Spring has sprung and so has your garden. Cleaning out the beds in preparation can be tiring but rewarding. The day after doing so, you realize you received an extra reward this year because your skin is covered in itchy, red, swollen blisters. Poison ivy is characterized as which of the following?
a. immediate hypersensitivity
b. immunodeficiency
c. delayed hypersensitivity
d. autoimmune reaction
c. delayed hypersensitivity
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This curve most likely represents a graph of enzyme activity
a. as a function of temperature. b. as a function of pH in a strongly acidic environment. c. as a function of pH in a strongly basic environment. d. as a function of pH in a fairly neutral environment. e. as a function of temperature and pH combined.
During prophase I of meiosis
1.chromosomes condense. 2.chromosomes are aligned on the equator of the cell. 3.nuclear envelopes form in some species but not in others. 4.homologous chromosomes are separated. 5.DNA is replicated.
How could lipids lead to a myocardial infarction?
What will be an ideal response?
Mutations in the DFNA20/26 locus, which codes for the actin gamma 1 protein, are associated with congenital deafness. An irate senator complains that government money is being wasted on studies of this mutant gene-in yeast! "I am no biologist," says the senator, "but I am pretty sure yeast don't have ears." How do you respond?
A. "We can learn valuable information about the transcription of the mutant gene in yeast. It is much more difficult to study transcription in human cells." B. "We can learn valuable information about sound transmission through the mutant yeast. By placing a speaker against a yeast vial and recording sound from the other side, we can infer how the mutant actin affects sound waves." C. "We can learn valuable information about the structure of the mutant protein by expressing it in yeast. It is difficult to collect large amounts of actin from tiny hair cells, and unethical to collect it from human patients." D. "You are right, Senator -- yeast do not have ears. We should revoke the funding immediately."