At what temperature are most household freezers kept?
A) 4 °C
B) 0 °C
C) -20 °C
D) -80 °C
Answer: C
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Match the following items with the correct phrases.
_______1. Crenation of red blood cells would occur if they were placed into a(n) __________ solution. _______2. Adding large quantities of salt or sugar to various types of foods is a way of preserving them. If bacteria should enter such foods, they would find themselves in a(n) __________ environment. _______3. If red blood cells were placed into a(n) __________ solution, they might hemolyze. a. hypertonic b. hypotonic c. isotonic d. gin and tonic
The initial encounter with an allergen is called the ________ dose.
A. sensitizing B. hypersensitivity C. provocative D. desensitizing E. allergic
Why do some Basidiomycetes form a ring like organization, as observed on the top of soil?
a. They deplete the soil of magnesium. b. They deplete the soil of oxygen. c. They deplete the soil of nitrogen. d. They deplete the soil of potassium.
Cell adhesion molecules can be divided into four major groups. Which of the following is not one of those groups?
a. Selectins b. Integrins c. Collagens d. Immunoglobulin superfamily