Which is an example of passive immunity?
A. Becoming sick with a virus
B. The transfer of antibodies from mother to fetus through the placenta
C. An injection of a weakened virus
Answer: B
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What is a reflex arc? What components must be present to qualify?
Which of the following structures contains only sensory axons that conduct nerve impulses from sensory receptors in the skin, muscles and internal organs to the CNS?
a) Spinal nerves b) Cauda equina c) Anterior root of spinal nerves d) Posterior root of spinal nerves e) Conus medullaris
Select the best explanation for why protease enzymes are secreted in inactive forms
A) Inactive enzymes will simply be expelled with the feces if no protein is present in the digesting food, this will help to conserve energy. B) The immunoglobulins protecting the digestive tract would be digested without proper regulation of protein digesting enzymes. C) The enzymes would digest each other if they were not properly regulated. D) The cells producing inactive enzymes are themselves protected from the enzymes until they are safely within the lumen of the GI tract.
Sequences of three bases found in messenger RNA (mRNA) are called ________
A) anticodons B) deoxyribose sugars C) codons D) ribosomes E) amino acids