Could a varying, self-replicating population of RNA molecules be considered alive?
A) No, because such a population would not be contained inside a cell.
B) Yes, because such a population would show variation, inheritance, and selection.
C) No, because RNA molecules are not subject to selection.
D) Yes, because RNAs code for proteins that can then replicate the RNAs.
E) No, because ribonucleotides are not suited for energy transfer functions.
B
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Each of the following statements is true for Toxoplasma gondii except that
A. it can cause stillbirth. B. infection often fatal for AIDS patients. C. it is a flagellated parasite. D. it has a narrow host range.
Scuba divers use a BCD to control buoyancy. It is essentially a bag that can be inflated or deflated to prevent excessive sinking or floating. How do bony fish accomplish this?
A. They pump their operculum. B. They adjust the level of gasses in their swim bladder. C. They adjust their position using the pectoral and pelvic fins. D. They swim rapidly to saturate the blood with oxygen.
The organ that performs filtration of blood, reabsorption, and secretion in vertebrates is the ________.
A. kidney B. liver C. large intestine D. pancreas E. small intestine
Which is incorrect about the Fc region of an immunoglobulin?
A) It determines the class to which the immunoglobulin belongs. B) It determines the antibody's distribution in the body. C) It contains an effector molecule that can fix complement. D) It contains an effector molecule that can bind to cells such as macrophages and mast cells. E) It forms the antigen binding sites.