Pepsin, a digestive enzyme that degrades proteins in the stomach, is synthesized as pepsinogen and
converted to active pepsin in the stomach by the removal of several amino acids. The activation of
pepsin is an example of
a. transcriptional regulation.
b. translational regulation.
c. posttranscriptional regulation.
d. posttranslational regulation.
e. RNA interference.
D
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About 55% of whole blood is ________, which is/are mostly made up of water
A) plasma B) hemoglobin C) white blood cells D) clotting proteins E) hematocrit
Which of the following triggers the cell's passage past the G2 checkpoint into mitosis?
A) PDGF B) MPF C) cyclin D) Cdk
A researcher creates an antibiotic that binds to a protein present only on B. anthracis (the causative agent of anthrax), lysing the cell from the outside. After a couple of years using this antibiotic, some resistant organisms are found. Which of the following best outlines the mechanism for development of this resistance?
a. mutation in B. anthracis ? altered target ? resistant bacterium b. cell division of B. anthracis ? altered porins ? resistant bacterium c. mutation in B. anthracis ? altered porins ? resistant bacterium d. cell division of B. anthracis ? altered target ? resistant bacterium
Cytokines are protein-based chemical messengers that allow for communication between cells of the immune system
Indicate whether the statement is true or false