The nonliving components of an environment, such as weather and water availability, are
A) biotic components.
B) abiotic components.
C) genotypes.
D) alleles.
E) phenotypes.
B
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Multiple sclerosis (MS) is a progressive inflammatory disease of the central nervous system characterized by intermittent damage to myelin (called demyelination) caused by the destruction of specialized cells (oligodendrocytes) that form the substance. Given what you know about the function of myelin, predict the consequences associated with its progressive loss.
_____ Sensory abnormalities (e.g., tingling, numbness, itching, tightness, burning, shooting pain) and motor coordination loss. _____ Racing heartbeat, hyperactivity and nausea. _____ Low levels of potassium in the blood (hypokalemia). _____ Balance and equilibrium abnormalities (e.g., dizziness, vertigo, uncoordinated movements, tremor).
If a human gene mRNA were placed into a cell of yeast, it would be:
a. degraded immediately. b. translated into a repeating amino acid chain. c. translated into a chain of random amino acids not resembling the protein in humans. d. translated into the protein that is found in humans. e. integrated into the genome of the yeast.
Sensilla are sensory hairs involved in taste and smell
____________________ Indicate whether the statement is true or false.
________________ is released from the posterior pituitary gland, acts slowly, and regulates the rate at which the body loses water through the kidneys.
A. Epinephrine B. Norepinephrine C. Antidiuretic hormone D. Testosterone