Phosphorus may be abundant in soils but may also be in availability to the plant.
A. excessive
B. bound to nitrogen
C. limited
D. tightly bound
E. absorbed
C. limited
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Which of the following correctly describes the reproduction of males in Daphnia?
A) Daphnia males are produced asexually from unfertilized eggs. B) Daphnia males are produced sexually through fertilization of eggs but are sterile from birth. C) Daphnia males are produced from a pseudo-sexual union of two eggs. D) Daphnia males are produced asexually but are sterile from birth.
Many angiosperm species ____ animal pollinators
a. compete with b. Parasitic c. deter d. coevolved with e. avoid
When an enzyme has an allosteric activator, it means that
a. a product of the enzyme, or other downstream product, will bind to the enzyme at the active site and inhibit enzyme activity. b. a product of the enzyme, or other downstream product, will bind to the enzyme at the active site and stimulate enzyme activity. c. a product of the enzyme, or other downstream product, will bind to the enzyme at a site other than the active site and inhibit enzyme activity. d. a product of the enzyme, or other downstream product, will bind to the enzyme at a site other than the active site and stimulate enzyme activity. e. a product of a different pathway (not a direct or indirect product of the enzyme) will stimulate the enzyme's activity.
Garrod's information about the enzyme alteration resulting in alkaptonuria led to further elucidation of the same pathway in humans. Phenylketonuria (PKU) occurs when another enzyme in the pathway is altered or missing, resulting in a failure of phenylalanine (phe) to be metabolized to another amino acid: tyrosine. Tyrosine is an earlier substrate in the pathway altered in alkaptonuria. How might PKU affect the presence or absence of alkaptonuria?
A. Anyone with PKU is born with a predisposition to later alkaptonuria. B. Anyone with PKU must also have alkaptonuria. C. It would have no effect, because PKU occurs several steps away in the pathway. D. It would have no effect, because tyrosine is also available from the diet. E. Anyone with PKU has mild symptoms of alkaptonuria.