Which of the following accurately describes the structure of fibrous proteins?
A) Fibrous proteins usually contain a number of different domains with different structural motifs.
B) Fibrous proteins are composed of an equal mixture of ? helices and ? sheets with interconnecting looped segments.
C) Fibrous proteins have an extensive tertiary and quaternary structure that affects the strength and elasticity of each fiber.
D) Fibrous proteins have a simple primary structure and very little secondary structure, resulting in long, thin fibers.
E) Fibrous proteins are usually composed of either ? helices or ? sheets throughout the molecule, giving them a highly ordered, repetitive structure.
Answer: E
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Fill in the blank with the appropriate word.
Flatworms (Platyhelminthes) are ________ and typically have ________
A) radially symmetrical; no digestive system B) bilaterally symmetrical; a gastrovascular cavity with one opening C) bilaterally symmetrical; a complete digestive tract with a mouth and anus D) all parasites; no digestive system
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Which type of tissue makes up the epidermis?
A. adipose tissue B. dense fibrous connective tissue C. stratified squamous epithelium D. loose connective tissue E. elastic fibers