A pollination syndrome is:
A. the synchronous release of pollen by many individuals of wind-pollinated trees
B. specializations of plants that attract a specific kind of pollinator
C. the simultaneous release of two sperm, one to affect fertilization and the other to initiate formation of endosperm
D. a brushlike tongue of hummingbirds to which pollen adheres
E. a series of bristles on the backs of insects to which pollen adheres
B. specializations of plants that attract a specific kind of pollinator
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Which of the following statements is NOT true of Chondrichthyans?
A. They have internal fertilization. B. They were the first vertebrates to develop teeth. C. Their buoyance is maintained partly by the oil in their livers. D. They are color blind. E. Their teeth are composed of dentine and enamel whereas the scales are made of chitin.
Which of the following completes its life cycle by infecting a mosquito and a vertebrate?
a. Plasmodium falciparum b. Trypanosoma brucei c. Trypanosoma cruzi d. Plasmopara viticola
A person chokes when food becomes lodged in
a. the esophagus. b. the trachea. c. the larynx. d. the sinus. e. none of these
The human disease Nijmegen breakage syndrome results from mutations in genes related to
a. nucleotide excision repair. b. double-strand break repair pathways. c. photoreactivation. d. base excision repair. e. mismatch repair.