Q: If the pH of a solution is 9, what is the $$[\mathrm{H}^+]$$ concentration?

$$1 \times 10$$^{-9}$$\ \mathrm{M}$$

Question 1

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

Accepted Answer

A property that arises from the arrangement and interaction of parts within a system, such as consciousness arising from neural networks.

Question 2

A scientist is testing the effect of a new fertilizer on plant growth. She sets up two groups: one receives the fertilizer, and the other does not. Which is the control group, and why is it important?

Accepted Answer

The group that does not receive the fertilizer; it is important because it provides a baseline for comparison.

Question 3

Which of the following correctly matches the level of biological organization with its definition?

Accepted Answer

Population: A group of individuals of the same species living in a specific area.

Question 4

In a chemical reaction, which of the following statements is true according to the law of conservation of matter?

Accepted Answer

The number of atoms of each element is the same in the reactants and products.

Question 5

Balance the following chemical equation: $$4\mathrm{NH}_3 + 5\mathrm{O}_2 \rightarrow \_\_\_ + 6\mathrm{H}_2\mathrm{O}. $$What is the missing product?

Accepted Answer

$$4\mathrm{NO}$$

Question 6

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

Accepted Answer

It has an uneven distribution of electrons, resulting in partial positive and negative charges on opposite ends.

Question 7

If the pH of a solution is 9, what is the $$[\mathrm{H}^+]$$ concentration?

Accepted Answer

$$1 	imes 10$$^{-9}$$\ \mathrm{M}$$

Question 8

Which of the following best distinguishes between a covalent bond and an ionic bond?

Accepted Answer

A covalent bond involves the sharing of electron pairs between atoms, while an ionic bond involves the transfer of electrons from one atom to another.

Question 9

A solution has a $$[\mathrm{H}^+] of$$ $$1 	imes 10$$^{-13}$$\ \mathrm{M}. $$What is the pH of the solution?

Accepted Answer

13

Question 10

Which of the following is the most abundant organic compound on Earth and is a major component of plant cell walls?

Accepted Answer

Cellulose

Question 11

Which property of water allows it to moderate temperature in living organisms and environments?

Accepted Answer

High specific heat

Question 12

Which of the following best describes the difference between hydrophobic and hydrophilic substances?

Accepted Answer

Hydrophobic substances repel water, while hydrophilic substances are attracted to water.

Question 13

Which of the following best explains why ice floats on liquid water?

Accepted Answer

Ice is less dense than liquid water due to the hydrogen-bonded lattice structure.

Question 14

Which of the following is a correct statement about the relationship between pH and $$[\mathrm{H}^+]$$ concentration?

Accepted Answer

As pH decreases, $$[\mathrm{H}^+]$$ increases.

Question 15

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

Accepted Answer

The two strands run in opposite directions, with one strand oriented 5' to 3' and the other 3' to 5'.

Question 16

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

Accepted Answer

A hypothesis is a testable explanation for a specific observation, while a theory is a broad explanation supported by a large body of evidence.

Question 17

Which of the following is a dependent variable in an experiment testing the effect of fertilizer on plant height?

Accepted Answer

Plant height

Question 18

Which of the following best describes the role of buffers in biological systems?

Accepted Answer

Buffers help maintain a stable pH by accepting or donating $$\mathrm{H}^+$$ ions.

Question 19

Which of the following statements about the periodic table and elements in the human body is correct?

Accepted Answer

Four elements—oxygen, carbon, hydrogen, and nitrogen—make up approximately 96% of the human body.

General Biology I: Study Guide for Exam 1 (Chapters 1-5)

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