Biology Archives

141. The active site of Rubisco is evolved to bind

CO2

Both of these

H2O

✅ The correct answer is option C.

142. Magnifying power of the electron microscope as compared to the eye is

500 X

250000X

500000X

250X

✅ The correct answer is option B.

143. In the case of neurons, post-mitotic cell escapes cell cycle and remain in _______ phase without proliferating further

G0 phase

G1 phase

G2 phase

S phase

✅ The correct answer is option A.

144. Number of spiracles present in a cockroach is

✅ The correct answer is option C.

145. In cell fractionation various components of cells including its organelles can be isolated in different layers depending upon:

Their physical properties like size & weight.

Physical properties of the medium like its density.

Their electrical properties like their charges

Both a and b

✅ The correct answer is option D.

146. Mitosis occurs in

Diploid cells only

Haploid cells only

Both diploid and haploid cells

Monoploid cells

✅ The correct answer is option C.

147. Which of the following plays the major role in providing support to young herbaceous parts of the plant:

Living cells of epidermis with higher turgor pressure.

Living cells of cortex and pith with higher turgor pressure.

Collenchyma cells

All of these

✅ The correct answer is option D.

148. Percentage of proteins in the cell membrane is

20-40%

40-50%

60-80%

80-100%

✅ The correct answer is option C.

149. Microtubules are composed of

Action protein

Actin and myosin proteins

Sphingomyelin and tubulin

Tubulin protein and traces of RNA

✅ The correct answer is option D.

150. Higher turgor pressure in a plant cell is maintained by:

A large number of vacuoles in a plant cell.

Higher ionic concentration inside vacuoles resulting from active pumping of ions at their tonoplastic membrane

A higher osmotic pressure of the cell vacuole

both B and C

✅ The correct answer is option D.