A rare disease is now understood to be caused by a single mutant gene. When the researcher learns that the gene encodes a ________, he says "Oh good! We may be able to treat the disease with recombinant protein produced in E. coli and delivered by injection."
A. ribozyme
B. protein hormone
C. component of chromatin
D. mitochondrial enzyme
E. cell-surface receptor
Answer: B
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Some species of sharks, rays, and bony fish sense the movement of prey through the use of:
a. electroreceptors. b. mechanoreceptors. c. thermoreceptors. d. interoceptors. e. nociceptors
Thin sheets of ________ form a cushion-like surface for moving joints
A) red bone marrow. B) cartilage. C) spongy bone. D) compact bone.
Embryonic development begins with a single egg fertilized by a single sperm forming a zygote. The
zygote then undergoes mitosis; how many cells would be present at the conclusion of 4 mitotic divisions?
a. 2 b. 4 c. 8 d. 16 e. 32