One of the main reasons that we exhale a higher percentage of carbon dioxide than we inhale is
A. we use carbon dioxide to make glucose.
B. we produce carbon dioxide as a by-product of aerobic respiration.
C. we produce carbon dioxide as a by-product of transmission of nerve impulses across synapses.
D. carbon dioxide is a by-product of photosynthesis.
E. carbon dioxide dissolves better in blood than does oxygen.
B. we produce carbon dioxide as a by-product of aerobic respiration.
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Cells become progressively organized into recognizable structures through a process known as:
a. morphogenesis. b. determination. c. cell differentiation. d. nonspecific differentiation. e. growth.
In saltatory conduction, nerve impulses jump from one exposed region of the axon to another. This exposed region is called the ________
A) motor end plate B) node of Ranvier C) Schwann cell gap D) interneurons
A mutation that deletes (removes) the consensus sequence in the -35 region of bacterial promoters would most likely result in?
a. an increase in the amount of transcription b. a decrease in the amount of transcription c. no change in the amount of transcription d. increased binding of RNA polymerase to the promoter
Compared to unicellular organisms, cells of multicellular organisms have
A. fewer functions B. thicker membranes C. larger nuclei D. less variation