#Question id: 1520
#Unit 4. Cell Communication and Cell Signaling
Following statements are regarding to enzymatic processing of benzo(a)pyrene to a more potent mutagen and carcinogen.
A. Liver enzymes, particularly P-450 enzymes, modify benzo(a)pyrene in a series of reactions, producing 7,8-diol-9,10-epoxide, a highly potent mutagenic species that reacts with DNA primarily at the N2 atom of a guanine base.
B. The adduct, (+)-trans-anti-B(a)P-N2-dG, causes polymerase to insert an A rather than a C opposite the modified G base. Next time the DNA is replicated, a T will be inserted opposite the A, and the mutation will be complete.
C. Potent mutagen majorly causes conversion of guanine (G) to thymine (T) bases, a transition mutation.
D. When this potent mutagen applied to cultured bronchial epithelial cells, activated benzo(a)pyrene induces many mutations, including activating mutations at codons 175, 248, and 273 of the p53 gene.
Which of the following statements are correct?
#Question id: 28745
#Unit 2. Cellular Organization
Where does beta-oxidation also known as fatty acid breakdown occur in case of plant cell?
#Question id: 12705
#Unit 8. Inheritance Biology
#Question id: 10807
#Unit 6. System Physiology – Plant
Cyanogenic Glycosides and Glucosinolates are nitrogen
containing secondary metabolites in plants. Following are some statements
regarding the action of Cyanogenic Glycosides and Glucosinolates;
a) Cyanogenic Glycosides release the poison hydrogen
cyanide by the action of enzyme known as Hydroxynitrile lyase
b) Release of the mustard-smelling volatiles from
glucosinolates is catalyzed by a hydrolytic enzyme, called a thioglucosidase or
myrosinase
c) substerate for Glycosidase is Cyanogenic glycoside
and Thioglucosidase is Aglycone
d) Like cyanogenic glycosides, glucosinolates are
stored in the intact plant separately from the enzymes that hydrolyze them, and
they are brought into contact with these enzymes only when the plant is crushed
Which of the following combinations of above statement is true?
#Question id: 19788
#Unit 13. Methods in Biology