Which of the following is a product of the Calvin cycle?
a. carbon dioxide
b. glucose
c. oxygen
d. water
b. glucose
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The eastern meadowlark and the western meadowlark are two bird species that look very similar to each other. Why do biologists not consider them the same species?
A. The two species experience the reproductive barrier of habitat isolation. B. Species are not determined by appearance but by their ability to interbreed naturally. C. The two species do not live in the same habitat and thus do not interbreed in nature. D. All of the above are correct.
How can a mutation in a tumor-suppressor gene behave as a recessive allele at the cellular level, but appear as a dominant allele in pedigree analysis?
A) Some functional protein can still be produced in a cell heterozygous for a loss-of-function allele; however, an additional mutation can inactivate the second allele, eliminating all functional protein allowing cancer to occur in many family members. B) A single functional allele is sufficient to regulate the cell cycle, but not sufficient to promote apoptosis, allowing cancer to develop in every generation. C) A cell with half the amount of the functional tumor-suppressor protein can form benign tumors that will occur in every generation in the pedigree. D) Some functional protein can still be produced in a cell heterozygous for a loss-of-function allele; but loss-of-function tumor-suppressor alleles are so common in the population that many individuals are homozygous.
Based on the figure, which of the following is the most likely explanation for the observed pattern of MRSA strains
What will be an ideal response?
eukaryotes
What will be an ideal response?