The vegetal pole of a frog zygote differs from the animal pole in that _____
A) the vegetal pole has a higher concentration of yolk
B) the blastomeres originate only in the vegetal pole
C) the vegetal pole cells undergo mitosis, but not cytokinesis
D) the polar bodies bud from this region
A
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A(n) ________ forms during cytokinesis as contractile filaments in the cell tighten
Fill in the blank(s) with correct word
Which of the following statements about sexually transmitted diseases is true?
a. Nearly all STDs have severe and obvious ongoing symptoms. b. STDs are annoying and uncomfortable but they are never fatal. c. STDs can be transmitted through the mouth or the anus.
A nitrogenous base composed of two rings is a (purine/pyrimidine/ribose)
What will be an ideal response?
Which of the following sections of the mammalian nephron is incorrectly paired with its function?
a. Bowman's capsule and glomerulus - filtration of blood b. Descending limb of loop of Henle - diffusion of urea out of the filtrate c. Proximal tubule - secretion of toxins and H+ into the filtrate and transport of glucose and amino acids out of tubule d. Ascending limb of loop of Henle - diffusion and pumping of NaCl out of the filtrate e. Distal tubule - regulation of pH and K+