AP (Advanced Placement) Biology: Questions 294 - 296 of 1309
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Question 294
Question MCQ▾
What % of O2 is transported by RBCs in the blood?
Choices
Choice (5) | Response | |
---|---|---|
a. | 50% | |
b. | 25% | |
c. | 70% | |
d. | 97% | |
e. | 20% |
Question 295
Question MCQ▾
Osteoarthritis differs from rheumatoid arthritis in that
Choices
Choice (5) | Response | |
---|---|---|
a. | the former is caused by wear, whereas the latter is caused by infection | |
b. | the former involves adjacent ligaments, whereas the latter does not | |
c. | the former is initiated by mechanical mechanisms, whereas the latter is an autoimmune disorder | |
d. | the former affects primarily synovial joints, whereas the latter primarily affects fibrocartilage | |
e. | the former retains overall integrity of the joint, whereas the latter produces permanent deformation |
Question 296
Question MCQ▾
Cardiac muscle cells, when grown in the lab in petri dishes, begin to beat in a synchronized fashion when they make contact with each other. Why might this be so?
Choices
Choice (5) | Response | |
---|---|---|
a. | The cells connect to each other by gap junctions upon making contact. | |
b. | The cells release ATP into the surrounding medium in a synchronized fashion. | |
c. | The cells start to form nerve connections between themselves. | |
d. | The cells release into the surrounding medium calcium ions that synchronizes contraction. | |
e. | When 1 cell starts to contract, any cell in contact responds to the sudden motion as a physically gated stimulus. |