____ are dormant structures formed by certain bacteria in response to unfavorable environmental
conditions.
a. Capsids
b. Endospores
c. Endotoxins
d. Exotoxins
e. Heterocysts
B
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Match the following items with the correct phrases.
_______1. Capable of producing antibody-secreting plasma cells after clone formation. _______2. They help regulate the immune response by turning off certain activities. _______3. Phagocytic cells that act as “antigen-presenting cells” in the immune response to (processing of) T-dependent antigens. _______4. The major target of human immunodeficiency virus (HIV). _______5. The only cells required in the immune response to T-independent antigens. a. B lymphocytes (B cells) b. macrophages c. mast cells d. TH lymphocytes (THcells) e. TSlymphocytes (TScells)
When pollen from one species lands on the stigma of a flower from another species, the pollen tube typically ____
a. does not develop b. forms, but the sperm cannot penetrate the egg c. forms and grows to the ovary, but then stops d. forms, but the sperm are killed e. forms and the egg is usually fertilized, but the embryo rarely grows
Because they both associate with proteins that assist in the assemble of their subunits, Rubisco is MOST similar to:
A) antibody molecules B) BiP C) heat shock proteins D) green fluorescent protein (GFP) E) GroES
What is the type of weak bond between the hydrogen of one molecule and the nitrogen of another molecule, where the two don't actively share an electron?
A) ionic bond B) covalent bond C) hydrogen bond D) disulfide bond E) hydrophobic bond