Which molecules are broken down by trypsin, elastase, and chymotrypsin?
a. lipids
b. proteins
c. peptides
d. amino acids
c. peptides
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Which statement is true?
a. Feathers are waterproof because they secrete cellulose. b. Trabeculae are small bones found in the wings. c. Both beaks and feathers are composed of keratin. d. Feathers help to radiate excess body heat.
A_____ infection is an infection that occurs as a complication of a pre-existing one
Fill in the blank(s) with the appropriate word(s).
Genes for self-incompatibility usually inhibit the:a
production of pollen grains. b. pollination. c. growth of the pollen tube. d. growth of the style. e. microspore formation.
Which of the following is NOT considered a hypersensitivity reaction?
A) a rash caused by poison ivy B) immune system attack on the thyroid gland C) itchy eyes and a runny nose in a dusty environment D) dermatitis at the site of a metal watchband E) breaking into hives after eating strawberries