Which step in the evolution of life is the most
complex and probably occurred last?
a. formation of DNA
b. formation of protein-RNA systems
c. formation of membrane-bound proto-cells
d. spontaneous formation of organic compounds
under abiotic conditions
e. formation of ATP
Answer: c
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Individuals with diabetes (diabetes mellitus), in which blood glucose levels can be toxically high, are often recommended to avoid consuming sucrose (table sugar)
a) Why is sucrose not recommended for diabetics? b) Why would diabetics be urged to avoid foods that are high in starch? What will be an ideal response?
The area where the petiole detaches from the stem is referred to as the:a
abscission zone. b. middle lamella. c. bundle sheath extension. d. terminal bud. e. bud scale scar.
The tendency of molecules of the same kind to stick together is called ________
A) bonding B) cohesion C) polarity D) adhesion
The process of clonal deletion is designed to
A) Destroy clones of lymphocytes able to react to self molecules. B) Slow down the immune system in the elderly. C) Slow down the primary immune response to an antigen. D) Limit the number of lymphocyte clones an individual has in order to make the system more efficient. E) Slow down the secondary immune response to an antigen.