Question 1

What can you infer from studies that show that when subjects are surgically treated for epilepsy, and are shown visual images, cells in the medial temporal lobe and hippocampus fire?

Accepted Answer

The firing of cells in the medial temporal lobe and hippocampus in response to visual images suggests that the visual cortex, which processes visual information, sends impulses to these areas for further processing and memory formation.

Question 2

When the patient was shown a picture of someone they recognized, a single hippocampal neuron fired

Accepted Answer

B

Question 3

Concept cells are a specialized type of neuron in the

Accepted Answer

Concept cells, also known as "Jennifer Aniston neurons," are specialized neurons found in the human hippocampus. They are known for their ability to respond to specific concepts, ideas, or individuals, rather than to general categories of objects or scenes.

Question 4

If you are recording from a single concept cell to which you show eight images of the actor, Sean Connery (SC) mixed in with other images of relatively neutral stimuli (NS). Among such stimuli, are also four images of another famous actor, Patrick Stewart (PS). Total number of images shown is 100. In terms of the number of action potential spikes fired, how would the concept cell respond?

Accepted Answer

The concept cell is likely tuned to respond specifically to Sean Connery, so it would fire more action potentials for SC images compared to PS or NS images.

Question 5

Suppose you record from a single concept cell to which you show images of a famous person (or maybe a not-so-famous person, such as your sibling). And then, suppose you display a series of images of the same person, but with each successive image, the face has been increasingly altered to the point that the face on the final image no longer bears any resemblance to the original face. In terms of action potential spike firing, how would the concept cell respond?

Accepted Answer

The answer of Suppose you record from a single concept...

Question 6

When a neuron is said to "respond vigorously with a burst of action potentials," this means that the action potentials

Accepted Answer

When a neuron responds with a burst of action potentials, it means that the action potentials fire at a high frequency. This rapid firing is a common way for neurons to signal intense activity or a strong response to a stimulus.

Question 7

When a hippocampal neuron responds not only to one famous face from, say, a movie, but to all other famous faces from that same movie, this provides a common _______ for recognition.

Accepted Answer

This phenomenon illustrates the concept of context-dependent recognition, where the neuron's response is tied to the specific context (in this case, the particular movie) in which the faces are recognized, rather than to a broader category or concept.

Question 8

What group of cells are responsible for remembering and recognizing faces?

Accepted Answer

The fusiform face area (FFA) is a part of the human visual system that is specialized for facial recognition.

Question 9

To study the cellular basis of consciousness, what kind of technologies would most likely enable evaluation of the activities of several cells simultaneously?

Accepted Answer

Laser-scanning microscopy using fluorescent staining allows for the visualization and evaluation of the activities of multiple cells simultaneously by using fluorescent markers to highlight cellular structures and activities.

Question 10

Ultimately, the most thorough understanding of how tangible neural firing patterns are translated into intangible, abstract thought or consciousness is to understand the brain at the

Accepted Answer

The answer of Ultimately, the most thorough understanding of how...

Question 11

What is one of the principle ways in which astrocytes hinder the regeneration of injured axons?

Accepted Answer

Astrocytes contribute to the formation of glial scar tissue following nervous system injury, which acts as a physical and chemical barrier to axon regeneration.

Question 12

What is one advantage of using neural stem cells for repairing injured neuronal axons?

Accepted Answer

Neural stem cells have the potential to differentiate into any type of neural cell, which is advantageous for repairing injured neuronal axons because they can adapt and replace the specific types of cells needed in the damaged area.

Question 13

Which class of molecules would be a good candidate to aid in the regeneration of injured axons?

Accepted Answer

Growth factors, such as nerve growth factor, play a crucial role in the regeneration and repair of injured axons by promoting cell growth, survival, and differentiation.

Question 14

The proteome is much more complicated than the genome, not only because of RNA splicing, proteolytic processing, post-translational modifications, conformational variants, and other protein variants that the authors mention, but also because of

Accepted Answer

The complexity of the proteome is also influenced by the timing and regulation of protein expression, which can be constitutive or in response to specific signals, adding another layer of complexity beyond the genome.

Question 15

In biology, one of the most common ways to determine the function of something is to

Accepted Answer

Removing or preventing something from working (often called a "knockout" experiment) allows researchers to observe what changes occur, thereby inferring the function of the component.

Question 16

If an ion channel is composed of five different sub-units, and no RNA splicing or any other kind of processing occurs, how many different genes are required to express this channel?

Accepted Answer

Since the ion channel is composed of five different sub-units and there's no mention of any sub-unit being encoded by more than one gene or any gene encoding for more than one sub-unit, it implies that each sub-unit is encoded by a distinct gene. Therefore, five different genes are required to express this channel.

Question 17

If an ion channel is composed of five different sub-units, and assume no RNA splicing or any other kind of processing occurs, how many different genes are required to express and target this channel to its proper location within the cell?

Accepted Answer

The answer of If an ion channel is composed of...

Question 18

One of the main obstacles in treating monogenic diseases using gene therapy is that a single gene

Accepted Answer

The answer of One of the main obstacles in treating...

Question 19

Because baby-boomers are currently approaching retirement age, making the elderly population nearly double every 10 years, what is one disease whose cure, management, or slowing of its progress is particularly urgent?

Accepted Answer

Alzheimer's disease is particularly urgent to address due to the aging population. It is a common form of dementia that affects memory, thinking, and behavior, and its prevalence increases significantly with age.

Question 20

None of the cells in the retina proper are myelinated. One type of these cells, however, does transition from a nonmyelinated state to a myelinated one. Which cells are these?

Accepted Answer

Ganglion cells in the retina transition from a nonmyelinated state within the retina to a myelinated state after their axons exit the retina to form the optic nerve, facilitating faster signal transmission to the brain.

Quiz 30: Appendix