A teratogen is a drug that:a
increases fertility.
b. prevents fertilization.
c. prevents implantation of the embryo in the endometrium.
d. induces labor.
e. interferes with morphogenesis.
e
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Which of the following large organic molecules include table sugar?
A. Carbohydrates B. Lipids C. Nucleic acids D. Proteins
How can mutations in different genes, functioning in different cells, lead to the same disease? From the following, choose the best responses to complete the sentences: "Physiological function requires that multiple cells work together. Various defects in different cells can impair function, leading to ___________ that are indistinguishable at the level of the whole organism. In Charcot-Marie-Tooth disease, motor nerve function can be impaired either by a problem within _______________ , or a problem in __________________ causing _______________."
Charcot-Marie-Tooth is the most commonly inherited peripheral neuropathy, and has no known cure. Patients suffer damage to motor and sensory neurons, leading to degeneration of muscles and gradual loss of motor control. A. defects; somatic cells; oligodendrocytes; demyelination B. symptoms; motor neurons; Schwann cells; demyelination C. symptoms; sensory neurons; Schwann cells; fast axonal transport D. genotypes; dendrites; axons; fast axonal transport Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content/Choose Answer · What do you already know about components of the nervous system? What other information is related to the question? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
DNA is important to a cell because
a. DNA is the cell membrane that allows nutrients to enter the cell and wastes to leave. b. DNA contains the information necessary to make all of the molecules required by the organism. c. DNA contains the information necessary for the cell to reproduce itself. d. DNA is the cell membrane that allows nutrients to enter the cell and wastes to leave, DNA contains the information necessary to make all of the molecules required by the organism, and DNA contains the information necessary for the cell to reproduce itself, e. DNA contains the information necessary to make all of the molecules required by the organism and DNA contains the information necessary for the cell to reproduce itself.
When an animal cell is placed in a hypotonic solution and water enters the cell via osmosis, the volume of the cell increases until it bursts. This does not happen to plant cells, because _____
A) they have large central vacuoles, which provide abundant space for storage of incoming water B) they have cell walls, which prevent the entry of water by osmosis C) they have cell walls, which provide pressure to counteract the pressure of the incoming water D) certain gated channel proteins embedded in their plasma membranes open as osmotic pressure decreases, allowing excess water to leave the cell