In response to a high fat content in chyme, the duodenum releases ____
a. gastrin
b. somatostatin
c. CCK
d. secretin
e. GIP
ANSWER: c
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Helicobacter pylori appears to have some connection with
A. acid reflux disease. B. ulcers. C. dental caries. D. stomach cancer. E. ulcers AND stomach cancer
An example of a single-gene trait that distinguishes humans from other primates is
A) the presence of two sides to the brain. B) the abundance of fetal hemoglobin in humans. C) the lack of adult hemoglobin in marmosets and lemurs. D) our non-opposable thumbs.
All of the following are tenets of the cell
theory EXCEPT that a. all organisms consist of one or more cells. b. the cell is the smallest unit that retains the characteristics of life. c. since the first cell, each new cell is descended from previous cells. d. each cell is composed of products that it manufactures. e. cells may arise spontaneously under certain laboratory conditions
Catastrophic destructions, like the one caused by the impact of a bolide with earth at the end of the Cretaceous, create opportunities for new types of biological associations. In the case of the end-Cretaceous catastrophe:
A) mammals and birds filled ecological vacancies left by dinosaurs. B) ammonites filled ecological vacancies left by trilobites. C) conifers filled ecological vacancies left by large primitive trees and ferns. D) humans quickly became the dominant species on the planet.