Life history adaptations of ________ populations are characterized by an early age of first reproduction and short maturation time and life span.
A. K-selected
B. r-selected
Answer: B
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According to the lac operon model proposed by Jacob and Monod, what is predicted to occur if the operator is removed from the operon?
A) The lac operon would be transcribed continuously. B) Only lacZ would be transcribed. C) Only lacY would be transcribed. D) Galactosidase permease would be produced, but would be incapable of transporting lactose.
The deuterostomes are animals whose
(a) stomach is in front of the crop. (b) mouth is covered by a fleshy lip. (c) blastopore becomes the anus. (d) digestive tract is lined by mesoderm.
As ice melts
A) hydrogen bonds are broken. B) water molecules become less tightly packed. C) the water becomes less dense. D) heat is released.
DNA differs from RNA because DNA
A) contains thymine in place of uracil. B) consists of a single rather than a double polynucleotide strand. C) contains the sugar ribose rather than the sugar deoxyribose. D) contains phosphate groups not found in RNA.