The phase at the end of an action potential when the membrane potential becomes more negative than it is at rest is the ________ phase.
A) threshold
B) depolarizing
C) repolarizing
D) hyperpolarizing
E) refractory
D) hyperpolarizing
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What is the outcome of crossing two pure-breeding plants with antagonistic traits?
A) Only one of the traits will be seen in the progeny. B) Both traits will be seen in the progeny. C) Both traits will be seen in the progeny in a 3:1 ratio. D) Only one trait will be seen and it will be the trait of the female.
Photosynthesis must provide a source of electrons and H+ ions because ______________
a. atmospheric CO2 must be oxidized by adding electrons b. CO2 must be reduced to produce sugars c. hydrogen atoms are added to oxygen to form water d. hydrogen ions and electrons react to produce hydrogen gas e. hydrogen ions and electrons are converted into oxygen gas
Agar is produced by
a. brown algae. b. red algae. c. phycobilins. d. foraminiferans. e. brown and red algae.
This is a nucleotide containing molecule that is commonly used to carry electrons in the cell.
A. NAD+ B. ADP C. pyruvic acid D. ATP