Which monomer units combine to form nucleic acids?
A) amino acids
B) fatty acids
C) nucleotides
D) sugars
C
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Which of the following statements about stem cells is NOT accurate?
A. Stem cells can undergo mitosis. B. Some stem cells can differentiate into more than one type of specialized cell. C. Different types of stem cells vary in their potency. D. Stem cells are only found in embryos. E. Some stem cells can only differentiate into one cell type.
In pea plants, the allele for round peas (R) is dominant to the allele for wrinkled peas (r). A gardener has a plant that his neighbor gave him that produces round peas, but he does not know its genotype. What simple procedure could he do to determine the genotype of his new plant?
a. Perform a dihybrid cross—if only 1 out of 16 offspring are wrinkled, then the new plant’s genotype is RR. b. Perform a test cross with a plant that has wrinkled peas—if any offspring give wrinkled peas, then the new plant’s genotype is Rr. c. Perform a test cross with a plant that has an Rr genotype—if all of the offspring give round seeds, then the new plant’s genotype is Rr. d. Perform a monohybrid cross—if any offspring give round peas, then the new plant’s genotype is RR.
Which of the following most often leads to allopatric speciation?
A. Habitat isolation B. Mating time differences C. Gametic incompatibility D. Behavioral isolation
If you get a Simpson's index of 1, this means
A) there is only one species in the community. B) all species are in equal proportions. C) the calculation is incorrect as this is theoretically impossible. D) the Shannon index will equal 0.