Where in the brain is the corpus callosum?
a. between the cerebellum and the medulla
oblongata
b. below the cerebellum
c. between the two hemispheres of the
cerebrum
d. between the pons and the midbrain
e. between the thalamus and the
hypothalamus
C
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What does a gametophyte produce?
A. Diploid gametes B. Haploid spores C. Diploid spores D. Haploid gametes
What did Charles Darwin propose after observing the 11-inch-long nectaries of the Angraecum sesquipedale orchid in Madagascar?
A. that the orchid was an evolutionary dead end and could no longer reproduce B. the existence of a pollinator moth with a proboscis of 10–11 inches C. the presence of very small bees that can fit into a long nectar tube D. that the orchid must reproduce asexually E. that the orchid was a self-pollinator and required no assistance from an organism
Suppose a group of researchers analyzed a new species of flowering plant. In this species, flower color is determined by two genes. They crossed a truebreeding red-flowered stock with a truebreeding white-flowered stock. They then crossed the F_1 offspring together and analyzed the next generation. Upon examining the flower color, they found that the F_2 generation contained 178 purple, 60 red, and 80 white flowers. What genetic term best describes the inheritance pattern of flower color for this species?
a. genes in one pathway b. no gene interaction c. dominant epistasis d. recessive epistasis
What might be the advantage to a cell if it assimilated a photosynthetic bacterium rather than digesting it?
A) It could now utilize hydrogen sulfide as an energy source. B) It could now use sunlight to make its food. C) It could now live in an oxygen-free environment. D) It could now use glucose as an energy source.