大学MOOC 细胞生物学及实验（何九军）(陇南师范高等专科学校)1450844164 最新慕课完整章节测试答案

Biomembrane Structure-test

1、单选题：
All the following statements describe biomembranes except:​​​
选项：
A: Different biomembranes may contain different proportions of the same phospholipids.
B:  The two leaflets of a biomembrane may contain different phospholipids.
C:  Some biomembranes have free edges.
D: Some phospholipids and cholesterol may cluster to form lipid rafts.  
答案: 【  Some biomembranes have free edges.】

2、单选题：
‌ The major site of lipid synthesis in eukaryotic cells is the‏
选项：
A: Nucleus
B: Endoplasmic reticulum
C: Mitochondria
D: Cell membrane
答案: 【 Endoplasmic reticulum】

3、单选题：
Phospholipids with short or unsaturated fatty acyl chains‌‌
选项：
A: decrease membrane fluidity.
B: increase membrane fluidity.
C:  cause biomembranes to become thicker
D: allow hydrophilic molecules to diffuse across the lipid bilayer.
答案: 【 increase membrane fluidity.】

4、单选题：
 The _______ are transmembrane proteins.‍‍
选项：
A: lipid-anchored membrane proteins
B: integral membrane proteins
C: peripheral membrane proteins
D: extracellular matrix proteins
答案: 【 integral membrane proteins】

5、单选题：
Glycolipids and glycoproteins are especially abundant in the‌
选项：
A:  nucleus.
B: mitochondrial inner membrane
C: cytosol
D: plasma membrane