The central axis around which the shell of a snail coils is called the
a. Aperture
b. Columella
c. Sinistral
d. Dextral
e. Torsion
Answer: b. Columella
You might also like to view...
The sum total of all chemical reactions occurring in a cell is called
A. metabolism. B. catabolism. C. anabolism. D. None of the choices are correct.
Which of the following is routinely used to detect spirochetes in skin lesions in early syphilis?
A. Phase-contrast microscopy B. Dark-field microscopy C. DNA fingerprinting D. Bright-field microscopy
AIDS is short for
a. Acquired Immune Deficiency Syndrome. b. Accelerated Immune Death Syndrome. c. Accentuated Induced Deficiency Syndrome. d. Advantageous Immunity Deficiency Syndrome. e. none of these.
Steroid hormones ________
A) begin their action outside the membrane B) usually diffuse through the plasma membrane into target cells C) bind to receptors in the plasma membrane D) are water soluble