پاسخ : آزمایشات ibo
A1
نسخه ای کوچک از سوالات 2010 ibo
[FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]. Select the chemical property that is shared by all types of lipids forming the plasma membrane. [/FONT][/FONT]
[FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]A. Polar head
B. Sugar component
C. Glycerol backbone
D. Phosphate group
E. Hydrophobic region
[/FONT][/FONT][FONT=Arial,Arial][FONT=Arial,Arial]-
[/FONT][/FONT][FONT=Arial,Helvetica][FONT=Arial,Helvetica]IBO2010 KOREA THEORETICAL TEST Part A [/FONT][/FONT]
[FONT=Arial,Helvetica][FONT=Arial,Helvetica][/FONT][/FONT]4
A2
[FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]. The following photograph shows filamentous growth of a kind of cyanobacteria, [/FONT][/FONT][FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]Nostoc [/FONT][/FONT][FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman][/FONT][/FONT][FONT=Times New Roman,Times New Roman][FONT=Times New Roman,Times New Roman]sp. The bacteria form heterocysts (thick-walled cells), when nitrogen sources such as ammonia or nitrates are deficient in the environment. [/FONT][/FONT]
Which of the following statements describing these heterocysts is/are true?
I. Nitrogen is fixed in the heterocyst.
II. Photosystem I does not function in the heterocyst.
III. Photosystem II does not function in the heterocyst.
A. Only I
B. Only II
C. Only I and II
D. Only I and III
E. Only II and III
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