Q: Which equation correctly represents the process of cellular respiration?

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

Question 1

Which of the following is NOT a characteristic that defines living cells?

Accepted Answer

Presence of a nucleus

Question 2

A scientist wants to test the effect of light intensity on the rate of photosynthesis in aquatic plants. Which step of the scientific method is represented by forming a hypothesis?

Accepted Answer

Making an educated guess about the outcome

Question 3

Which biomolecule is primarily responsible for catalyzing biochemical reactions in cells?

Accepted Answer

Proteins

Question 4

In a survey to determine the average height of students in a university, which of the following best represents the dependent variable?

Accepted Answer

The height measured in centimeters

Question 5

Which equation correctly represents the process of cellular respiration?

Accepted Answer

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

Question 6

Which of the following best explains why ecosystems are important for the evolution of species?

Accepted Answer

Ecosystems create selective pressures that drive natural selection.

Question 7

A student proposes an experiment to test the effect of temperature on enzyme activity. Which of the following is the best way to ensure the experiment follows the scientific method?

Accepted Answer

Keep all variables constant except temperature

Question 8

Which of the following statements about biomolecules is correct?

Accepted Answer

Proteins can act as enzymes to speed up chemical reactions.

Question 9

A population of beetles in a forest ecosystem shows variation in shell color. Over time, birds preferentially eat beetles with lighter shells. What evolutionary process is most directly illustrated by this scenario?

Accepted Answer

Natural selection

Question 10

Which of the following is a real-world example of a physiological mechanism involving biomolecules?

Accepted Answer

The breakdown of glucose by enzymes during cellular respiration

Question 11

Which of the following best describes the role of nucleic acids in cells?

Accepted Answer

They store and transmit genetic information.

Question 12

A researcher observes that plants in a polluted ecosystem have lower rates of photosynthesis. Which scientific method step should the researcher take next?

Accepted Answer

Formulate a hypothesis explaining the observation

Question 13

Which of the following is an example of a multi-step biochemical reaction involving biomolecules?

Accepted Answer

Glycolysis, where glucose is converted to pyruvate through a series of enzyme-catalyzed steps

Question 14

Which formula represents the general structure of an amino acid?

Accepted Answer

$$ NH_2$-CHR-COOH $$

Question 15

Why is metabolism considered a defining property of living cells?

Accepted Answer

It allows cells to maintain homeostasis by controlling energy and material flow.

Question 16

Which of the following best illustrates the importance of ecosystems in species evolution?

Accepted Answer

A species of fish develops resistance to pollutants in a river ecosystem.

Question 17

A student wants to test whether salt concentration affects the rate of osmosis in potato cells. Which of the following is the best experimental design?

Accepted Answer

Keep all variables constant except salt concentration

Question 18

Which of the following is a correct application of the scientific method in biology?

Accepted Answer

Making observations, forming a hypothesis, conducting experiments, analyzing data, and drawing conclusions

Question 19

Which of the following is a property shared by all living cells?

Accepted Answer

Ability to maintain homeostasis

Question 20

Which of the following best describes the relationship between biomolecules and physiological mechanisms?

Accepted Answer

Biomolecules such as enzymes regulate physiological mechanisms by catalyzing reactions.

General Biology: Course Outcomes and Key Concepts

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