The retinoblastoma protein (pRB), like p53, serves as a(n) ________ in regulating the cell cycle
A) up regulator
B) tumor suppressor
C) tumor enhancer
D) oncogene
E) pseudooncogene
B
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In terms of classification, humans belong to which domain?
a. prokaryote b. Eukarya c. Archaea d. Bacteria e. protists
Which model would predict the abrupt appearance of a new species in the fossil record, with little or
no evidence of intermediate forms? a. anagenesis b. gradualism c. microevolution d. paedomorphosis e. punctuated equilibriu
Within the endoplasmic reticulum, ________ recognizes misfolded or unassembled proteins and transports them back to the cytosol
Fill in the blank with correct word.
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. Even though Huntington's disease is lethal, it improves chances for reproduction before the person dies. D. Huntington's disease presents symptoms in midlife, after most people have already had offspring. E. 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.