Q: Which of the following chemical reactions is an example of a catabolic pathway?

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

Question 1

Which of the following is NOT one of the four major biological themes commonly explored in introductory biology courses?

Accepted Answer

Gravity and planetary motion

Question 2

Which structure is present in all cells, both prokaryotic and eukaryotic?

Accepted Answer

Plasma membrane

Question 3

A scientist is comparing a bacterial cell and a human skin cell. Which of the following statements is correct regarding their genetic material?

Accepted Answer

The bacterial cell has a single circular chromosome, while the human cell has multiple linear chromosomes.

Question 4

Which of the following best describes the flow of energy in an ecosystem?

Accepted Answer

Energy enters as sunlight and leaves as heat.

Question 5

Which of the following chemical reactions is an example of a catabolic pathway?

Accepted Answer

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

Question 6

Which of the following statements about DNA and RNA is correct?

Accepted Answer

DNA stores genetic information, while RNA is involved in protein synthesis.

Question 7

Which process best explains how traits are passed from parents to offspring?

Accepted Answer

Inheritance of DNA

Question 8

Which of the following best explains why the genetic code is considered universal?

Accepted Answer

The same codons specify the same amino acids in nearly all organisms.

Question 9

Which of the following best describes the relationship between genes and proteins?

Accepted Answer

Genes encode the information to build proteins.

Question 10

A mutation occurs in a gene that codes for an enzyme. Which of the following is a possible consequence?

Accepted Answer

Any of the above, depending on the nature of the mutation.

Question 11

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

Accepted Answer

The process by which information from a gene is used to synthesize a functional product.

Question 12

Which of the following is the best example of evolution in a population?

Accepted Answer

A population of bacteria becomes more resistant to antibiotics over several generations.

Question 13

Which of the following statements about the universal tree of life is correct?

Accepted Answer

It shows that all living organisms share a common ancestor.

Question 14

Which of the following best describes an anabolic reaction?

Accepted Answer

$$ \mathrm{Amino\ acids} \rightarrow \mathrm{Protein} $$

Question 15

Which of the following is a transformation of energy that occurs in cells?

Accepted Answer

Conversion of light energy to chemical energy during photosynthesis.

Question 16

A patient is diagnosed with a mitochondrial disorder. Which cellular process is most likely to be directly affected?

Accepted Answer

ATP production through cellular respiration

Question 17

Which of the following best explains why prokaryotic cells can divide more rapidly than eukaryotic cells?

Accepted Answer

Prokaryotic cells lack a nucleus, allowing faster DNA replication.

Question 18

Which of the following is a real-world example of the importance of gene expression regulation?

Accepted Answer

Lactose intolerance in adults due to reduced expression of the lactase gene.

Question 19

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

Accepted Answer

Enzymes speed up chemical reactions by lowering the activation energy.

Question 20

Which of the following scenarios best illustrates the concept of energy flow and chemical cycling in an ecosystem?

Accepted Answer

A plant absorbs sunlight, produces glucose, and is eaten by a rabbit, which then excretes waste that decomposers break down into nutrients for the soil.

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