Answer the following statements true (T) or false (F)
1. Catabolic and anabolic reactions in living cells involve the transfer of electrons from one molecule to another in reduction-oxidation reactions.
2. Metabolism reflects only those reactions that yield energy.
3. The half-life of a molecule is the time it takes for 50% of the molecule to be broken down and recycled.
4. Autophagy is an important process that removes worn-out organelles, recycles components, then release them into the cytosol.
1. TRUE
2. FALSE
3. TRUE
4. TRUE
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Viral size is generally measured in
A) micrometers. B) picometers. C) nanometers. D) centimeters.
The ________ is the tube that conducts sperm from the epididymis to the urethra
Fill in the blank(s) with correct word
Which of the following illustrates a negative feedback mechanism that occurs in the human body?
a) the release of insulin from the pancreas in response to an increase in blood sugar levels b) the release of glucagon from the pancreas in response to an increase in blood- sugar levels c) the release of oxytocin resulting in uterine contractions as childbirth is underway d) chemical reactions that result in coagulation due to fibrin being released
Antigens are
A. nonself proteins. B. proteins on the surface of B-cell membranes. C. proteins on the surface of macrophage membranes. D. proteins that consist of two light and two heavy chain polypeptide chains. E. proteins on the surface of T-cell membranes.