Each carbon atom can share pairs of electrons with as many as ____ other atoms
a. two
b. three
c. four
d. five
e. six
ANSWER: c
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Each year, plants and algae remove approximately _______ of the CO2 in the atmosphere.
A. half B. 100% C. 1/7th D. 50% E. 1/50th
Cell surface markers involved in immune reactions
A. are the result of genetic expression. B. aid in cellular development. C. receive and transmit chemical messages among other cells of the system. D. function in recognition of self molecules. E. All of the choices are correct.
The hindbrain includes the
a. thalamus. b. pineal gland. c. cerebellum. d. medulla oblongata. e. cerebellum and medulla oblongata.
Research has shown that certain body cells, known as stem cells, can develop into a variety of specialized cells. Various factors can cause stem cells to develop into different types of mature cells. These different types of mature cells result from
A. different antibodies and mitotic cell division B. identical genetic codes and meiotic cell division C. different environments of the cells and the functioning of different parts of the genetic code D. similar steps in the development of the cells and a reduction in the number of chromosomes in each cell