Twins produced when a single egg is fertilized are called ________ twins. Twins produced from two eggs ovulated at the same time are called ________ twins
A) monozygotic; identical
B) dizygotic; monozygotic
C) dizygotic; nonidentical
D) nonidentical; identical
E) monozygotic; dizygotic
E
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Which of the folllowing lists the stages or structures of prenatal development in the correct order?
A. Cleavage, zygote, morula, blastocyst, embryo, fetus B. Zygote, morula, blastocyst, cleavage, embryo, fetus C. Zygote, cleavage, morula, blastocyst, embryo, fetus D. Zygote, embryo, morula, blastocyst, cleavage, fetus E. Embryo, zygote, blastocyst, cleavage, morula, fetus
Typically, the ____________________ renal artery branches off the abdominal descending aorta first.
Fill in the blank(s) with the appropriate word(s).
Leslie has a bad sore throat and the lymph nodes in her neck are swollen. This indicates __________.
A) the affected lymph nodes contain an increased number of lymphocytes. B) lymph is not flowing through these lymph nodes. C) the lymph gland has increased its secretion of thymosin. D) the focus of the infection is the lymph nodes.
Select the best explanation for why protease enzymes are secreted in inactive forms
A) Inactive enzymes will simply be expelled with the feces if no protein is present in the digesting food, this will help to conserve energy. B) The immunoglobulins protecting the digestive tract would be digested without proper regulation of protein digesting enzymes. C) The enzymes would digest each other if they were not properly regulated. D) The cells producing inactive enzymes are themselves protected from the enzymes until they are safely within the lumen of the GI tract.