Question 1

Which of the following best describes the difference between a theory and a hypothesis in scientific research?

Accepted Answer

A hypothesis is a testable prediction, while a theory is a well-substantiated explanation supported by evidence.

Question 2

An atom of carbon has 6 protons, 6 neutrons, and 6 electrons. If you encounter a carbon isotope with 8 neutrons, what is its atomic mass?

Accepted Answer

14

Question 3

Which of the following best explains why valence electrons are important in forming compounds?

Accepted Answer

Valence electrons are responsible for the chemical reactivity and bonding between atoms.

Question 4

A solution has a pH of 3. Which statement is correct regarding its properties?

Accepted Answer

It is acidic and has a high concentration of H$$^{+}$$ ions.

Question 5

Which functional group is characterized by the formula $$-COOH$$ and is commonly found in amino acids?

Accepted Answer

Carboxyl group

Question 6

During dehydration synthesis, which of the following occurs?

Accepted Answer

A water molecule is removed to join two monomers into a polymer.

Question 7

Which of the following best describes the structure and function of phospholipids in the plasma membrane?

Accepted Answer

Phospholipids have a hydrophilic head and hydrophobic tails, forming a flexible bilayer.

Question 8

A cell is placed in a hypertonic solution. What will most likely happen to the cell?

Accepted Answer

The cell will lose water and shrink.

Question 9

Which organelle is responsible for producing ATP through cellular respiration?

Accepted Answer

Mitochondria

Question 10

Which of the following best describes the role of NAD$$^{+} in $$cellular respiration?

Accepted Answer

NAD$$^{+}$$ acts as an electron carrier, accepting electrons during redox reactions.

Question 11

Which process occurs in the cytoplasm and results in the breakdown of glucose into pyruvate?

Accepted Answer

Glycolysis

Question 12

Which of the following statements correctly distinguishes between mitosis and meiosis?

Accepted Answer

Mitosis produces diploid cells, while meiosis produces haploid cells.

Question 13

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

Accepted Answer

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

Question 14

During DNA replication, which enzyme is responsible for joining Okazaki fragments on the lagging strand?

Accepted Answer

DNA ligase

Question 15

Which of the following best describes the relationship between DNA, mRNA, and protein synthesis?

Accepted Answer

DNA is transcribed into mRNA, which is then translated into protein.

Question 16

Which of the following is NOT a function of the plasma membrane?

Accepted Answer

Synthesizing proteins for the cell

Question 17

Which of the following best describes facilitated diffusion?

Accepted Answer

Movement of molecules down their concentration gradient through a protein channel without energy

Question 18

Which of the following is a correct example of complementary base pairing in DNA?

Accepted Answer

A pairs with T, C pairs with G

Question 19

Which of the following best describes the function of tRNA during translation?

Accepted Answer

tRNA carries amino acids to the ribosome and matches its anticodon to the mRNA codon.

Question 20

A patient is diagnosed with a genetic disorder caused by a mutation in the promoter region of a gene. Which step of transcription is most likely affected?

Accepted Answer

Initiation, because the RNA polymerase cannot bind to the promoter.

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