Where does chemical digestion first begin in the body?

a. The mouth
b. The esophagus
c. The bolus
d. The stomach


a. The mouth

Chemical digestion in the body first begins in the mouth where salivary glands release enzymes to break down starches and fats.

Biology & Microbiology

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Transpiration results from

a. the polar nature of water molecules. b. the drying power of air. c. cohesion-tension forces. d. photosynthesis. e. all of these.

Biology & Microbiology

Which of the following is an example of an

interacting effect causing a decline in a species? a. habitat loss of the polar bear b. dodo birds being hunted by sailors c. pollution buildup in the eggs of eagles d. decline in buffalo causing a drop in native clover e. all of these

Biology & Microbiology

The neuropeptide neurotransmitters are involved in:

a. pain regulation. b. stimulation of skeletal muscle. c. inhibition of acetylcholine receptors. d. mood regulation. e. release of hormones

Biology & Microbiology

Which one of the following produces the most potent exotoxin?

A) Bordetella pertussis B) Corynebacterium diphtheriae C) Mycobacterium tuberculosis D) Streptococcus pyogenes E) Streptococcus pneumoniae

Biology & Microbiology