A damaged red blood cell is removed from circulation by
A) phagocytosis by macrophages in the spleen.
B) basophils releasing histamine to stimulate breakdown of RBCs.
C) returning to red bone marrow and autolyzing.
D) being actively transported into macrophages in the liver and spleen.
E) endocytosis directed by monocytes.
A
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Which of the following will not reduce the activation energy of a reaction?
A. addition of a catalyst that shifts Keq higher, thereby increasing product formation B. addition of a catalyst that enables the reaction to proceed by a different mechanism C. addition of an enzyme (catalyst) that binds to and stabilizes the transition state D. addition of an enzyme (catalyst) that can bind to the reactants in an orientation that favors the reaction E. addition of an enzyme (catalyst) that binds to metal ions and hydrogen ions that participate in the reaction
The Hayflick limit describes ____
a. the size limit to which a cell can grow b. the number of divisions a cultured cell can undergo c. the largest number of chromosomes an organism can possess d. the most cells an organism can have e. how rapidly DNA replication can occur
Plants known as "annuals"—that is, those that complete their entire life cycle in one growing season—are found in which of the following groups?
a. angiosperms and ferns b. ferns and mosses c. gymnosperms only d. angiosperms only e. ferns only
Why are K-selected species also known as equilibrium species?
What will be an ideal response?