Frozen water is more dense than liquid water
Indicate whether the statement is true or false
F
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Several species of sea urchins may inhabit the same tide pool and their reproductive periods overlap. Although they practice external fertilization, they seldom interbreed because eggs produce chemicals that are only attractive to sperm of their own species. This is an example of a _________ barrier that _______________.
A. prezygotic; causes geographic isolation B. prezygotic; causes temporal isolation C. prezygotic; prevents gamete fusion D. postzygotic; prevents zygote fusion E. postzygotic; causes hybrid infertility
Fumarate production is an oxidation reaction similar to the reactions that produce ?-ketoglutarate, and oxaloacetate, but with one key difference. What is it?
a. Fumarate production releases a water molecule. b. Carbon dioxide is released in this reaction. c. This reaction reduces FAD instead of NAD+. d. Fumarate production occurs twice per cycle.
The molar mass of glucose is 180 grams per mole (g/mol). Which of the following procedures should you carry out to make a 1 M solution of glucose? Into 0.8 liter (L) of water, dissolve _____
A) 1 g of glucose and then add more water until the total volume of the solution is 1 L B) 18 g of glucose and then add more water until the total volume of the solution is 1 L C) 180 g of glucose and then add 0.2 L more of water D) 180 g of glucose and then add more water until the total volume of the solution is 1 L
Which best statement describes an element?
a. A substance that cannot burn. b. A substance that is soluble in both acid and base c. A substance that is held together by covalent bonds d. A substance that is composed of more than one kind of atom e. A substance that cannot be broken into simpler substances by chemical reactions