How is bacterial DNA packaged?
A) in a lattice along the capsule's inner wall
B) in the nucleus as a chromosome
C) at the center of the cell in a chromosome
D) in dozens of small fragment at the center of the cell
Ans: C) at the center of the cell in a chromosome
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Astronauts who spend significant time at zero gravity often become somewhat anemic upon return to Earth. One way to compensate for the process that leads to this anemia might be to supply the astronauts with ________ during the mission in space
a. a diet higher in protein and iron b. a diuretic, which will cause them to excrete more fluid c. a growth factor that leads to increased red blood cell production d. higher levels of oxygen in the shuttle atmosphere e. more opportunities to rest or sleep
A biome is
A) the thin layer surrounding the Earth that supports all life. B) all the populations of different species living and interacting within an ecosystem. C) a broad-scale region dominated by similar types of ecosystems. D) an area of land or water composed of a patchwork of communities and ecosystems.
Each renal calyx
A. is a funnel-shaped structure. B. surrounds the tip of a renal pyramid. C. joins to form the renal pelvis. D. has all of these characteristics. E. has none of these characteristics.
The first energy-generating steps in glycolysis begin when glyceraldehyde 3-phosphate undergoes an energetically favorable reaction in which it is simultaneously oxidized and phosphorylated by the enzyme glyceraldehyde 3-phosphate dehydrogenase to
form 1,3-bisphosphoglycerate, with the accompanying conversion of NAD+ to NADH. In a second energetically favorable reaction catalyzed by a second enzyme, the 1,3-bisphosphoglycerate is then converted to 3-phosphoglycerate, with the accompanying conversion of ADP to ATP. Which of the following statements is true about this reaction? (a) The reaction glyceraldehyde 3-phosphate -> 1,3-bisphosphoglycerate should be inhibited when levels of NADH fall. (b) The ?G° for the oxidation of the aldehyde group on glyceraldehyde 3-phosphate to form a carboxylic acid is more negative than the ?G° for ATP hydrolysis. (c) The energy stored in the phosphate bond of glyceraldehyde 3-phosphate contributes to driving the reaction forward. (d) The cysteine side chain on the enzyme is oxidized by NAD+.