A simple nervous system _____
A) must include chemical senses, mechanoreception, and vision
B) includes a minimum of twelve effector neurons
C) has information flow in only one direction: away from an integrating center
D) includes sensory information, an integrating center, and effectors
D
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What is the difference between Ras and the G proteins bound to G protein coupled receptors (GPCRs)?
A. Ras is an enzyme and the G proteins bound to GPCRs are not enzymes. B. Ras is a second messenger and the G proteins bound to GPCRs are not second messengers. C. Ras is a small G protein and the G proteins bound to GPCRs are not small G proteins. D. Ras can activate different effector molecules and the G proteins bound to GPCRs cannot activate different effector molecules.
All chordates have a notochord, a postanal tail, segmental body wall muscles, a dorsal, hollow nerve cord, and a perforated pharynx
1.True 2.False
Skeletal muscles produce movement by pulling on __________, which attach to bones
a. tendons b. ligaments c. cross bridges d. articulations e. sarcomeres
The embryonic germ layer of tissue in animals that develops into the digestive tract and organs derived from the digestive tract is the
A. pachyderm. B. ectoderm. C. mesoderm. D. endoderm. E. protoderm.