Which part of an antibody molecule contains the variable regions of a heavy and light chain that fold into a groove that will interact directly with and bind to a specific antigen?
A) Light chains
B) Fc end
C) Fab ends
D) Heavy chains
E) Disulfide bonds
C) Fab ends
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Which animals are typically osmoconformers?
a. freshwater teleost fishes b. sharks c. birds d. marine teleost fishes e. freshwater invertebrates
In Drosophila, sex determination is carried out by
A) a cascade of alternative splicing. B) the SRY gene. C) histone modification. D) the DMRT1 gene. E) All of these
During exhalation, air moves from the bronchi directly into the alveoli
____________________ Indicate whether the statement is true or false.
Why are C4 plants able to photosynthesize with no apparent photorespiration?
A) They do not participate in the Calvin cycle. B) They use PEP carboxylase to initially fix CO2. C) They conserve water more efficiently. D) They exclude oxygen from their tissues.