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
Answer: B
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Many organisms used in modern agriculture are a result of artificial selection
Indicate whether the statement is true or false
In C3 plants, the __________ are typically closed at night and open during the daytime to allow for gas
exchange. a. stomata b. epidermis c. spongy mesophyll d. grana e. cuticles
Which curves on the graphs may represent the temperature and pH profiles of an enzyme taken from a bacterium that lives in a mildly alkaline hot springs at temperatures of 70°C or higher?
A) curves 1 and 5 B) curves 2 and 5 C) curves 3 and 4 D) curves 3 and 5
Select the best response to the question. ?What is the purpose of a simple stain?
A) To identify gram-positive bacteria. B) To provide additional information about the cell based on the composition of the cell wall. C) To identify gram-negative bacteria. D) To provide contrast to better illustrate the structure and arrangement of bacterial cells.