Which antibody class acts as a B cell receptor?
a. IgG
b. IgA
c. IgE
d. IgD
e. IgM pentamer
ANSWER: d
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Which of the following are not part of plant defense systems for pathogens?
A. Protein receptors detect a broad class of molecules produced by many pathogens and mount defense mechanisms. B. R proteins inside the plant cells recognize AVR proteins on pathogens. C. Plants reinforce barriers, such as by closing stomata and reinforcing cell walls. D. Cells surrounding the infection site produce reactive oxygen species. E. Plants produce AVR proteins when invaded by a pathogen.
We are unable to exert any conscious control over the contraction of smooth or cardiac muscle. These muscles are referred to as ________ muscle
Fill in the blank(s) with correct word
All of the following are found in the cell walls of gram-positive bacteria EXCEPT_______
a. peptidoglycan b. teichoic acid c. lipid A d. N-acetylglucosamine e. lipoteichoic acid
All the cells that are not germ cells (egg and sperm cells or their precursors) are called ________ cells.
Fill in the blank(s) with the appropriate word(s).