Q: Which equation best represents the process of photosynthesis?

$$6\ \mathrm{CO}_2 + 6\ \mathrm{H}_2\mathrm{O} + \text{light energy} \rightarrow \mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6\ \mathrm{O}_2$$

Question 1

Which of the following best describes the main difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells have their genetic material enclosed within a nucleus, whereas prokaryotic cells do not.

Question 2

A scientist is testing the effect of a new fertilizer on plant growth. She sets up two groups: one receives the fertilizer, and the other does not. Which aspect of the scientific method is best represented by the group that does not receive the fertilizer?

Accepted Answer

Control group

Question 3

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 4

Which of the following best explains why carbon is able to form such a wide variety of biological molecules?

Accepted Answer

Carbon can form up to four covalent bonds with other atoms.

Question 5

A patient is diagnosed with a mitochondrial disorder that impairs ATP production. Which cellular process would be most directly affected?

Accepted Answer

Oxidative phosphorylation during cellular respiration

Question 6

Which equation correctly represents the process of cellular respiration?

Accepted Answer

$$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6\ \mathrm{O}_2 ightarrow 6\ \mathrm{CO}_2 + 6\ \mathrm{H}_2\mathrm{O} + 	ext{energy}$$

Question 7

During which stage of cellular respiration is the majority of ATP produced?

Accepted Answer

Oxidative phosphorylation

Question 8

Which of the following statements about the Calvin cycle is correct?

Accepted Answer

It uses ATP and NADPH to convert $$\mathrm{CO}_2$$ into glucose.

Question 9

A mutation causes DNA polymerase to lose its proofreading ability during DNA replication. What is the most likely consequence?

Accepted Answer

The rate of mutations in the newly synthesized DNA will increase.

Question 10

Which of the following best describes the outcome of meiosis in animals?

Accepted Answer

Four haploid cells genetically different from each other and the parent cell

Question 11

Which process is responsible for the synthesis of RNA from a DNA template?

Accepted Answer

Transcription

Question 12

A plant bends toward a light source. Which hormone and process are primarily responsible for this response?

Accepted Answer

Auxin and phototropism

Question 13

Which of the following is a correct sequence of events during double fertilization in angiosperms?

Accepted Answer

One sperm fertilizes the egg, and another sperm fertilizes the central cell to form endosperm.

Question 14

Which of the following best describes the role of the kidney in osmoregulation?

Accepted Answer

The kidney selectively reabsorbs water and solutes to maintain homeostasis.

Question 15

Which equation best represents the process of photosynthesis?

Accepted Answer

$$6\ \mathrm{CO}_2 + 6\ \mathrm{H}_2\mathrm{O} + 	ext{light energy} ightarrow \mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6\ \mathrm{O}_2$$

Question 16

A patient is unable to absorb vitamin B12 due to a digestive disorder. Which organ system is most directly affected, and what is a likely consequence?

Accepted Answer

Circulatory system; decreased oxygen transport due to anemia

Question 17

Which of the following best explains why energy transfer between trophic levels in an ecosystem is inefficient?

Accepted Answer

Most energy is lost as heat due to metabolic processes, as described by the second law of thermodynamics.

Question 18

Which of the following scenarios best illustrates the concept of evolution by natural selection?

Accepted Answer

A population of bacteria exposed to antibiotics develops resistance over several generations.

Question 19

A student observes that a solution containing a biological molecule turns blue-black when iodine is added. Which macromolecule is most likely present?

Accepted Answer

Starch (a polysaccharide)

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