A chemical substance that reacts with enzyme but is not transformed into product and thus blocking active site is called__________?

A. Substrate
B. Co-factor
C. Inhibitor
D. Promotor

Percentage of water in brain cells is_______?

A. 20%
B. 65%
C. 85%
D. 89%

The atoms of different elements combine with each other through ionic or covalent bonding to produce compounds this stable form is called__________?

A. An organ
B. A molecule
C. Tissue
D. Both a and c

Different species of plants and animals living in the same habitat is called ___________?

A. Population
B. Community
C. Biome
D. Habitat

In animals coordination is achieved by means of_________?

A. Respiratory system
B. Nervous system
C. Endocrine system
D. Both b and c

___________ is the potential surce of chemical energy for cellular activities?

A. C-h bond
B. C-o bond
C. C-n bond
D. P-o-c bond

The branch of biology which deals with the study of social behavior and communal life of human beings living in any environment is called________?

A. Environmental biology
B. Social biology
C. Human biology
D. Both b and c

The concept that various organisms dominated this planet during various geological time period and thus placing organisms in a time squence came from the studies by________?

A. Environmental biologist
B. Paleontologist
C. Marine biologist
D. Social biologist

Group of living organisms of the same species living in the same place at the same time is called________?

A. Community
B. Population
C. Ecosystem
D. Biome

The experiments on DNA molecules in chromosomes for knowing the basis of inherited diseases are conducted by________?

A. Molecular biologists
B. Microbiologists
C. Freshwater biologists
D. Social biologist