Describe the shared derived characteristics that support grouping the hemichordates, chordates, and echinoderms
together as deuterostomes. What will be an ideal response?
Shared derived characteristics that support grouping the hemichordates, chordates, and
echinoderms together as deuterostomes are similarities in patterns of development as
illustrated by radial, indeterminate cleavage and blastopore development into an anus not
mouth
Shared derived anatomical characteristics include endoskeletons and true coeloms.
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Why is a reflex arc so fast?
A. because all the neurons involved are myelinated B. because the axons are shorter C. because the afferent and efferent cells are in the spinal cord D. because there are fewer cells involved in the network
A cDNA library differs from a genomic DNA library in which way?
A. It consists solely of RNA molecules B. It contains many copies of the gene of interest C. It contains only coding sequences, not introns D. It is typically 10-100 times the size of a DNA library
If an individual for whatever reason cannot
pass on its genes to offspring, the best alternative is to show altruism to a. relatives. b. strangers. c. neighbors. d. other species. e. competitors.
Four of the five answers listed below are events associated with the aging process. Select the
exception. a. skin wrinkling b. increased metabolism c. decreased muscle mass d. altered collagen e. increased fat deposition