Biology, 23.10.2019 02:00, drcarver

Action potentials are all-or-none phenomena. this means that group of answer choices a) they must fire a certain number of times a second to communicate information accurately. b) they require a certain amount of stimulus to fire. c) the amplitude of the action potential is independent of the size of the stimulus. d) the amplitude of the action potential changes based on the intensity of the stimulus.

Answers: 3

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answered: asiaosterling

c) the amplitude of the action potential is independent of the size of the stimulus.

Explanation:

Conduction of nerve impulses through neurons is an all or none event. It means that either an axon would fire action potential to conduct the nerve impulse or it will not fire it. The firing of action potential requires the depolarization to reach the threshold level and depends on the strength of the stimulus. Once the stimulus is strong enough to reach the threshold, action potential would be fired. A stronger stimulus would produce the same effect, that is, it will produce the action potential of the same amplitude.

answered: Guest

hey, i believe your answer would be d. sugar ribose and the base uracil. i believe this is the answer, because rna consists of sugar ribose, adenine, guanine, cytosine, and uracil.

your first option is incorrect, because that's dna. where it consists of sugar deoxyribose, adenine, guanine, cytosine and thymine.

your second option is also incorrect, this is because sugar deoxyribose is in dna, and uracil is in rna. these two do not make sense together.

your third option being incorrect, because sugar ribose is in rna, but not the base of thymine. rna consists of uracil, not thymine.

lastly your fourth option being correct! this answer is correct, because both sugar ribose, and the base uracil are in rna! ~

answer is d. sugar ribose and the base uracil.

answered: Guest

interphase

the period of cell growth when the cell synthesizes new molecules and organelles. the cell is not dividing and it constitutes the majority of the time spent in the cell cycle

prophase

changes occur in the nucleus and cytoplasm. the chromatin condenses to form structures (sister chromatids) visible with a light microscope and the mitotic spindle begins to form, but the nucleus is still in tact

prometaphase

the nuclear envelope fragments and the spindle microtubules attach to the kinetochores of the sister chromatids

metaphase

all the cell's duplicated chromosomes are lined up at an imaginary plane equidistant between the poles of the mitotic spindle

anaphase

begins when sister chromatids separate from each other and ending when a complete set of daughter chromosomes arrives at each of the two poles of the cell

telophase

the daughter nuclei form at the two poles of a cell

cytokinesis

the division of a cytoplasm to form two separate daughter cells. usually occurs during telophase during mitosis. this and mitosis make up to mitotic (m) phase of the cell cycle

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Action potentials are all-or-none phenomena. this means that group of answer choices a) they must f...