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【判断题】
B2 细胞的 BCR 与抗原结合的特异性低,具有多反应性。A.
正确
B.
错误
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举一反三
【单选题】以下关于塑料袋盛热食的危害说法错误的是：
A.
塑料袋添加的颜料遇到油时会被溶出，这些颜料主要是有一定致癌性的偶氮类化合物，对人体产生毒害作用
B.
塑料袋中含有塑化剂，它可以让塑料的柔韧性变得更好，但危害不容小觑
C.
塑化剂在油性环境或者加热情况下，迁移到食物中
D.
使用白色无味或专业、有安全生产标志的食品级塑料袋，遇到热油或高温，不会析出塑化剂
【简答题】( ) is the subcellular organelle to synthesize phospholipids.
【多选题】Membrane phospholipids move within the lipid bilayer in several different ways:
A.
lateral diffusion
B.
flexion
C.
rotation
D.
flip-flop (rare)
【简答题】Never try to move that delicate part; it is (move) ______.
【单选题】Phospholipids are NOT necessary for which of the following?
A.
(A) cell walls
B.
(B) Golgi apparatus
C.
(C) plasma membrane
D.
(D) mitochondria
E.
(E) endoplasmic reticulum
【多选题】How do r etrotransposons move?
A.
Retrotransposons are first transcribed into an RNA intermediate.
B.
Next, a double-stranded DNA copy of this RNA is synthesized by the enzyme reverse transcriptase. This DNA copy is then inserted into the target location, which can be on either the same or a different DNA molecule.
C.
The donor retrotransposon remains at its original location, so each time it transposes, it duplicates itself.
D.
These mobile genetic elements are called retrotransposons because at one stage in their transposition their genetic information flows backward, from RNA to DN
【单选题】The backbone of phospholipids is _________________________.
A.
L-glycerol 3-phosphate
B.
D-glycerol 3-phosphate
C.
glycerol
D.
sphingosine
【简答题】phospholipids (磷脂)
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