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 choices is NOT TRUE?
a. Carotenoids use yellow and red light to assist in photosynthesis. b. Carotenoids are accessory pigments that capture certain energy from light and transfer it to chlorophyll a. c. The presence of carotenoids in a leaf is masked by the presence of chlorophyll throughout the growing season. d. Carotenoids absorb blue and violet wavelengths and reflect red, orange, and yellow. e. Both carotenoids and anthocyanins reflect red wavelengths.
Organisms have been created by nuclear transfer cloning, in which a diploid nucleus from a somatic cell of an adult animal is injected into an enucleated egg cell to create an embryo
Among the many species thus cloned, there has been a prevalence of mitochondrial defects. Which of the following is the most likely explanation? A) The transferred nucleus may destroy the egg mitochondria. B) The egg cell may be heteroplastic before injection. C) The somatic cell's mitochondria may have been transferred as well. D) The transferred nucleus may have mutations that alter mitochondrial function. E) The egg nucleus may have had one or more mutations that alter mitochondrial function.
All cells have some characteristics in common; both prokaryotic and eukaryotic cells have
A) a nucleus and a cell membrane B) DNA and a cell membrane C) cytoplasm, a plasma membrane, and a nucleus D) cytoplasm, a plasma membrane, and DNA E) a cell membrane and cytoplasm
Suppose that a genetics researcher concludes that the probability of obtaining a double dominant phenotype in an F2 cross is 9/16. This conclusion can be valid only if one or more assumptions are true. Which of the following is a necessary assumption?
A: Alleles have an equal probability of separating into gametes. B: The two genes assort independently. C: The sample size is small. D: Both a and b E: Both b and c