Why is the proteome larger than the genome?
A. Proteins may be modified by covalent addition of a variety of molecules
B. Not all genes are expressed in all cells at the same time
C. Each gene will produce multiple mRNAs which will produce multiple proteins so the ratio of the number of protein molecules the number of genes is greater than
A
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Imagine you are entering a darkened cavern. You are excited, but also a little nervous. Your heart rate quickens, your blood pressure rises slightly, and your digestive system activity decreases as blood is diverted to your muscles—all changes that prepare you should you need to move rapidly. This type of change is an example of
A. positive feedback control. B. negative feedback control. C. a failure of homeostasis. D. feedforward regulation. E. open loop feedback.
Chloe has the scaly skin condition icthyosis, which is X-linked recessive. Which of the following is most likely true?
A) Her mother and father were both unaffected carriers. B) Her mother was affected and her father was unaffected. C) Her father was a carrier. D) Her mother was a carrier and her father was affected.
Into what type of energy does the process of photosynthesis transform solar energy?
A) chemical B) mechanical C) heat D) kinetic
Oxygen gas produced during photosynthesis originates as:
a) oxygen atoms contained in water molecules. b) oxygen atoms from a molecule of chlorophyll that is oxidized by a photon. c) oxygen atoms released by the metabolism of carbohydrates. d) oxygen molecules in the atmosphere. e) oxygen atoms contained in carbon dioxide are released when the carbon is fixed.