How long does it take for humoral immunity to accomplish antibody production in the first exposure to the pathogen?
A. 13-16 days
B. 2-5 days
C. 3-6 days
D. None of these are correct.
Answer: C
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The enzyme produced by the salivary glands is ________; it breaks down ________.
A. pepsin; starch B. amylase; lipids C. amylase; starch D. pepsin; proteins E. lipase; lipids
A reducing agent donates electrons to a molecule.
Answer the following statement true (T) or false (F)
Describe the functional groups that are considered acidic or basic
A) An amino group acts as a base because it can accept hydrogen ions, and a carboxyl group acts as an acid because it releases a hydrogen ion. B) An amino group acts as a base because it releases a hydrogen ion, and a carboxyl group acts as an acid because it can accept hydrogen ions. C) A phosphate group acts as a base because it can accept hydrogen ions, and a hydroxyl group acts as an acid because it releases a hydrogen ion. D) A phosphate group acts as an acid because it can accept hydrogen ions, and a hydroxyl group acts as a base because it releases a hydrogen ion. E) Phosphate groups can act as an acid or a base depending on the pH of the surrounding solution.
Depolarization of the oocyte plasma membrane occurs when the first sperm attaches to the integrin ?6?1. This is called the
A. slow block to polyspermy. B. acrosomal reaction. C. fast block to polyspermy. D. fertilization. E. spermiogenesis.