Question

What is the purpose of uncoupling proteins in mammalian brown adipose tissue?

A. They give the tissue its color.

B. They help the tissue expand and contract when needed.

C. They function as a source of heat production during exposure to cold temperatures.

D. They allow the production of a larger number of ATPs per glucose.

Answer 1

The purpose of uncoupling proteins in mammalian brown adipose tissue

       

Option A: incorrect

1. They give the tissue its color.

Reason: the color of the tissue is provided by the small lipid molecules and high iron content that provides these tissues dark red to tan color and not by the uncoupling proteins.

Option B: incorrect

2. They help the tissue expand and contract when needed.

Reason: The high elasticity and plasticity can be seen in adipose tissues for the purpose of contraction and expansion to meet the energy demands of energy but, this is not accomplished by uncoupling proteins.

Option C: correct

3. They function as a source of heat production during exposure to cold temperatures.

Reason: yes, the uncoupling proteins are called thermogenin because of its function as a proton carrier which allows the heat dissipation due to generated proton gradient. This is generated via the respiratory chain and that uncouples the process of oxidative phosphorylation. The regulation of heat production is controlled by uncoupling [proteins and its analogous proteins that form the strategies to work on against obesity.

Option D: incorrect

4. They allow the production of a larger number of ATPs per glucose.

Reason: Body heat production is mediated by the signaling mechanism of mitochondria. This allows proton to revert back along the gradient and it does not produce ATP (also called proton leak). So, the production of a large amount of ATP does not take place.