What was the basic problem with the Miller-
Urey early atmosphere experiments?
a. there was no lightning on the early Earth
b. there was no hydrogen gas in Earth’s early
atmosphere
c. they used oxygen gas which was not
present in Earth’s early atmosphere
d. the mixture of gases they used was not
representative of Earth’s early atmosphere
e. more than one of these is correct
D
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Outline the three stages involved in the transcription of a DNA molecule
What will be an ideal response?
Species A prefers a more dry habitat but grows in a wet habitat. Why might this be?
A) Species B outcompetes A in the dry habitat. B) Species A's fundamental niche is restricted to a wet habitat. C) Species A requires large amounts of moisture to grow. D) Species B prefers a wet habitat.
Which is NOT true of prokaryotes?
A) They contain ribosomes. B) Their cells contain a true nucleus. C) Their genes contain exons. D) They include bacteria. E) They are single-celled organisms.
"Sticky ends" are ________
A) single-stranded ends of fragments of double-stranded DNA B) regions of double-stranded DNA that can be cut by a restriction enzyme C) portions of DNA used as markers for STR analysis D) regions of DNA amplified in PCR