Chemistry : Biomolecules

Lactose is made of

• α-D-glucose only

• α-D-glucose and  β-D-glucose 

• α-D-galactose and β-D-glucose

• β-D-galactose and β-D-glucose

Which set is the correct pairing set (or contains complementary pairs) responsible for the structure of DNA ? (A-adenine, G-guanine, C-cytosine, T-thymine, U-uracil)

• A-T, G-C

• A-C, G-T

• A-G, C-T

• A-U, G-C

The effciency of enzyme catalysis is due to its capacity to

• form a strong enzyme-substrate complex

• chage the shape of the substrate

• lower the activation energy of the reaction

• form a colloidal solution in water

Which of the following bases is not present in DNA?

• Uracil

• Adenine

• Thymine

• Guanine

Which one of the following is a non-steroidal hormone?

• Estradiol

• Prostaglandin

• Progesterone

• Estrone

Match the vitamin of column I with deficiency disease given in column II

• A - 3; B - 4; C - 5; D - 2; E - 1

• A - 3; B - 4; C - 5; D - 1; E - 2

• A - 3; B - 5; C - 4; D - 1; E - 2

• A - 3; B - 5; C - 4; D - 2; E - 1

In biological systems, the RNA molecules direct the synthesis of specific proteins which are characteristic of each kind of organism. This process is known is

• transcription

• mutation

• replication

• translation

α and β glucose differ in the orientation of -OH group around:

• C₁

• C₂

• C₃

• C₄

α-helix is found in :

• DNA

• RNA

• Lipid

• Protein

Which of the following hexoses will form the same osazone when treated with excess phenyl hydrazine?

• D-glucose, D-fructose and D-galactose

• D-glucose, D-fructose and D-mannose

• D-glucose, D-mannose and D-galactose

• D-fructose, D-mannose and D-galactose