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

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

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.

Biology & Microbiology

What is chemical bonding? Explain the differences between covalent and ionic bonding

What will be an ideal response?

Biology & Microbiology