What is the best definition of speciation?
a. the process by which new species form
b. the formation of a new species because of population isolation
c. the formation of a new species because of temporal isolation
d. the formation of a new species due to geographic isolation
e. the formation of a new species because of genetic divergence
Ans: a. the process by which new species form
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The "9+2" arrangement refers to:
A. the number of dynein arms present in an axoneme. B. the number of microfilaments in an axoneme. C. the number of microtubules in an axoneme. D. the number of ATP required for movement of an axoneme.
The three most common glycosaminoglycans (GAGs) are ________, ________, and ________.
Fill in the blank(s) with the appropriate word(s).
Summarize two pathways to colon cancer
What will be an ideal response?
Luria and Delbruck grew many liquid cultures of bacteria then spread a small sample of each culture on nutrient agar infused with bacteriophage in separate petri plates. They assayed the number of bacterial colonies that formed on each plate. What did the appearance of a bacterial colony on a petri plate indicate?
A) The bacterial colony was derived from one initial cell that was resistant to infection by the bacteriophage. B) The bacterial colony was made up of many cells that became resistant to bacteriophage infection independently. C) A colony formed when a bacterial cell was not resistant to bacteriophage infection. D) The bacterial cells that made up a colony were resistant to antibiotic.