A carbon atom with six protons, seven neutrons, and six electrons has a mass number of

a. 6.
b. 7.
c. 12.
d. 13.
e. 19.


D

Biology & Microbiology

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The typical carbon atom is described in the periodic table by the accompanying box. How many protons are in a typical oxygen atom?

A. 12 B. 8 C. 18 D. Not enough information given

Biology & Microbiology

Many closely related duck species exhibit ____, the dramatic variation in the appearance of males but not females,

which is an almost certain sign of ____.

a. asexual reproduction; sexual selection b. asexual reproduction; artificial selection c. sexual dimorphism; sexual selection d. sexual dimorphism; artificial selection e. sexual uniformitarianism; sexual selection

Biology & Microbiology

Which of the following can be used by humans as an energy source?

a. chitin b. amino acids c. cellulose d. RNA

Biology & Microbiology

Bones are held together at joints by

a. tendons. b. intercellular junctions. c. ligaments. d. cartilage. e. collagen.

Biology & Microbiology