Consider a pizza dough made by vigorously mixing to form gluten and evenly disperse the ingredients such as baker's yeast (Saccharomyces cerevisiae)
Predict the metabolic differences yeast would have in a thinly flattened dough and in a spherical dough ball.
What will be an ideal response?
Answer: A flattened dough would have higher surface area and more oxygen exposure to support aerobic respiration of S. cerevisiae. The dough ball on the other hand would initially have aerobic metabolism of S. cerevisiae due to the mixing. Once oxygen is depleted from respiration the yeast would begin anaerobic fermentation, especially in the center of the dough ball while the surface of the dough ball could still support aerobic growth if not enclosed in a container.
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The African clawed frog (Xenopus laevis) is allotetraploid, likely as a result of an interspecies mating long ago, followed by a duplication of the entire genome. Xenopus laevis is fertile and has a normal life cycle
In contrast, mules, the allodiploid offspring of a male donkey and a female horse, are generally sterile. Why can Xenopus reproduce and mules cannot? A. Frogs are less sensitive to multiple copies of the genome than mammals. B. In allotetraploid organisms each chromosome has a chromosome to pair up with in meiosis, whereas in allodiploid organisms they do not C. The two frogs that interbred to form the Xenopus laevis must have been more closely genetically related than the donkey and horse are. D. The mule must have a genetic mutation that prevents it from reproducing.
Which transporter is an example of a passive transporter in animals?
a. Sodium b. Starch c. Glucose d. Calcium e. Phosphate
What is the combined function of the malleus, incus, and stapes?
a. convert the mechanical vibration of the tympanic membrane into a pressure wave in the cochlear duct b. amplify the vibrations of the ear drum c. equalize the pressure on both sides of the tympanic membrane d. convert the oval window's vibrations into vibrations of the tympanic membrane e. dampen the vibrations of the tympanic membrane
Which statement about phenotype is false?
A. The phenotype is what the environment acts on B. A behavior is a phenotype C. Phenotypes are typically affected by a single genetic locus D. The phenotype is what natural selection acts on