Q: A solution has a pH of 4. What is the concentration of hydrogen ions $$[H^+] in $$the solution?

$$[H^+] = 10$$^{-4}$$ \text{ M}$$

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 as complexity increases.

Question 2

Which level of biological organization is defined as all living things in a particular area, along with all the nonliving components of the environment?

Accepted Answer

Ecosystem

Question 3

Which of the following statements about DNA is correct?

Accepted Answer

DNA contains genes, which are units of inheritance that encode information for building proteins.

Question 4

Which of the following is an example of negative feedback in biological systems?

Accepted Answer

The regulation of blood glucose levels by insulin.

Question 5

Which domain includes all prokaryotic organisms that are mostly single-celled and lack a nucleus?

Accepted Answer

Bacteria and Archaea

Question 6

Which of the following best explains why water has a high specific heat?

Accepted Answer

Hydrogen bonds between water molecules absorb heat when they break and release heat when they form.

Question 7

A solution has a pH of 4. What is the concentration of hydrogen ions $$[H^+] in $$the solution?

Accepted Answer

$$[H^+] = 10$$^{-4}$$ 	ext{ M}$$

Question 8

Which of the following is a property of carbon that makes it essential for life?

Accepted Answer

Carbon can form covalent bonds with up to four other atoms.

Question 9

Which of the following best describes the difference between covalent and ionic bonds?

Accepted Answer

Covalent bonds involve the sharing of electron pairs, while ionic bonds involve the transfer of electrons.

Question 10

Which of the following is an example of a controlled experiment?

Accepted Answer

Comparing plant growth with and without fertilizer, keeping all other conditions the same.

Question 11

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

Accepted Answer

$$pH = -\log [H^+]$$

Question 12

Which of the following best describes the process of gene expression?

Accepted Answer

The process of converting information from a gene to a cellular product, such as a protein.

Question 13

Which of the following is a real-world example of an emergent property?

Accepted Answer

A functioning heart that can pump blood, which is not a property of individual heart cells.

Question 14

Which of the following is a characteristic of a hypothesis in the scientific method?

Accepted Answer

It must be testable and falsifiable.

Question 15

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

Accepted Answer

Hydrogen bonds keep water molecules farther apart in ice, making it less dense than liquid water.

Question 16

Which of the following is true about buffers in biological systems?

Accepted Answer

Buffers minimize changes in the concentrations of $$H^+$$ and $$OH^- in a $$solution.

Question 17

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

Accepted Answer

The bond between oxygen and hydrogen in a water molecule.

Question 18

Which of the following best describes the difference between discovery science and hypothesis-driven science?

Accepted Answer

Discovery science is mostly about describing nature, while hypothesis-driven science is about explaining nature.

Question 19

Which of the following is the correct balanced equation for the synthesis of ammonia ($$NH_3) $$from nitrogen and hydrogen?

Accepted Answer

$$3H_2 + N_2$ \rightarrow 2NH_3$$

Question 20

Which of the following is a correct statement about the unity and diversity of life?

Accepted Answer

All living things share a common genetic code.

General Biology: Foundations, Chemical Context, Water, and Carbon

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