How were the sequences that compose the replication origins in yeast discovered?
What will be an ideal response?
Yeast cells were grown in heavy isotope media to produce denser DNA and then shifted to media with normal, light isotopes. After a few minutes, DNA from these cells was extracted and cut into small pieces. The lighter DNA fragments (which should contain the origins of replication) were collected, fluorescently labeled, and used to hybridize a microarray of yeast sequences. Determination of the sequences to which this light, fluorescently labeled DNA hybridized led to the identification of a number of yeast replication origins.
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In your vegetable garden you are growing yams. Yams are modified root tissue from the plant. What is the function of the yam for the plant?
A. It stores water for the plant in times of drought. B. It stores sugar for the plant. C. It provides greater surface area for water absorption. D. It provides greater surface area for the growth of additional root meristems.
A plant's ability to absorb carbon dioxide is reduced when:
A. water is plentiful. B. temperatures are cold. C. stomata are closed. D. the epidermis is lacking. E. mesophyll cells lack air spaces.
What is the name of the birth defect in which the neural tube fails to close completely?
a. neurulation b. fossa ovalis c. organogenesis d. spina bifida e. capacitation
A result that is very unlikely to have occurred by chance alone is said to be ________ .
a. free from bias b. scientifically accurate c. scientifically novel d. free from sampling error e. statistically significant