In scleroderma, patients develop a buildup of collagen in their organs. Scleroderma is a disease of what tissue type?
A. Muscle tissue
B. Epithelial tissue
C. Connective tissue
D. Nervous tissue
Answer: C
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Which of the following is NOT the description
of a human disease caused by roundworms?
a. lymph vessels permanently destroyed causing elephant-like legs b. causal agent lives in rectum; females lay eggs in skin around the anus c. infection results from eating uncooked pork d. intestinal blockage disease affecting more than a billion people e. all of these are human diseases caused by roundworms
Molecules that absorb light are called
A. enzymes. B. pigments. C. photosynthesizers. D. electron carriers. E. absorbers.
How does DNA move during gel electrophoresis?
A) The DNA moves toward the negative electrode. B) Larger pieces of DNA move at a faster rate. C) DNA moves at a constant rate, regardless of fragment size. D) Smaller pieces of DNA move faster toward the positive electrode.
Proteins bind selectively to small-molecule targets called ligands. The selection of one ligand out of a mixture of possible ligands depends on the number of weak, noncovalent interactions in the protein's ligand-binding site
Where is the binding site typically located in the protein structure? (a) on the surface of the protein (b) inside a cavity on the protein surface (c) buried in the interior of the protein (d) forms on the surface of the protein in the presence of ligand