Question

question4.

Which of the following statements describes the thermic effect of foods (TEF)?

a. A meal eaten all at once has a lower TEF than one spread out over hours.

b. TEF must be considered when estimating energy expenditure because its contribution to total energy output is substantial.

c. TEF plus an increase in the metabolic rate due to overeating is called diet-induced thermogenesis (DIT).

d. TEF is higher for high-fat foods than for high-carbohydrate foods.

e. TEF is estimated at 25% of energy intake.

question 29

Which digestive enzyme hydrolyzes protein in the stomach?

a. Chymotrypsin

b. Elastase

c. Pepsin

d. Enteropeptidase

e. Trypsin

question 30 . Enzymes that hydrolyze protein are called ________.

a. sequencers

b. proteases

c. transcriptors

d. bases

e. naturalizers

31. Intestinal tripeptidases cleave ________.

a. tripeptides

b. polypeptides

c. amino acids

d. oligopeptides

e. dipeptides

32. What happens when pepsin enters the small intestine?

a. It is digested due to the high pH.

b. It activates HCl.

c. It denatures protein structures.

d. It cleaves proteins into smaller peptides and some free amino acids.

e. It inhibits pepsinogen synthesis.

question 33.

Ribosome is composed of RNA and protein and can be thought of as ________.

a. a protein transportation machine

b. a protein-making machine

c. an immune booster

d. a template for protein synthesis

e. a protein pool

31. Intestinal tripeptidases cleave ________.

a. tripeptides

b. polypeptides

c. amino acids

d. oligopeptides

e. dipeptides

Answer 1

4. b.

It is important to consider TEF in energy expenditure because it contributes to 10% of the energy consumed on an average. It is substantial amount of energy. TEF is highest for proteins, followed by carbohydrates and least for fats. Frequency of meal consumption has negligible effect on TEF as long as calories and composition of food remains same in a day. TEF and DIT are same.

29. c. pepsin

This is the active stomach enzyme which helps in break down of proteins ingested through food.

30. b. proteases

These are chemical substances that digest and breakdown the proteins by hydrolysing the bonds between amino acids.

31. a. tripeptides

These intestinal tripeptidases cleave and digest tripeptides. This is why they got the name tripeptidases. They break these trimers of amino acids into simpler compounds.

32. a. It is digested due to high pH

This is because pepsin is active only in acidic pH. The small intestine is neural to basic. The pepsin is not functional and becomes inactive at this pH. So it is eventually digested in the intestine.

33. b. a protein making machine

The ribosomes can be called so because they are the ones that binds two amino acids and form a polypeptide chain. These are proteins. The ribosomes form integral part of cellular functioning as proteins are essential for various life purposes in the cells.

This is a brief discussion on the given topics. Hope this helps you out. Please feel free to give a like and contact us if you need further detail explanation on any of these topics. Thank you and have a great day.