Question 1

Which of the following best describes the visible region of the electromagnetic spectrum that humans can detect with their eyes?

Accepted Answer

Wavelengths between approximately 400 nm and 710 nm

Question 2

Light behaves as particles called photons. Which of the following statements about photons is correct?

Accepted Answer

Photons are discrete packets of energy that can be absorbed by molecules, causing conformational changes.

Question 3

Which of the following best explains why different pigments absorb different wavelengths of light?

Accepted Answer

Their molecular structure determines which wavelengths of light energy they can absorb.

Question 4

What is the primary function of cone cells in the retina?

Accepted Answer

To allow the brain to interpret different wavelengths of light as color.

Question 5

Which of the following statements about opsin proteins in cone cells is correct?

Accepted Answer

Trichromatic vision results from the presence of three different opsin proteins sensitive to short, medium, and long wavelengths.

Question 6

A person with only SWS (short wave sensitive) and LWS (long wave sensitive) opsins would most likely:

Accepted Answer

Have dichromatic vision and be unable to distinguish some colors.

Question 7

What is the significance of a conformational change in a photoreceptor protein after photon absorption?

Accepted Answer

It initiates a signal transduction pathway that ultimately leads to visual perception.

Question 8

Which of the following is a unifying concept of biology that explains both the unity and diversity of life?

Accepted Answer

The theory of evolution by natural selection

Question 9

According to the cell theory, which of the following statements is correct?

Accepted Answer

All cells come from pre-existing cells.

Question 10

Which of the following best describes a scientific theory?

Accepted Answer

A broad explanation based on many lines of evidence that generates new hypotheses and has withstood rigorous testing.

Question 11

A phylogenetic tree is used to:

Accepted Answer

Show evolutionary relationships and the unity and diversity of life.

Question 12

Which of the following is NOT a fundamental characteristic of life shared by all organisms?

Accepted Answer

Ability to photosynthesize

Question 13

If an individual lacks the M (medium wavelength) opsin, which color vision deficiency are they most likely to experience?

Accepted Answer

Difficulty distinguishing between red and green colors

Question 14

Which of the following best explains why all organisms alive today are related by descent from a common ancestor?

Accepted Answer

Because all species come from (descend from) other pre-existing species.

Question 15

Which of the following is a correct application of the theory of evolution by natural selection?

Accepted Answer

Individuals with certain heritable traits produce more offspring than those without those traits.

Question 16

Which of the following equations correctly represents the relationship between the energy $$E of a $$photon and its wavelength $$\lambda$$?

Accepted Answer

$$E = \dfrac{hc}{\lambda}$$

Question 17

A scientist discovers a new organism that is made up of cells, can replicate, and uses energy. According to the unifying concepts of biology, what can be inferred about this organism?

Accepted Answer

It shares fundamental characteristics with all known life forms.

Question 18

Which of the following scenarios best illustrates the mechanism of natural selection?

Accepted Answer

A population of bacteria exposed to antibiotics develops resistance over several generations due to survival of resistant individuals.

Question 19

Which of the following best describes the difference between a common ancestor and a unique ancestor in a phylogenetic tree?

Accepted Answer

A common ancestor is shared by multiple lineages, while a unique ancestor is specific to a single lineage.

Question 20

Which of the following is a real-world example of how the structure of the vertebrate eye supports its function?

Accepted Answer

The lens focuses light onto the retina, where photoreceptors convert light into neural signals.

Fundamentals of Light, Vision, and Unifying Concepts in Biology

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