Why was protein originally thought to be the genetic information storage molecule instead of DNA?
A. There are more building blocks for protein than there are for DNA.
B. Proteins have a wider variety of three- dimensional shapes than DNA.
C. Proteins carry out a great range of cellular functions.
D. there are more building blocks for protein than there are for DNA, proteins have a wider variety of three-dimensional shapes than DNA, and proteins carry out a great range of cellular functions
Answer D
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Which of the following is needed directly to produce both triose phosphates and RuBP?
A. Rubisco B. NADPH C. ATP D. O2 E. PSII
The main effect of burning peat, wood, coal, and petroleum on the Earth's climate is:
A. The fires significantly heat the air and cause a rise in global temperature. B. The smoke blocks sunlight from reaching the Earth and causes a significant lowering of the Earth's temperature. C. The fires release back into the atmosphere carbon dioxide that was once taken from the atmosphere by plants and stored in their own tissues; the increased carbon dioxide holds in solar heat and causes a rise in temperature. D. The rising heat from fires produces wind that cools the surface of the Earth. E. The fires use up oxygen that would otherwise block penetration of ultraviolet light from reaching the Earth; the increased ultraviolet radiation heats the Earth.
Eukaryotic ribosomes may be free in the cytoplasm or attached to the ________ ________.
What will be an ideal response?
Connor decides to celebrate his 21st birthday by drinking a few beers at a local sports bar. After a while, Connor notices that he is making many more trips to the men's room than the week before when he drank similar amounts of carbonated water. Why is that?
A. Alcohol inhibits reabsorption of sugars, amino acids and other small metabolites, which decreases reabsorption of water. B. Alcohol stimulates secretion of ions into the nephron and water follows by osmosis. C. Alcohol inhibits the secretion of ADH by the posterior pituitary gland, thereby decreasing water reabsorption. D. Alcohol stimulates filtration of the blood plasma by the glomeruli. E. Alcohol stimulates the insertion of aquaporins into the plasma membranes of cells that line the collecting ducts, thereby decreasing water reabsorption.