Question 1

Which of the following best describes the mechanism of endocrine signaling as shown in the first image?

Accepted Answer

Hormones are released into the bloodstream and can affect distant target cells throughout the body.

Question 2

In the endocrine pathway shown in the second image, what is the role of feedback inhibition?

Accepted Answer

It inhibits hormone production by the endocrine cell once the response is achieved.

Question 3

Which pathway involves a neurohormone released from a neuron, as depicted in the third image?

Accepted Answer

Neuroendocrine pathway

Question 4

In the neuroendocrine-to-endocrine pathway (fourth image), which of the following is TRUE?

Accepted Answer

A neurohormone stimulates an endocrine cell to release a hormone, which then acts on effector cells.

Question 5

Based on the fifth image, which hormone class is most likely to bind to intracellular receptors?

Accepted Answer

Steroids

Question 6

Which scenario best illustrates 'cross-talk' between signaling pathways as shown in the sixth image?

Accepted Answer

A signaling molecule activates multiple pathways, and the products of one pathway can inhibit or stimulate another pathway.

Question 7

Which checkpoint in the cell cycle ensures that DNA is undamaged and the cell is ready for division, as shown in the seventh image?

Accepted Answer

G1 checkpoint

Question 8

What is the immediate cellular response when a growth factor binds to its receptor, as shown in the eighth image?

Accepted Answer

A signal transduction cascade is triggered.

Question 9

Which of the following is NOT a requirement for passing the G1 checkpoint, as shown in the ninth image?

Accepted Answer

Chromosomes have properly segregated

Question 10

According to the tenth image, which condition must be met to pass the G2 checkpoint?

Accepted Answer

Chromosomes have replicated successfully

Question 11

Which checkpoint ensures that chromosomes are properly segregated and MPF is absent, as shown in the eleventh image?

Accepted Answer

M-phase checkpoint

Question 12

What distinguishes a benign tumor from a malignant tumor, as shown in the twelfth image?

Accepted Answer

Malignant tumors can spread to distant tissues via blood or lymph, while benign tumors do not.

Question 13

Which statement about cell cycle regulation is supported by the thirteenth image?

Accepted Answer

Checkpoint proteins inhibit cyclins and CDKs to block cell division and may activate programmed cell death.

Question 14

What is the consequence of a loss-of-function mutation in the p53 gene, as shown in the fourteenth image?

Accepted Answer

Cells with damaged DNA continue to divide, leading to mutations and potential cancer.

Question 15

Which germ layer gives rise to the digestive tract, as shown in the fifteenth image?

Accepted Answer

Endoderm

Question 16

Which stem cell type has the potential to give rise to all cell types in the embryo and postembryonic tissues, as defined in the sixteenth image?

Accepted Answer

Totipotent

Question 17

According to the seventeenth image, which statement is TRUE about somatic stem cells?

Accepted Answer

They are generally considered multipotent and can renew themselves and differentiate.

Question 18

What is the source of embryonic stem cells as shown in the eighteenth image?

Accepted Answer

Inner cell mass of a blastocyst

Question 19

Based on the nineteenth image, what is the approximate diameter of a blastocyst after 5 days of development?

Accepted Answer

0.1 to 0.2 millimeters

Question 20

In the twentieth image, how are pluripotent stem cells used to treat disease?

Accepted Answer

They are transplanted into patients to replace damaged or diseased tissues.

Cell Signaling, Cell Cycle Regulation, Development, and Stem Cells

Study Guide - Practice Questions