A malignant black tumor of skin is a(n):
A) onychoma
B) xanthoma
C) adenoma
D) melanoma
D
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The smallest structural unit of the body is:
a. DNA b. organelles c. cells d. tissues
Clark received a vaccine to help protect him against the measles, but his childhood friend Nicole contracted the measles since she did not receive a vaccine. For each person, determine if active immunity or passive immunity is involved and explain why
Clark benefitted from the vaccine. What will be an ideal response?
The epithelium lining the oropharynx is
A) simple squamous. B) simple cuboidal. C) simple columnar. D) stratified squamous. E) pseudostratified squamous.
Which of the following is true about the movement of ions across excitable living membranes?
A) Ions always move actively across membranes through leakage channels. B) Some ions are prevented from moving down their concentration gradients by ATP-driven pumps. C) Sodium gates in the membrane can open in response to electrical potential changes. D) The bulk of the solutions inside a cell are negatively charged.