Which of the following represents the proper order of events in embryonic development?
A. fertilization; gastrulation; neurulation; cleavage; organogenesis
B. fertilization; gastrulation; cleavage; neurulation; organogenesis
C. fertilization; cleavage; gastrulation; neurulation; organogenesis
D. fertilization; gastrulation; cleavage; organogenesis; neurulation
E. fertilization; cleavage; gastrulation; organogenesis; neurulation
Answer: C
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Which embryonic structure ultimately forms the digestive tract?
A. archenteron B. blastopore C. blastocoel D. notochord E. convergence extension
What are the possible phenotypes of the children if the mother's genotype is IAi for blood type and the
father is IBi? (Use the Punnett square to verify your answer.) a. all AB b. A, B c. A, AB d. A, B, O e. A, B, AB, O
If the membrane represented in the graph was stimulated in the presence of a drug that specifically inhibits sodium channels, the membrane would
A) not depolarize. B) depolarize for one stimulus but not for a second stimulus. C) depolarize but not repolarize. D) repolarize only to the threshold potential. E) become permanently hyperpolarized.
Within the fluid mosaic of a plasma membrane, what is the role of transport and channel proteins?
A) They identify the cell. B) They may set off cellular changes such as cell division or hormone secretion. C) They prevent the passage of amino acids. D) They are cell-surface connection sites. E) They permit ions and water molecules to move through the plasma membrane.