If there is 24% guanine in a DNA molecule, then there is _____ cytosine
A) 24%
B) 26%
C) 48%
D) 52%
E) impossible to determine
A
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The owner of a plant nursery is introducing the new night janitor to his duties. “Behind this door are the poinsettias,” she said, “Please don’t clean this room, and leave the door closed.” Why might the owner say this?
A. Poinsettias are short-day plants that require a long uninterrupted period of darkness to flower. Even a short flash of light at night could prevent flowering. B. Poinsettias are very sensitive to the chemicals used in cleaning, which can interfere with the gibberellin-dependent pathway and disrupt flowering. C. Poinsettias are tropical plants and require constant warm temperatures for flower formation. D. Poinsettias are long-day plants that require a long period of light for flower formation, and this light might disrupt the day-night cycles of other plants outside the room. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about short-day and long-day plants? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
The characteristic that makes the muscle cells unique is the relative abundance and organization of
A. fibroblast cells. B. actin and myosin fibers. C. gelatinous mass. D. keratin fibers. E. collagen fibers.
A flower has four copies of each chromosome. This is an example of ________
Fill in the blank(s) with correct word
Suppose Pasteur's swan-necked flasks containing boiled broth became cloudy (evidence of bacterial growth) 24 hours after boiling. Which chose could best explain the turbidity or cloudiness in the broth without supporting spontaneous generation?
a. endospores in the broth survived boiling and grew after the broth cooled b. contaminating organisms in the broth killed by being become alive again after the broth cooled c. chemicals in the broth came together to form living organisms d. the broth allowed light o pass through it with less interference after boiling