A certain reaction pathway consists of four steps. How would increasing the amount of enzyme that catalyzes in the third step affect the amount of product produced at the end of the pathway?
What will be an ideal response?
Increasing the amount of enzyme at the third step might not affect the whole series of reactions because the rate of the first, second, and fourth enzymes would remain the same. While more substrate would be available for the next step, that doesn't necessarily mean that the fourth enzyme will increase its speed. The net result would be no change if the first, second, and fourth enzymes were working optimally before the change is made. On the other hand, there could be an increase in the amount of product if the first, second, and fourth enzymes were working at below optimum before the change.
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Each of the following is true of the pineal gland except that it
A) is a component of the epithalamus. B) is a component of the hypothalamus. C) secretes melatonin. D) contains pinealocytes. E) responds to light and darkness.
The anorectal flexure of the anal canal:
A) occurs at the level of S3. B) is maintained by the transverse rectal folds. C) is where the alimentary tract penetrates the pelvic diaphragm. D) is within the rectovesical pouch. E) is where the omental appendices cease.
Define scavenging system
What will be an ideal response?
Which of the following is characteristic of carbohydrates?
A) all of the above. B) They contain C, H, O, with twice as many hydrogen as oxygen atoms. C) They provide much of the energy that the cell requires. D) They include sugars and starches.