The plasma membrane is composed of a single type of protein.
A. True
B. False
B. False
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A reflex arc differs from other responses to stimuli in that ____________________
a. it occurs without processing within the brain b. no neurons are required to bring about the response c. it involves a lot of integration and signal generation in the brain d. motor neurons are typically not activated
What phenotypic effects does crowding have on the migratory locust? How are these changes
adaptive?
What will be an ideal response?Huntington's disease is caused by a single dominant allele. It is a lethal disease, yet it persists in the human population. Which of the following statements best describes why?
A. Huntington's disease is sex-linked and every human has at least one X chromosome; thus, the chances are extremely high for this allele to be maintained in the human population. B. While lethal to a parent, Huntington's disease will not be lethal to the offspring since it can skip a generation. C. Huntington's disease presents symptoms in mid-life, after most people have already had offspring. D. Huntington's disease can present symptoms so mild that they appear to lack dominant expression of the allele in some individuals; in those cases, the allele is passed on to the offspring. E. Even though Huntington's disease is lethal, it improves chances for reproduction before the person dies.
Which of the following statements regarding protozoa is FALSE?
A) Protozoa are unicellular eukaryotes. B) Nearly all protozoa cause disease. C) Most protozoa reproduce asexually. D) Protozoa are common in water and soil. E) Some protozoan pathogens are transmitted by arthropod vectors.