How would the movement of a nerve impulse be described?
A) the change in the magnetic field along a neuron
B) the passage of ions through the membrane of a neuron
C) the movement of tiny filaments inside a neuron
D) the change in a neuron so that the inside becomes more negatively charged
B
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Molecular oxygen (O2), which is required for the production of ATP by mitochondria, must pass through at least three membranes to get to the enzymes where it is used
O2 is also produced in chloroplasts and must pass through at least four membranes to be released from the plant. How does O2 move across biological membranes? A. There are numerous protein transporters that allow O2 to travel across membranes. B. O2 is nonpolar, and very small, so it can diffuse across the membrane. C. O2 undergoes a chemical reaction that binds it to other substances that are transported across the membranes. D. O2 is hydrophilic and travels with water across the membranes.
A thylakoid that is placed in a basic solution will synthesize ATP. How is this possible?
A. The carbon reactions are blocked in the thylakoid at high pH. B. ATP is formed spontaneously at low pH. C. ATP cannot be broken down at low pH. D. A proton gradient is created by the difference in pH. E. An electron gradient is created by the difference in pH.
In Mendel’s experiments, which of the following generated identical F 1 and F 2 offspring ratios?
a. reciprocal crosses b. meiosis c. test crosses d. mitosis
Acidic" is an appropriate description for all
EXCEPT which one of the following? a. excess hydrogen ions b. the contents of the stomach c. magnesium hydroxide d. HCl e. a pH less than 7