Numerous hypotheses have been proposed for the mass extinction of about 60% of all species, including nearly all the dinosaurs, about 65 million years ago. Evidence has been found of the impact of a large meteor at about the time of this mass extinction. The amount of dust and debris put into the atmosphere upon impact, as well as atmospheric heating, would have been enormous. Using your knowledge of photosynthesis, speculate about why the dinosaurs subsequently became extinct.
What will be an ideal response?
As exposure to light was eliminated for a period of time, photosynthetic plants would have died off. This would have led to the extinction of herbivores (including herbivorous dinosaurs) and that would lead to the extinction of omnivorous and carnivorous dinosaurs.
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A test cross can be used to do all of the following except
A. determine whether an individual that displays a dominant phenotype is homozygous for the trait. B. determine whether an individual that displays a dominant phenotype is heterozygous for the trait. C. gather genotype information from phenotype information. D. identify the chromosome on which a gene is located.
In clonal selection, cells that have not interacted with antigen do not proliferate
Indicate whether the statement is true or false.
A person with a defect in blood flow to the kidney would have a problem with the _______ artery.
What will be an ideal response?
Gluconeogenesis is primarily used for biosynthesis of
a. cell walls. b. fatty acids. c. purines and pyrimidines. d. proteins.