Why are C4 plants able to photosynthesize with no apparent photorespiration?
A) They do not participate in the Calvin cycle.
B) They use PEP carboxylase to initially fix CO2.
C) They conserve water more efficiently.
D) They exclude oxygen from their tissues.
B
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The phenotypes of complex traits vary with both genotype and environment. An important implication of this is that:
A. we can't predict the expression of a genotype without knowing its environment. B. we can't predict how a given environment will affect the expression of a trait without knowing its genotype. C. no one genotype will produce the "best" phenotype in all environments. D. several different genotypes may produce equally fit phenotypes in the same environment. E. All of these choices are correct.
In a stimulated muscle fiber, the calcium ions released by the sarcoplasmic reticulum bind to the protein _______.
A. myosin B. tropomyosin C. actin D. troponin
Nitrogen has an atomic number of 7. How many
hydrogen atoms are necessary to join with the nitrogen to form a stable compound? a. 1 b. 2 c. 3 d. 4 e. 5
Albinism is an autosomal recessive trait in humans. Assume that there are 100 albinos (aa) in a population of 1 million. How many individuals would be expected to be homozygous normal (AA) under equilibrium conditions?
A) 999,900 B) 10,000 C) 980,100 D) 19,800 E) 100