Neural crest cells at the dorsal surface of the neural tube
A. form the notochord.
B. form the overlying ectoderm.
C. migrate to many different regions of the body.
D. differentiate into the brain.
E. control the segmentation of somatic mesoderm.
C. migrate to many different regions of the body.
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Why does water serve as an excellent solvent?
a. Because water is polar b. Because water is cohesive c. Because water allows surface tension d. Because water stabilizes temperatures
Which of the following leads to genetically diverse offspring?
a. External fertilization b. Fission c. Fragmentation d. Budding
Testosterone and estradiol are male and female sex hormones, respectively, in many vertebrates. In what way(s) do these molecules differ from each other? Testosterone and estradiol _____
A) are structural isomers but have the same molecular formula B) are cis-trans isomers but have the same molecular formula C) have different functional groups attached to the same carbon skeleton D) are enantiomers of the same organic molecule
Which statement about chemoreceptors is NOT true?
A. Chemoreceptors are thought to be the most primitive sensory receptor to have developed in animals. B. Chemoreceptors are universally found in animals. C. Chemoreceptors are found all over the body surface in humans. D. Chemoreceptors are concentrated on the auricles of the head in planaria. E. Chemoreceptors are found on antennae and mouthparts in insects and other arthropods.