Compared to uric acid, how much energy and water are required if urea is the main form of nitrogenous waste?
a. less energy and more water
b. more energy and less water
c. the same amount of energy and water
d. less energy and water
Answer: a. less energy and more water
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The questons below refer to the following phylogenetic trees
I. II. III. IV. 12) Which tree depicts the microsporidians as a sister group of the ascomycetes? A) I B) II C) III D) IV
Why is ubiquitin nicknamed the "doom tag"?
a. When ubiquitin binds to a target protein, the ubiquitin enzyme degrades the protein. b. When ubiquitin binds to a target protein, the complex is sent to the proteasome and degraded. c. If a cell is deficient in ubiquitin, the cell will die. d. High levels of ubiquitin in a cell cause the cell to destroy vital proteins, leading to premature cell death. e. Ubiquitin binds to ribosomes and prevents them from translating proteins necessary for cell survival.
What is the function of kinetochores?
a. Kinetochores anchor spindle fibers to the centrioles. b. Kinetochores are the site of DNA synthesis. c. Kinetochores regulate the length of the cell cycle. d. Kinetochores attach to microtubules during mitosis. e. Kinetochores are involved in cytokinesis.
When a protein is denatured, the turnover number will
A. increase. B. remain the same. C. decrease. D. change with the pH.