Which of these events happens first in nearly all seed germination?
A) The cotyledons appear above ground, turn green, and photosynthesize.
B) The radicle emerges from the seed, which permits the uptake of water and nutrients from the soil.
C) The hypocotyl elongates to lift cotyledons above ground.
D) Lateral roots develop and expand into surrounding soil.
Answer: B
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An organism is considered truly multicellular when ________.
A. its cells form colonies B. its cells specialize in various tasks C. each cell can carry out all of life's functions D. its cells cannot survive on their own
Action potentials are propagated in a one-way direction down a neuron plasma membrane because
a. the action potential is of insufficient intensity to stimulate the voltage-gated ion channels behind it. b. the adjacent channels upstream from the action potential are ligand-gated. c. the adjacent channels upstream from the action potential are in their refractory period. d. voltage-gated ion channels are suppressed. e. the adjacent channels upstream from the action potential are at their threshold potential.
The animals most like the ancestral protist colonies that likely gave rise to all animals are
A) nematodes. B) arthropods. C) echinoderms. D) chordates. E) sponges.
Unlike eukaryotic cell division, in bacterial cell division
a. chromosomes are not separated before cell division. b. chromosomes are always replicated to several copies before cell division takes place. c. the DNA itself is involved in the mechanism for segregating chromosomes. d. chromosomes are not specifically separated, so many cells are anucleate or dinucleate. e. a protein apparatus actively pulls chromosomes apart before division.