Carbon-12 has six protons and six neutrons in its nucleus. Carbon-14 has six protons and eight neutrons in its nucleus and is radioactive. Carbon-14 is an example of a(n) ________.
Fill in the blank(s) with the appropriate word(s).
Answer: isotope
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Peristalsis is the _____
A) movement of the muscular layer surrounding the alimentary canal that is under voluntary control B) rhythmic waves of contraction of the muscular layer surrounding the alimentary canal that are responsible for moving contents of the lumen along the length of the digestive tract C) movement of nerve impulses from the central nervous system to the autorhythmic smooth muscle cells D) rhythmic lengthening and shortening of epithelial cells lining the lumen of the alimentary canal
A population of T cells has been stimulated to proliferate in response to a particular antigen. A sample of 1000 cells is examined microscopically, revealing that 200 of these cells are in the various stages of mitosis. Of the remaining 800 in interphase, 400 have x amount of DNA, 250 have 2x, and the remaining 150 have amounts somewhere between x and 2x. Additional analysis reveals that the G2
phase of the cell cycle lasts 2 hours. What is the total length of the cell cycle? A) 2.5 hours B) 4 hours C) 6.4 hours D) 8 hours E) 13.3 hours
Exchange of respiratory gases through the skin is a
characteristic of many a. fishes. b. amphibians. c. reptiles. d. mammals. e. birds.
In ________, a zygote formed by IVF is implanted into the oviduct through a small incision. Fill in the blank(s) with the appropriate word(s)