Base pairs in DNA are held together by _____ bonds.

A) Hydrogen
B) Sulfhydryl
C) Peptide
D) Polar covalent
E) Nonpolar covalent


A) Hydrogen

Biology & Microbiology

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Inorganic pollutants such as metals and radionuclides can be completely destroyed through bioremediation

Indicate whether the statement is true or false.

Biology & Microbiology

According to Darwin, natural selection is based on the ____ found in populations

a. acquired characters b. variations c. weakest members d. noncompetitors e. similarities

Biology & Microbiology

In your Ph.D. research, you use thin slices of brain tissue to study neuronal signaling. You attach an electrode to a single neuron, but cannot detect any activity. What is the most likely explanation?

A. Neurons are not electrically active; you should be recording neuroglia instead. B. Excessive myelination is blocking inputs to the cell. C. When you sliced the brain, you disconnected the cell from its dendrites. D. When you sliced the brain, you disconnected the cell from its neuroglia.

Biology & Microbiology

Which of the following layers forms the outer covering of the gastrointestinal tract?

a. serosa b. mucosa c. conjunctiva d. muscle layer e. submucosa

Biology & Microbiology