Q: Which of the following equations correctly represents the overall process of cellular respiration?

$$\mathrm{C_6H_{12}O_6$} + 6\mathrm{O_2$} \rightarrow 6\mathrm{CO_2$} + 6\mathrm{H_2O} + \text{energy}$$

Question 1

Which of the following best explains how enzymes lower the activation energy of a chemical reaction?

Accepted Answer

By stabilizing the transition state and decreasing the energy required for the reaction to proceed

Question 2

A scientist is studying the movement of electrons from NADH and FADH$$_2$$ through the electron transport chain in mitochondria. Which molecule is the final electron acceptor in this process?

Accepted Answer

Oxygen (O$$_2)$$

Question 3

Which of the following equations correctly represents the overall process of cellular respiration?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} + 6\mathrm{O_2$} ightarrow 6\mathrm{CO_2$} + 6\mathrm{H_2O} + 	ext{energy}$$

Question 4

During photosynthesis, which molecule acts as the primary electron donor in the light-dependent reactions?

Accepted Answer

Water ($$\mathrm{H_2O})$$

Question 5

Which phase of mitosis is characterized by the alignment of chromosomes along the center of the cell?

Accepted Answer

Metaphase

Question 6

A mutation causes a change in the DNA sequence from GAA to GAG. What type of mutation is this, and what is its likely effect?

Accepted Answer

Silent mutation; no change in the amino acid sequence

Question 7

Which enzyme is responsible for synthesizing new DNA strands during replication?

Accepted Answer

DNA polymerase

Question 8

In a population of moths, a genetic mutation increases the frequency of dark-colored individuals after industrial pollution darkens tree bark. This is an example of:

Accepted Answer

Natural selection

Question 9

Which of the following best describes the difference between leading and lagging strand synthesis during DNA replication?

Accepted Answer

The leading strand is synthesized continuously, while the lagging strand is synthesized in short fragments called Okazaki fragments

Question 10

Which process is responsible for the movement of protons across the thylakoid membrane to generate ATP during photosynthesis?

Accepted Answer

Chemiosmosis

Question 11

A cell with a diploid number of 8 ($$2n = 8) $$undergoes meiosis. How many chromosomes will each gamete contain after meiosis is complete?

Accepted Answer

$$4$$

Question 12

Which of the following is NOT a function of ATP in cellular metabolism?

Accepted Answer

Serving as a building block for DNA synthesis

Question 13

Which of the following statements about genetic recombination during meiosis is correct?

Accepted Answer

Independent assortment of chromosomes increases genetic diversity

Question 14

Which of the following best describes the role of RNA polymerase in transcription?

Accepted Answer

It synthesizes a complementary RNA strand from a DNA template

Question 15

A population of finches on an island evolves larger beaks over several generations due to a change in available food sources. This is an example of:

Accepted Answer

Directional selection

Question 16

Which of the following is a post-transcriptional modification in eukaryotic cells?

Accepted Answer

Addition of a 5' cap to mRNA

Question 17

Which of the following best describes the difference between silent, missense, and nonsense mutations?

Accepted Answer

Silent mutations do not change the amino acid sequence, missense mutations change one amino acid, and nonsense mutations introduce a stop codon

Question 18

Which of the following evolutionary mechanisms is most likely to increase genetic variation in a population?

Accepted Answer

Mutation

Question 19

Which of the following statements about the central dogma of molecular biology is correct?

Accepted Answer

Information flows from DNA to RNA to protein

Question 20

A researcher observes that two unrelated species living in similar environments have developed similar adaptations, such as streamlined bodies and fins. This is an example of:

Accepted Answer

Convergent evolution

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