Describe how fishes are able to extract oxygen from water
What will be an ideal response?
Countercurrent exchange occurs as water flows over the gill filaments. This ensures that the incoming water is always flowing past capillaries with a lower oxygen concentration.
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A person who inherits an extra X chromosome will have
A. Klinefelter syndrome. B. Turner syndrome. C. Down syndrome. D. Polyploid syndrome. E. Edward syndrome.
Induced pluripotent stem cells are ____
a. produced from normal body cells b. not used for human genetic research c. a major cause of cancer d. grown in the lab to produce clones e. isolated from embryos
What is a hybrid zone?
a. an area where no hybrids exist b. an area where two populations may breed and produce inviable, fertile offspring c. an area where two populations may breed and produce inviable, infertile offspring d. an area where two populations may breed and produce viable, fertile offspring e. an area where two populations may breed and produce viable, infertile offspring
The Cl- ion has a single negative charge and the atomic number of 17. How many electrons are on its innermost shell?
A) 18 B) 17 C) 9 D) 2