Q: A solution has a pH of 9. What is the $$[\mathrm{H}^+]$$ concentration in this solution?

$$[\mathrm{H}^+] = 1 \times 10$$^{-9}$$ \ \mathrm{M}$$

Question 1

Which of the following best describes an emergent property in biological systems?

Accepted Answer

A property that arises only when individual parts interact within a higher level of organization.

Question 2

Which of the following is the correct order of biological organization from largest to smallest?

Accepted Answer

Biosphere, Ecosystem, Community, Population, Organism

Question 3

A scientist hypothesizes that a new fertilizer will increase plant growth. Which of the following is the best example of a dependent variable in this experiment?

Accepted Answer

The height of the plants measured after two weeks

Question 4

In a chemical reaction, which law states that matter is neither created nor destroyed?

Accepted Answer

Law of Conservation of Matter

Question 5

Balance the following chemical equation: $$4 \mathrm{NH}_3 + 5 \mathrm{O}_2 \rightarrow \mathrm{NO} + \mathrm{H}_2\mathrm{O}. $$What are the correct coefficients for NO and H$$_2O$$?

Accepted Answer

$$4 \mathrm{NO}$$ and $$5 \mathrm{H}_2\mathrm{O}$$

Question 6

Which of the following best explains why water is considered a polar molecule?

Accepted Answer

The oxygen atom is more electronegative, creating a partial negative charge, while the hydrogen atoms have a partial positive charge.

Question 7

A solution has a pH of 9. What is the $$[\mathrm{H}^+]$$ concentration in this solution?

Accepted Answer

$$[\mathrm{H}^+] = 1 	imes 10$$^{-9}$$ \ \mathrm{M}$$

Question 8

Which of the following statements about hydrogen bonds in water is correct?

Accepted Answer

Hydrogen bonds allow water to have a high specific heat and surface tension.

Question 9

Which of the following molecules is most likely to be hydrophobic?

Accepted Answer

Cholesterol

Question 10

If a DNA molecule has 8 bases, how many different possible sequences can be made? (Assume 4 possible bases per position.)

Accepted Answer

$$4^8 = 65$$,536$$

Question 11

Which of the following best describes the antiparallel nature of DNA?

Accepted Answer

One strand runs 5' to 3', and the other runs 3' to 5'.

Question 12

Which of the following is NOT a property of water that supports life?

Accepted Answer

Ice is denser than liquid water

Question 13

Which element is the most electronegative among organic molecules?

Accepted Answer

Oxygen

Question 14

Which of the following best describes a control group in an experiment?

Accepted Answer

A group that is exposed to all variables except the one being tested

Question 15

Which of the following is the correct formula for calculating pH?

Accepted Answer

$$\mathrm{pH} = -\log_{10}[\mathrm{H}^+]$$

Question 16

Which of the following best explains the difference between a hypothesis and a scientific theory?

Accepted Answer

A hypothesis is a testable prediction, while a theory is a broad explanation supported by evidence.

Question 17

Which of the following is an example of a nonpolar covalent bond?

Accepted Answer

Bond between two oxygen atoms in O$$_2$$

Question 18

Which of the following macromolecules is shown by the presence of alpha helices and beta sheets?

Accepted Answer

Protein

Question 19

Which of the following is the most abundant organic compound on earth?

Accepted Answer

Cellulose

General Biology Study Guide: Themes, Chemistry of Life, and Biological Macromolecules

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