Acetylcholine Binds to a GPCR on Heart Muscle, Making the Heart

question 20

Multiple Choice

Acetylcholine binds to a GPCR on heart muscle, making the heart beat more slowly.The activated receptor stimulates a G protein, which opens a K⁺ channel in the plasma membrane, as shown in Figure 16-13.Which of the following would enhance this effect of the acetylcholine? Figure 16-13

• A)addition of a high concentration of a nonhydrolyzable analog of GTP
• B)addition of a drug that prevents the α subunit from exchanging GDP for GTP
• C)mutations in the acetylcholine receptor that weaken the interaction between the receptor and acetylcholine
• D)mutations in the acetylcholine receptor that weaken the interaction between the receptor and the G protein

Identify the conditions under which the F-test is appropriate for comparing two variances.

Calculate the F-test statistic for comparing two sample variances.

Determine the critical value and rejection region from the F-table.

Understand the role of sample size in the significance of the F-test.

---

Definitions:

Palliative Effect

An approach to treatment aimed at relieving symptoms and improving the quality of life, without necessarily curing the disease.

Radiation

Energy that is emitted in the form of waves or particles, which can be natural or artificial and has applications in medicine, energy production, and various technologies.

Localized

Restricted to a specific area or region; not widespread or generalized.

Immunotherapy

A treatment that uses certain parts of a person’s immune system to fight diseases such as cancer.