Q: A solution has a pH of 3. What is the $$[\mathrm{H}^+]$$ concentration in this solution?

$$[\mathrm{H}^+] = 1 \times 10$$^{-3}$$ 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 is testing the effect of a new fertilizer on plant growth. She sets up two groups: one receives the fertilizer, the other does not. Which group is the control group?

Accepted Answer

The group that does not receive the fertilizer.

Question 4

Which of the following statements about hypotheses and scientific theories is correct?

Accepted Answer

A theory is broader in scope and supported by more evidence than a hypothesis.

Question 5

In the chemical reaction $$4\mathrm{NH}_3 + 5\mathrm{O}_2 \rightarrow 4\mathrm{NO} + 6\mathrm{H}_2\mathrm{O}$$, how many molecules of water are produced when 4 molecules of ammonia react completely?

Accepted Answer

6

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 at one end and a partial positive charge at the other.

Question 7

A solution has a pH of 3. What is the $$[\mathrm{H}^+]$$ concentration in this solution?

Accepted Answer

$$[\mathrm{H}^+] = 1 	imes 10$$^{-3}$$ M

Question 8

Which type of chemical bond is the strongest in water?

Accepted Answer

Covalent bond

Question 9

Which of the following is an example of a hydrophobic substance?

Accepted Answer

Vegetable oil

Question 10

If a fluid has a pH between 7.1 and 14, how would you classify it and what type of ions would it have more of?

Accepted Answer

Basic; more $$\mathrm{OH}^-$$ ions

Question 11

Which of the following chemical groups is most likely to act as an acid in biological molecules?

Accepted Answer

Carboxyl group ($$-\mathrm{COOH})$$

Question 12

Which macromolecule is shown in a model with alpha helices and beta sheets, and what level of protein structure do these features represent?

Accepted Answer

Protein; secondary structure

Question 13

What does it mean when DNA strands are described as antiparallel?

Accepted Answer

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

Question 14

How many different DNA sequences of eight bases can be made, assuming four possible bases at each position?

Accepted Answer

$$4^8$$

Question 15

Which of the following best describes the difference between a nonpolar covalent bond and a polar covalent bond?

Accepted Answer

Nonpolar covalent bonds involve equal sharing of electrons, while polar covalent bonds involve unequal sharing.

Question 16

Which element is typically the most electronegative among organic molecules?

Accepted Answer

Oxygen

Question 17

Which property of water allows it to moderate Earth's climate by absorbing and releasing heat slowly?

Accepted Answer

High specific heat

Question 18

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

Accepted Answer

Cellulose

Question 19

If a solution has $$[\mathrm{H}^+] = 1 	imes 10$$^{-10}$$ M, what is its pH?

Accepted Answer

pH = 10

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

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