In excreted urine, a reliable "marker" that a pregnancy has initiated is
A) progesterone.
B) estrogen.
C) follicle-stimulating hormone.
D) chorionic gonadotropin.
E) hypothalamic-releasing hormones.
Answer: D
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Biology
- During the early part of the cleavage stage in frog development, the rapidly developing cells
- As cleavage continues during frog development, the size of the blastomeres
- The pattern of embryonic development in which only the cells lacking yolk subsequently undergo cleavage is called
- Among these choices, the largest cell involved in frog reproduction is
- In a developing frog embryo, most of the yolk is
- At the moment of sperm penetration, human eggs
- A human blastomere is
- Compared to sea urchin eggs, those of mammals
- In mammalian eggs, the receptors for sperm are found in the
- Fertilization normally
- In mammals, the nuclei resulting from the union of the sperm and the egg are first truly diploid at the end of the
- In an egg cell treated with EDTA, a chemical that binds calcium and magnesium ions, the
- In sea urchins, the "fast block" and the longer lasting "slow block" to polyspermy, respectively, are
- The cortical reaction functions directly in the
- From earliest to latest, the overall sequence of early development proceeds in which of the following sequences?
- In a newly fertilized egg, the vitelline layer
- The vitelline layer of the sea urchin egg
- During fertilization, the acrosomal contents
- Contact of a sea urchin egg with signal molecules on sperm causes the egg to undergo a brief
- A reproductive difference between sea urchins and humans is
- A human zygote undergoes its first cell division
- A sea urchin zygote undergoes its first cell division
- The formation of the fertilization membrane requires an increase in the availability of
- Even in the absence of sperm, metabolic activity in an egg can be artificially activated by
- Contact of a sperm with signal molecules in the coat of an egg causes the sperm to undergo
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