Which of these structures is NOT formed during gastrulation?
a. Blastocoel
b. Archenteron
c. Endoderm
d. Mesoderm
e. Ectoderm
Answer: a. Blastocoel
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DNA is
a. composed of protein and lipid subunits. b. organized into functional units called genes. c. organized into functional units called chromosomes. d. organized into functional units called ribosomes. e. organized from information contained in proteins.
The ________ model assumes that evolution occurs in spurts, between which there are long periods of stasis with little evolutionary change.
What will be an ideal response?
The only endocrine gland whose secretory function is under direct control by sympathetic nerves is the:
a. pancreas b. thyroid c. adrenal medulla d. thymus e. testis
Which of the following is true concerning a morphological phylogenetic tree with 15 characters and 23 changes, and a molecular phylogenetic tree with 150 characters and 345 changes that contain the same taxa?
A. The molecular tree is a better estimate of the true relationships of the taxa. B. The molecular tree is the true representation of the relationships between the taxa. C. The morphological tree is the better estimate of the true relationships between the taxa because it has a shorter length. D. The morphological tree is the true representation of the relationships between taxa as it has the shorter length.