The fact that eggs have the ability to recognize surface proteins on sperm of their own species
illustrates
a. behavioral isolation.
b. gametic isolation.
c. hybrid breakdown.
d. hybrid inviability.
e. hybrid sterility.
B
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Antipodals and synergids are
A. produced in the female gametophyte. B. the result of double fertilization. C. what will fuse to form the endosperm. D. responsible for pollen tube formation. E. nonfunctional vestigal structures.
In transcription,
a. several amino acids are assembled by the messenger RNA molecules at one time. b. a special sequence, called a promoter, is necessary for transcription to begin. c. certain polypeptide sequences are governed by one ribosome, while other sequences are produced by other ribosomes. d. the transfer RNA molecules arrange the messenger RNA codons into the appropriate sequence. e. a special sequence, called an intron, is necessary for transcritpion to begin
Which ancestors of modern humans migrated out of Africa to populate the rest of the world?
a. Homo habilis b. Homo erectus c. Neanderthals d. Cro-Magnon e. Homo sapiens
The normal habitat of Clostridium tetani is
A. humans. B. animals. C. plants. D. soil and dust.