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

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

Question 1

Which property of water allows it to moderate Earth's climate by absorbing and releasing large amounts of heat with only slight changes in its own temperature?

Accepted Answer

High specific heat capacity

Question 2

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

Accepted Answer

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

Question 3

Which of the following best describes a hydrolysis reaction?

Accepted Answer

A reaction that breaks a polymer into monomers by adding a water molecule

Question 4

Which type of bond is primarily responsible for the secondary structure of proteins?

Accepted Answer

Hydrogen bonds

Question 5

Which of the following is a key difference between prokaryotic and eukaryotic cells?

Accepted Answer

Prokaryotic cells lack a nucleus

Question 6

Which structure is present in plant cells but not in animal cells?

Accepted Answer

Chloroplast

Question 7

Which organelle is primarily responsible for the production of ATP in eukaryotic cells?

Accepted Answer

Mitochondrion

Question 8

According to the endosymbiotic theory, which organelle is believed to have originated from a free-living prokaryote engulfed by an ancestral eukaryotic cell?

Accepted Answer

Mitochondrion

Question 9

During aerobic cellular respiration, what is the net gain of ATP molecules produced from one molecule of glucose?

Accepted Answer

36-38 ATP

Question 10

Which of the following best explains why enzymes are essential for life?

Accepted Answer

They lower the activation energy required for reactions

Question 11

If a cell is placed in a hypertonic solution, what will most likely happen to the cell?

Accepted Answer

It will lose water and shrink

Question 12

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

Accepted Answer

Carbohydrate – Monosaccharide

Question 13

Which process in cellular respiration produces the most ATP?

Accepted Answer

Electron transport chain and oxidative phosphorylation

Question 14

Which of the following statements about condensation (dehydration synthesis) reactions is correct?

Accepted Answer

They join monomers by removing a water molecule

Question 15

A patient is unable to digest lactose due to a deficiency in the enzyme lactase. Which type of macromolecule is directly affected?

Accepted Answer

Carbohydrate

Question 16

Which of the following best describes the function of ribosomes in a cell?

Accepted Answer

Synthesize proteins

Question 17

Which of the following is a difference between DNA and RNA?

Accepted Answer

DNA is usually double-stranded, RNA is usually single-stranded

Question 18

Which of the following best explains why plant cells can perform photosynthesis but animal cells cannot?

Accepted Answer

Plant cells have chloroplasts

Question 19

Which of the following is a function of the Golgi apparatus?

Accepted Answer

Modification and packaging of proteins

Question 20

A scientist is studying a cell that contains both DNA and ribosomes but lacks a nucleus. Which type of cell is she most likely observing?

Accepted Answer

Prokaryotic cell

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