Which of the molecules is polar and acts like a base?
A. R-NH2
B. R-CO-R
C. R-OH
D. R-PO4
E. R-SH
A. R-NH2
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Which of the following statements about essential nutrients are true? Essential nutrients _____
I) are necessary for plant growth and reproduction II) are required for a specific structure or metabolic function III) cannot be synthesized by a plant IV) are produced by symbiotic bacteria A) I and IV B) II, III, and IV C) I, II, and III D) I, II, III, and IV
A paleontologist estimates that when a particular rock formed, it contained 12 mg of the radioactive
isotope potassium-40, which has a half-life of 1.3 billion years. The rock now contains 3 mg of the isotope. About how old is the rock?
a. 2.6 billion years b. 5.2 billion years c. 1.3 billion years d. 0.3 billion years e. 0.4 billion years
What happens during the cotransport of glucose and sodium ions?
a. The transport of glucose powers the transport of sodium. b. ATP causes a conformational change in the carrier protein. c. Both D and E d. Glucose molecules are transported against their concentration gradient. e. Sodium ions are transported against their concentration gradient.
What is chemical bonding? Explain the differences between covalent and ionic bonding
What will be an ideal response?