Root hairs absorb nutrients from soil against the nutrient concentration gradient. To achieve this, root hairs use _____.
a. proton pumps
b. facilitated diffusion
c. direct diffusion
d. osmosis
Ans: a. proton pumps
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The modern synthesis is based on all of the following EXCEPT
a. linking microevolution and macroevolution b. linking Darwinism with Mendelism c. a focus on population genetics d. linking population growth with variation to explain natural selection e. interpreting data from a wide variety of biological disciplines in an evolutionary framework
As a patch increases in size, the ratio of interior to edge increases
Indicate whether the statement is true or false
Where is thyrotropin-releasing hormone (TRH) made?
A) anterior pituitary B) posterior pituitary C) follicular cells of the thyroid gland D) hypothalamus
According to the theory of sea-floor spreading, oceanic islands, such as the Hawaiian Islands depicted in the figure above, form as oceanic crustal plates move over a stationary "hot spot" in the mantle
Currently, the big island of Hawaii is thought to be over a hot spot, which is why it is the only one of the seven large islands that has active volcanoes. What should be true of the island of Hawaii? 1. Scientists in search of ongoing speciation events are more likely to find them here than on the other six large islands. 2. Its species should be more closely related to those of nearer islands than to those of farther islands. 3. It should have a rich fossil record of terrestrial organisms. 4. It should have species that are not found anywhere else on Earth. 5. On average, it should have fewer species per unit surface area than the other six islands. A) 1, 2, and 3 B) 1, 2, and 5 C) 1, 2, 3, and 4 D) 1, 2, 4, and 5