Which of the following tissues consist of living cells?

• Vessels

• Tracheids

• Companion cell

• Sclerenchyma

Which of the following plant cells is not surrounded by a cell wall?

• Root hair cell

• Stem hair cell

• Gamete cell

• Bacterial cell

Which of the following cell organelles stores hydrolytic enzymes?

• Centriole

• Lysosome

• Chromoplast

• Chloroplast

The thickness of unit membrane is

• 20 A^o

• 35 A^o

• 55 A^o

• 75 A^o

The powerhouse of cells is first discovered by

•  C Benda in 1897

•  Kolliker in 1850

• Claude in 1880

• Kingsburg in 1882

During chloride shift or Hamburger phenomenon, when the whole blood is saturated with CO₂, following changes occurs. Which one of them is not correct?

• Bicarbonate content of plasma and corpuscles increase

• Chloride content of plasma diminished and that of the cell is increased

• Total base of blood remain unchanged

• Water content and volume of corpuscles decrease

The Sub-units of 80S ribosome will be

• 40S, 40S

•  60S, 40S

• 60S, 20S

• 55S, 25S

 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

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%

Which of the following sequences represent a possible pathway in the production of a secretory protein?

• Rough ER → Secretory vesicle → Ribosome → Golgi apparatus

• Ribosome → Rough ER → Golgi apparatus → Secretory vesicle

• Secretory vesicle → Golgi apparatus → Ribosomes → Rough ER

• Rough ER → Ribosomes → Secretory vesicles → Golgi appratus