A population of birch trees is present on the side of a mountain and is preyed upon by beetles that burrow into bark. Which tree would be the most fit?
A) a tree that grows to be the tallest
B) a tree that has thicker bark
C) a tree with more active photosynthetic enzymes
D) a tree that has thick, strong roots
B
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How is recombinant DNA introduced into bacterial cells?
A. Most bacterial cells are naturally competent so DNA just needs to be mixed with the cells. B. Many bacterial cells can be transformed after being made competent by treatment with cold CaCl followed by a brief heat shock at 43°C. C. Many bacterial cells can be transformed by applying high voltage to a mixture of cells and DNA for a sustained period of time. D. Transformation can occur if DNA is mixed with bacterial cells that have been heat shocked. E. None of these choices are correct.
Sister and Non-Sister Chromatids
What will be an ideal response?
The main purpose of preparing karyotypes is ____
A. to reveal chromosome abnormalities B. to determine gender C. to determine which genes are on which chromosomes D. to isolate and analyze genes E. all of these
In moss, _____ produce sperm.
a) protonemata b) antheridia c) archegonia d) embryos e) sporangia