A person hears a sound coming from a hole in the ground. Sometime later a groundhog is seen emerging from the hole in the ground. The person suspects that the sounds were made by the groundhog since they have witnessed this behavior before. The underlined portion of this story is best described as a(n)
A. experiment.
B. hypothesis.
C. observation.
D. test of a hypothesis.
B. hypothesis.
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The core genome of a prokaryotic species is the genomic content that is
A) unique compared to all other prokaryotes. B) expressed under all environmental conditions. C) shared between all other prokaryotes. D) shared between all strains of a species.
Facilitated diffusion is an important method for cells in obtaining necessary molecules and removing other ones. Requirements for facilitated diffusion include
A. The carrier molecule is nonspecific to the molecule that is transported. The direction of movement is always against the concentration gradient, never with the gradient. B. The carrier molecule must be specific to the molecule that is transported and an ATP molecule must be attached to the specific carrier. The direction of movement is always against the concentration gradient, never with the gradient. C. The carrier molecule is nonspecific to the molecule that is transported. The direction of movement is always with the concentration gradient, never against the gradient. D. The carrier molecule must be specific to the molecule that is transported. The direction of movement is always with the concentration gradient, never against the gradient.
What is the difference between pollination and fertilization?
A. Pollination is the movement of pollen from the male region of a plant to the female region. Fertilization is the union of a sperm and egg. B. Pollination is the movement of pollen from the female region of a plant to the male region. Fertilization is the union of a sperm and egg. C. Pollination is the same as fertilization. D. Fertilization is the movement of pollen from the male region of a plant to the female region. Pollination is the union of a sperm and egg.
Which of the following do NOT contain endoplasmic reticulum?
A. noneukaryotes B. animal cells C. eukaryotic cells D. All of the choices are correct.