Q: Which equation correctly represents the overall 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 explains why ATP is often referred to as the 'energy currency' of the cell?

Accepted Answer

ATP directly transfers its phosphate group to other molecules, releasing energy that can be used for cellular work.

Question 2

During glycolysis, glucose is broken down into two molecules of pyruvate. What is the net gain of ATP molecules per glucose molecule during glycolysis?

Accepted Answer

$$2$$

Question 3

Which of the following statements about the citric acid cycle (Krebs cycle) is correct?

Accepted Answer

It produces NADH and FADH$$_2$$ that feed electrons into the electron transport chain.

Question 4

A patient with diabetes has difficulty regulating blood glucose levels. Which process is most directly affected in their cells?

Accepted Answer

The uptake and metabolism of glucose for ATP production.

Question 5

Which equation correctly represents the overall 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 6

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

Accepted Answer

Enzymes act as catalysts, lowering the activation energy and increasing the rate of reactions.

Question 7

A mutation in the gene encoding a membrane transport protein results in the inability of a cell to import glucose. Which cellular process would be most directly impaired?

Accepted Answer

ATP production via glycolysis.

Question 8

Which of the following scenarios best illustrates the concept of gene-environment interaction?

Accepted Answer

A person with a genetic predisposition to skin cancer develops the disease after years of sun exposure.

Question 9

Which of the following is a real-world application of DNA technology discussed in BIOSCI 101?

Accepted Answer

Using restriction enzymes to edit genes in crops for improved yield.

Question 10

Which of the following best describes the lac operon in bacteria?

Accepted Answer

A set of genes regulated together, allowing bacteria to metabolize lactose only when it is present.

Question 11

A scientist is studying a population of birds and observes a change in allele frequency over several generations. Which concept does this observation best illustrate?

Accepted Answer

Genetic drift

Question 12

Which of the following laboratory practices is essential for working safely with biological samples?

Accepted Answer

Wearing a lab coat and safety glasses at all times.

Question 13

Which of the following best explains why mutations can be both catastrophic and transformational for organisms?

Accepted Answer

Mutations can disrupt essential genes or create new beneficial traits.

Question 14

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

Accepted Answer

Transcription

Question 15

A student is asked to interpret a graph showing the rate of enzyme activity versus temperature. Which trend would they most likely observe?

Accepted Answer

Enzyme activity increases with temperature up to an optimum, then decreases sharply.

Question 16

Which of the following best describes the role of the electron transport chain in cellular respiration?

Accepted Answer

It transfers electrons from NADH and FADH$$_2 to $$oxygen, generating a proton gradient for ATP synthesis.

Question 17

Which of the following is a key ethical consideration in the use of gene editing technologies?

Accepted Answer

Balancing potential health benefits with risks of unintended genetic changes.

Question 18

Which formula correctly represents the calculation of allele frequency in a population?

Accepted Answer

$$	ext{Allele frequency} = \frac{	ext{Number of copies of the allele}}{	ext{Total number of all alleles for that gene in the population}}$$

Question 19

A researcher uses CRISPR-Cas9 to knock out a gene in a model organism. What is the most likely immediate result?

Accepted Answer

The targeted gene is permanently inactivated, potentially altering the organism's phenotype.

Question 20

Which of the following best describes the relationship between genotype and phenotype?

Accepted Answer

Genotype is the genetic makeup, which interacts with the environment to produce the phenotype.

BIOSCI 101: Life! Origins and Mechanisms – Course Overview and Key Topics

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