What is meant by the "multiple hit" model of cancer?
A) Most cancer-causing mutations are passed on to future generations.
B) Most cancers occur in many different tissues simultaneously.
C) Multiple mutations are required to cause most forms of cancer.
D) A person gets cancer only if both of his or her parents had cancer.
C
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If two populations diverge geographically and/or genetically from each other, and the process
continues long enough, they may become two different:a. species. b. hybrids. c. polyploids. d. allopolyploids. e. euploids
An example of ex situ conservation is a national park. Indicate whether the statement is true or false
Microbiologists use the Gram stain to aid in the identification of bacteria. What is the major difference between Gram-positive and Gram-negative bacteria?
A. presence or absence of outer plasma membrane B. structure of nucleotides in the plasma membrane C. presence or absence of muramic acid in the cell wall D. presence or absence of peptidoglycan in the cell wall
Vocal signals are used by _____.
A. wolves B. mice C. snakes only D. lizards only E. snakes and lizards