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.

Biology & Microbiology

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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

Biology & Microbiology

Compared to unicellular organisms, cells of multicellular organisms have

A. fewer functions B. thicker membranes C. larger nuclei D. less variation

Biology & Microbiology

Cells become progressively organized into recognizable structures through a process known as:

a. morphogenesis. b. determination. c. cell differentiation. d. nonspecific differentiation. e. growth.

Biology & Microbiology

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

Biology & Microbiology