The area on the retina that has the greatest density of cone cells is called the ____
a. fovea
b. visual ganglion
c. lateral geniculate nucleus
d. visual cortex
e. blind spot
ANSWER: a
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Even though there is free rotation around the glycosidic bond of nitrogenous bases, steric hindrance:
A. causes the purines to adopt only the anticonfiguration. B. causes the pyrimidines to adopt only the syn configuration. C. causes pyrimidines to adopt only the anti configuration. D. causes purines to adopt only the syn configuration. E. only affects purine bases; pyrimidines are allowed to adopt any configuration.
A lipid is a(n) ____
a. polar hydrocarbon b. polar peptide c. nonpolar peptide d. ionic polar hydrocarbon e. nonpolar hydrocarbon
Given your results from the baby's spit up/vomit, you run an X-ray while the baby is eating. This allows you to determine whether there is a blockage in the organ that generates that enzyme (physical), or if there is a problem with the enzymes themselves (chemical). Which of the following results would help you decide whether the problem is solely physical or chemical?
a. Chemical: The enzyme was spit up, but the digestive path appears normal b. Physical: The enzyme was spit up, but the digestive path appears normal c. Chemical: The enzyme was spit up, but the digestive path has a lump stopping movement of food d. Physical: The enzyme was not spit up, but the digestive path has a lump stopping movement of food e. Chemical: The enzyme was not spit up, and the digestive path appears normal
The sunflower species Helianthus anomalus is thought to have been formed by hybridization between the sunflower species H. petiolaris and H. annuus because it contains a set of chromosomes from both parental species. H. anomalus is most likely an example of instantaneous speciation through
A. allopolyploidy. B. parthenogenesis. C. hybrid sterility. D. autopolyploidy.