Which of the following molecules controls progress of the cell cycle?
a. anucleic acids
b. checkpoint proteins
c. phospholipids
d. adenosine triphosphate
e. adhesion substances
Answer: b. checkpoint proteins
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Arrange in the correct sequence these components of the mammalian immune system as it first responds to a pathogen
I) Pathogen is destroyed. II) Lymphocytes secrete antibodies. III) Antigenic determinants from pathogen bind to antigen receptors on lymphocytes. IV) Lymphocytes specific to antigenic determinants from pathogen become numerous. V) Only memory cells remain. A) I ? III ? II ? IV ? V B) III ? II ? I ? V ? IV C) II ? I ? IV ? III ? V D) IV ? II ? III ? I ? V E) III ? IV ? II ? I ? V
Capsules are particularly important for
A) making bacteria more vulnerable to host defense mechanisms. B) making bacteria less pathogenic. C) protecting bacteria from host defense mechanisms. D) allowing bacteria to become more phagocytic.
The reason why twelve species of fruit-eating
pigeons can survive in Papua New Guinea’s tropical rain forests is related to a. mutualistic associations. b. commensalism. c. resource partitioning. d. mutualistic associations and resource partitioning e. mutualistic associations, commensalism, and resource partitioning.
In osmosis, water moves from an area of high solute concentration to an area with lower solute concentration.
Answer the following statement true (T) or false (F)