Which of the following is true of supercoiling?
A. The relaxed form of DNA is more stable and is therefore the preferred form in the cell.
B. Most organisms maintain their DNA in a slightly overwound state in order to enhance strand separation during transcription and replication.
C. Overwound DNA is in the B form so relaxed DNA has less turns than B-form DNA.
D. Most organisms maintain their DNA in a slightly underwound state in order to compact their DNA.
E. The relaxed form of DNA can only be maintained if the DNA is a closed circle.
D
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Which of the following diseases are caused by an ascomycete? Check all that apply.
_____ apple scab _____ wheat rust _____ powdery mildew _____ chestnut blight _____ Dutch elm disease
The KN-1 gene in maize is normally expressed in ____
a. in primary meristems, where it initiates the process of differentiation b. in apical meristems, where it maintains the undifferentiated state c. in apical meristems, where it initiates the process of differentiation d. in primary meristems, where it maintains the undifferentiated state e. in lateral meristems, where it initiates the process of secondary growth
The greenhouse effect is a natural and important phenomenon because it
A) removes smog from affected areas. B) maintains the surface temperature on Earth. C) reverses the effect that CFCs have on the ozone layer. D) decreases the amount of carbon dioxide in the stratosphere. E) reverses the effects of deforestation.
An ________ is a region where the river meets the sea.
Fill in the blank(s) with the appropriate word(s).