shape is key to their functions
3. Enzymes speed up reactions by lowering activation energy
4. Enzyme are highly specific for reactions
5. An enzyme like any protein has the secondary and tertiary structure.
6. The energy input needed to start a chemical reaction is called activation energy
(1) All are correct
(2) All except 5
(3) 5 and 6
(4) 2 and 4
Go through the following statements-
A. Primary metabolites are biochemicals formed as intermediates and products of normal vital metabolic pathways of organisms
B. Plant tissues produce only secondary metabolites
C. Secondary metabolites have restricted distribution in the plant kingdoms only.
D. Secondary metabolites are derivatives of primary metabolites.
E. Many plants, fungi and microbes synthesise secondary metabolites.
F. No secondary metabolite has ecological importance.
G. We understand the role of all secondary metabolites in the host organisms.
H. Many secondary metabolites are of economic importance to us.
Which of the above statement are wrong?
(1) A, B, C are wrong
(2) D, E, F are wrong
(3) A, D, E are wrong
(4) B, C, F, G are wrong
Which one of the following is the diagrammatic representation of a nucleotide?
(a) (b)
(c)
(d)
The above diagram represent the nitrogenous bases. Identify the correct combination:
(1) A = Adenine; B = Thymine
(2) A = Guanine; B = Thymine
(3) A = Adenine; B = Uracil
(4) A = Guanine; B = Uracil
Which one is false?
(1) Fatty acids may be unsaturated (with one or more C = C bonds) or a saturated (without double bonds)
(2) Fatty acid(s) may be esterified with glycerol forming monoglyceride, diglyceride and then triglyceride
(3) Some tissues especially neural tissues have lipids with very simple structures
(4) Fats and oils are triglycerides
Adult human haemoglobin consists of:
(1) 2 subunits (β, β)
(2) 2 subunits (α, α)
(3) 4 subunits (2α, 2β)
(4) 3 subunits (2α, 1β)
The quaternary structure of a protein:
(1) Consists of 4 subunits - hence the name quaternary
(2) Is unrelated to the function of the protein
(3) Both (a) and (b)
(4) Depends on the 1° structure of subunits
In a normal adult, ascending order of concentration of following molecules is
(1) K>Na>Fe>Cu
(2) Na>K>Cu>Fe
(3) Fe>Na>K>Cu
(4) Na>Fe>K>Cu