Ribosomes are particles about 200 Å units in diameter consisting of protein and RNA. The percentage of protein and RNA is respectively

• 80% and 20%

• 60% and 40%

• 50% and 50%

• 40% and 60%

Keeping is viewed the structure of cell membrane, which one of the following statements is correct with respect to the movements of liquid and proteins from one liquid monolayer to the other (flip-flop movement).

• While proteins can flip flop, liquids can not

• Neither lipids, nor proteins can flip flop

• Both lipids and proteins can flip flop

• While lipids can rarely flip-flop, proteins can not

Match the biological molecule listed under column I with their biological function listed under column II. Choose the answer which gives correct combination of alphabet of the two columns.

• A-3, B-2, C-4, D-1

• A-4, B-2, C-1, D-3

• A-2, B-4, C-3, D-1

• A-4, B-3, C-1, D-2

Which of the following characteristics out of I, II and III are exhibited by C₄ plants?

I. Kranz anatomy.

II. The product of photosynthesis is oxalo acetic acid.

III. Both PEP carboxylase and ribulose-bis phosphate carboxylase act as carboxylating enzyme.

Choose the correct option.

• I and II, but not III

• II and III, but not I

• I and III, but not II

• All of these

Compare the statements I and II and choose the correct option.

Statement (I) Auxin promotes apical dominance by suppressing the activity of lateral buds.

Statement (II) In moriculture, periodic pruning of shoot tips is done to make mulberry plants bushy.

Choose the correct options

•  I is false, but II is true

• II is false, but I is true

• Both I and II are true

• Both I and II are false

Chlorosis is produced in the leaves due to the deficiency of Fe, Mg, Mn, S or N of these essential elements, those that are exclusive constituents of chlorophyll molecule are

• Fe, S

• N,S

• Mg, S

• Mg, N

 Match the following column I and II for organismic respiration.

•  A-2, B-3, C-1

• A-3, B-2, C-1

• A-1, B-3, C-2

• A-3, B-1, C-2

Haldane effect refers to

• More acidity in the blood

• Less acidity in the blood

• More basicity in the blood

• Less basicity in the blood

In coconut, the liquid endosperm is formed because

• Karyokinesis is not followed by cytokinesis

• Karyokinesis is followed by cytokinesis

• Formation of the liquid endosperm is not dependent upon karyokinesis and cytokinesis

•  None of the above

Read the following statements and choose the correct option.

I. Leptosporangiate development of sporangium is found in all membersPteropsida.

II. Seed habit is shown by sellaginella.

III. Gnetum leaves are monomorphic and pinnately compound.

IV. Sporic meiosis is found in Volvolx, Chalmydomonas and Ulothrix.

Choose the correct option.

• I and IV

• I and II

• I, II and IV

• All of these