Which example is most clearly a case of density-dependent population regulation?
A) the summer drying of savanna grass for an insect that feeds on grass sap
B) a dangerous new flu strain that is transmitted among humans by sneezing
C) the first hard frost of fall for a population of annual morning glory vines
D) the occurrence of rainstorms for an opportunistic desert annual
Answer: B
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Where does the lens FOCUS an image in the mammalian eye?
a. on the retina, using the entire surface of the retina b. primarily on the fovea c. on the rods only d. slightly in front of the retina, so the neural cells don't distort the image e. it depends on where you are looking; sometimes on the fovea, sometimes elsewhere on the retina
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
Transcription is the ________
A) manufacture of a strand of RNA complementary to a strand of DNA B) manufacture of two new DNA double helices that are identical to an old DNA double helix C) modification of a strand of RNA prior to the manufacture of a protein D) manufacture of a protein based on information carried by RNA
A prolonged period without rain is causing a major drought in the American Midwestern states. How would you expect crops to respond initially to the stress caused by the drought?
A. They will take in more carbon dioxide. B. They will release more oxygen. C. They will take in less carbon dioxide. D. They produce fewer secondary metabolites. E. They will increase rates of photosynthesis.