Which of the following statements about enzymes is/ are correct?
They are biocatalysts.
They perform their action on the site where they are produced.
Select the correct answer from the codes given below:
Codes:
Correct Answer:
(C)
Both 1 and 2
Enzymes can be defined as biological polymers that catalyze biochemical reactions. Thus, they are biocatalysts and accelerate chemical reactions in the human body. Generally, enzymes perform their action on the site where they are produced. Hence, both statements are correct.
Ques:
12
Digestion of Lipids takes place in the presence of some of the following:
1. Bile acids 2. Lipase
3. Pepsin
of these, which are correct?
Correct Answer:
(C)
Only 1 and 2 are correct
Most of the lipids in our food are present in the form of simple fats or triglycerides. Lipase enzyme plays an important role in the digestion of Lipids. Lipase breaks down lipids into fatty acids and monoglycerides. Bile probably contains no digestive enzyme, yet it plays an important role in the digestion and absorption of fat. It facilitates emulsification of fats. Pepsin is a protein digesting or proteolytic enzyme.
Ques:
13
The source of the enzyme ‘lipase’ is:
Correct Answer:
(B)
Pancreas
The enzyme ‘lipase’ is produced in the pancreas, mouth and stomach. It is a fat hydrolyzing enzyme. Its function is to digest fats and lipids, helping to maintain correct gallbladder function.
Ques:
14
Consider the following statements:
Assertion (A) : All the proteins in our food are digested in small intestine only.
Reason (R) : The protein-digesting enzyme from the pancreas are released into the small intestine.
Code:
(A) and (R) are individually true and (R) is the correct explanation of
(A).
Correct Answer:
(D)
is false, but (R) is true.
Protein digestion begins in the stomach with the action of an enzyme called pepsin. Pepsin is the active protein digesting enzyme of the stomach. Protein - digesting enzyme trypsin is produced in an inactivate form in the pancreas and is activated in the small intestine, where it digests protein. Duodenum is the first and shortest segment of the small intestine. In the duodenum, trypsin catalyzes the hydrolysis of peptide bonds, breaking down proteins into smaller peptides. Enzymes continue to break down polypeptides and peptides into amino acids. As amino acids are very small, they are able to be absorbed through the small intestine lining and into the bloodstream.
Ques:
15
Which of the following changes is catalyzed by the enzyme trypsin?
Correct Answer:
(C)
Proteins to amino acids
In the duodenum, trypsin catalyzes the hydrolysis of peptide bonds, breaking down proteins into smaller peptides. The peptide products are then further hydrolyzed into amino acids via other proteases, rendering them available for absorption into the bloodstream.
Ques:
16
In the human body, which structure is the appendix attached to?
Correct Answer:
(A)
The large intestine
The appendix is a blind-ended tube connected to the caecum, that is considered to be the beginning of the large intestine from which it develops embryologically. The caecum is a pouch-like structure of the colon, located at the junction of the small and the large intestines.
Ques:
17
Body temperature is regulated by
Correct Answer:
(B)
hypothalamus
The average normal temperature of the human body is 98.6º F. The hypothalamus controls body temperature. It also controls hunger, important aspects of parenting and attachment behaviours, thirst, fatigue, sleep and circadian rhythms.
Ques:
18
The temperature of the human body?
Correct Answer:
(C)
Neither decreases in winters nor increases in summers
The temperature of the human body neither decreases in winters nor increases in summers. The usual temperature of the human body is 98.6°F or 37°C and is controlled by the hypothalamus in the brain. The hypothalamus functions as a type of thermostat for the body.
Ques:
19
The temperature of a normal human body is –
Correct Answer:
(D)
None of the above
The average of normal temperature of human body is 98.6oF (37o C or 310º K).
Ques:
20
Corpus luteum is a mass of cells found in:
Correct Answer:
(B)
Ovary
The corpus luteum is a temporary endocrine structure in female ovaries. It is involved in the production of relatively high levels of progesterone and moderate levels of estradiol and inhibin A. The corpus luteum develops from an ovarian follicle during the luteal phase of the menstrual cycle or estrous cycle following the release of a secondary oocyte from the follicle during ovulation. Its cell develops from the follicular cells surrounding the ovarian follicle.