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

Biology & Microbiology

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Many organisms used in modern agriculture are a result of artificial selection

Indicate whether the statement is true or false

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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

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology