Diversity Living World - Questions & Answers | Exam2Win

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136. A major regulator mechanism for multistep reactions is

A. Presence of inhibitors

B. Availability of activators

C. Feed-back mechanism

D. All the above

Explanation:

137. Anabolism is

A. Sum total of metabolic reactions

B. Destructive metabolism

C. Constructive metabolism

D. Glycogenolysis

Explanation:

138. Homeostasis is

A. Maintenance of dynamic constancy of internal environment

B. Maintenance of static constancy of internal environment

C. Maintaining favourable internal environment despite changes in external environment

D. Both A and C

Explanation:

139. If the external temperature is low

A. Warm receptors are activated

B. Cold receptors are inhibited

C. Thermostat becomes operational ordering vasoconstriction of peripheral vessels and stimulation of skeletal muscles

D. Thermostat becomes operational ordering vasodilation of peripheral vessels and activation of sweat glands

Explanation:

140. Allosteric sites are of

A. One type

B. Two types

C. Three types

D. Four types

Explanation: