The function of cortical granules is to...
A. create a fertilization envelope
B. stimulate egg mitosis
C. determine the ventral surface of embryo
D. form the blastocoel
Ans: A. create a fertilization envelope
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Which of the following is the correct order of the three major forms of nitrogenous waste listed from highest amount of water required for excretion to lowest amount of water required for excretion?
A. ammonia, urea, uric acid B. ammonia, uric acid, urea C. urea, ammonia, uric acid D. urea, uric acid, ammonia E. uric acid, urea, ammonia
In a frog embryo, gastrulation
A. produces a blastocoel displaced into the animal hemisphere. B. occurs along the primitive streak in the animal hemisphere. C. is impossible because of the large amount of yolk in the egg. D. proceeds by invagination and involution as cells roll over the dorsal lip of the blastopore. E. occurs within the inner cell mass that is embedded in the large amount of yolk.
Which of the following statements about homologous chromosomes is false?
1.One member of a homologous pair is inherited from the mother and the other is inherited from the father. 2.Homologues have identical gene loci but may carry differing alleles. 3.Sister chromatids separate in Meiosis I and homologous chromosomes separate in Meiosis II. 4.During meiosis I, chromatids of each homologous pair often exchange segments by crossing over. 5.None of the choices
In _________ diabetes, glucose levels remain higher than normal
Fill in the blank(s) with the appropriate word(s).