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

$$[H^+] = 1 \times 10$$^{-4}$$ \ M$$

Question 1

Which of the following best illustrates the concept of 'emergent properties' in biology?

Accepted Answer

A functioning heart can pump blood, but individual heart cells cannot.

Question 2

Which of the following statements about prokaryotic and eukaryotic cells is correct?

Accepted Answer

Prokaryotic cells lack membrane-bound organelles, while eukaryotic cells contain them.

Question 3

A scientist observes that plants grow faster when exposed to blue light. She hypothesizes that blue light increases the rate of photosynthesis. Which type of reasoning is she using to form her hypothesis?

Accepted Answer

Inductive reasoning

Question 4

Which of the following best describes the flow of genetic information in a cell?

Accepted Answer

$$DNA \rightarrow RNA \rightarrow Protein$$

Question 5

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

Accepted Answer

The bond between hydrogen and oxygen within a water molecule

Question 6

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

Accepted Answer

$$[H^+] = 1 	imes 10$$^{-4}$$ \ M$$

Question 7

Which property of water allows insects to walk on its surface?

Accepted Answer

Surface tension

Question 8

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

Accepted Answer

Ice is less dense than liquid water because its molecules are held further apart by hydrogen bonds.

Question 9

Which of the following is a correct pairing of a macromolecule and its monomer?

Accepted Answer

Nucleic acid – Nucleotide

Question 10

A patient is found to have a genetic disorder caused by a single base change in their DNA. Which level of protein structure is most directly affected by this mutation?

Accepted Answer

Primary structure

Question 11

Which of the following best describes the difference between saturated and unsaturated fats?

Accepted Answer

Saturated fats have no double bonds in their fatty acid chains; unsaturated fats have one or more double bonds.

Question 12

Which of the following is an example of an anabolic reaction?

Accepted Answer

Synthesis of proteins from amino acids

Question 13

Which of the following best explains why water is an excellent solvent for ionic compounds?

Accepted Answer

Water molecules form hydrogen bonds with ions, surrounding and separating them.

Question 14

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

Accepted Answer

Buffers prevent drastic changes in pH by accepting or donating $$H^+$$ ions.

Question 15

Which of the following is a correct statement about DNA and RNA?

Accepted Answer

DNA contains deoxyribose sugar, while RNA contains ribose sugar.

Question 16

A scientist is studying a protein that has lost its function due to high fever in a patient. What is the most likely explanation for this loss of function?

Accepted Answer

The protein has been denatured, losing its three-dimensional structure.

Question 17

Which of the following best describes the relationship between structure and function in biological molecules?

Accepted Answer

The function of a molecule is determined by its three-dimensional structure.

Question 18

Which of the following is an example of a dehydration synthesis reaction?

Accepted Answer

Joining two monosaccharides to form a disaccharide, releasing water

Question 19

Which of the following best describes the concept of evolution by natural selection?

Accepted Answer

Populations change over generations as individuals with advantageous traits survive and reproduce more successfully.

Question 20

A researcher is studying the effect of increased atmospheric $$CO_2 on $$plant growth. Which two major themes of biology does this research most directly relate to?

Accepted Answer

Energy & Matter and Interactions

General Biology: Core Themes, Chemistry of Life, and Macromolecules

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