How do we know that differentiation produces specialized cells without the loss of genes?
What will be an ideal response?
We know that differentiation does not occur through selective gene loss from two areas of study. First,
if a nucleus from a fully differentiated tissue is inserted into a fertilized egg where the nucleus was
destroyed, the egg can develop into a normal individual. This work was originally conducted with
frogs. Second, cloning that starts with an adult cell nucleus is only possible if adult cells have not lost
genes. Dolly is an example.
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Scientists discovered that the primary reason leaves either develop as simple or compound is related to:
A. whether the KNOX gene is active or not active B. where the leaf primordium is positioned C. whether auxins are moving in the stem tip D. how fast the KNOX gene arrives at the primordium E. the protein PHANTASTICA and its interaction with auxins
A gram-negative bacillus that is hydrogen sulfide (H2S)-positive, citrate-positive, spot in-dole–negative, and associated with gastroenteritis in the United States is most likely:
a. K. pneumoniae. b. P. vulgaris. c. Salmonella enteritidis. d. S. sonnei.
The phenomenon where one species diverges into many by occupying a different habitats within a region is called ________.
Fill in the blank(s) with the appropriate word(s).
Aerotolerant anaerobes ________.
A. synthesize superoxide dismutase, but not catalase B. synthesize both superoxide dismutase and catalase C. synthesize catalase but not superoxide dismutase D. synthesize neither superoxide dismutase nor catalase