The genotype of a tall, yellow pea plant is TtYy. How many different types of gametes can this individual produce if the tall and yellow genes are on different chromosomes?
A) 1
B) 2
C) 4
D) 5
E) 8
Answer: C
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What is the single unique characteristic that distinguishes extant birds from other extant vertebrates?
A) endothermy B) feathers C) an amniotic egg D) flight E) a four-chambered heart
A bacterium that you isolated from pond water appears to use light for energy. Based upon this information, you inoculate the organism into fresh media, infused with lots of carbon dioxide. Even after incubation at the correct temperature (of pond water), the organism is not growing. Your best explanation of what might have happened is
A. there was no sulfur compound added to the medium, that could be used as an electron donor. B. there is some inhibitory chemical that is preventing the growth of the bacterium. C. you were using the wrong type of sunlight as the energy source for the bacterium. D. no oxygen was added to the medium so the organism died.
Which event occurred first?
a. evolution of vascular plants b. evolution of modern humans c. oxygen accumulation in the Earth's atmosphere d. evolution of prokaryotes e. evolution of reptiles
Which of the following is (are) characteristic of
arteries? a. rapid transport vessels b. large diameter c. pressure reservoirs d. low resistance vessels e. all of these