AP BIOLOGY

CELL RESPIRATION

OXIDATIVE PHOSPHORYLATION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
In vertebrate animals, brown fat tissue’s color is due to abundant mitochondria. White fat tissue, on the other hand, is specialized for fat storage and contains relatively few mitochondria. Brown fat cells have a specialized protein that dissipates the proton-motive force across the mitochondrial membranes. Which of the following might be the function of the brown fat tissue?
A
to increase the rate of oxidative phosphorylation from its few mitochondria
B
to allow the animals to regulate their metabolic rate when it is especially hot
C
to allow other membranes of the cell to perform mitochondrial function
D
to regulate temperature by converting energy from NADH oxidation to heat
Explanation: 

Detailed explanation-1: -In vertebrate animals, brown fat tissue’s color is due to abundant blood vessels and capillaries.

Detailed explanation-2: -Brown fat breaks down blood sugar (glucose) and fat molecules to create heat and help maintain body temperature. Cold temperatures activate brown fat, which leads to various metabolic changes in the body. Most of our fat, however, is white fat, which stores extra energy.

Detailed explanation-3: -How do the mitochondria of brown fat cells differ from those of other cells? Ion channels in the inner mitochondrial membrane prevent the formation of a H+ gradient.

Detailed explanation-4: -Brown adipose tissue (BAT) is a unique thermogenic tissue in mammals that rapidly produces heat via nonshivering thermogenesis. Small mammalian hibernators have evolved the greatest capacity for BAT because they use it to rewarm from hypothermic torpor numerous times throughout the hibernation season.

Detailed explanation-5: -Brown fat cells have a specialized protein that dissipates the protein-motive force across the mitochondrial membranes. Which of the following might be the function of the brown fat tissue? To regulate temperature by converting most of the energy from NADH oxidation to heat.

There is 1 question to complete.