Fill in the blanks with appropriate words:

microscope is used to examine the cell-membrane.

Three-dimensional structure of water, proteins and nucleic acids is maintained by bonding.

Enzymes that are synthesized as their inactive forms are called

is the ultimate electron acceptor in oxidative phosphorylation.

Living, nucleated cells associated with sieve tubes are called cells.

Match the terms given under Column A with those given under Column B

ColumnA ColumnB

Scanning electron microscope Cytokinesis

Endocytosis Cellular movements

Dictyosomes Compound eye of insect

Microfilaments Aggregation in slime moulds

Cyclic-AMP Phagosome

2. Indicate whether the following statements are True or False. Give a brief reason to support your answer. (Attempt any five).

Aerobic bacteria are more primitive than oxygenic photosynthetic organisms.

Limit of resolution of a light microscope decreases as the wavelength of light increases.

When pH of a system increases from 2 to the concentration of doubles.

Transport of molecules in facilitated diffusion does not require ATP.

Proteinaceous, primary messengers enter through cell membrane and activate the enzymes.

4-Dinitrophenol inhibits synthesis of ATP.

3. Write short notes on any two of the following:

Sclerenchyma

Neurotransmitters

Tricarboxylic acid cycle

Describe briefly the structure and function of endoplasmic reticulum.

Explain the effect of temperature and pH on the activity of an enzyme.

Briefly describe the three categories of muscles found in vertebrates.

With the help of suitable diagrams, between distinguish Anaphase-I and Anaphase-II

Discuss the levels of structure of a protein molecule.

Write a note on cytoskeletal system of the cells. What is its significance?