【判断题】Proteins can only bind to other proteins.
【多选题】A cell can control the proteins it contains by:
A.
(1) controlling when and how often a given gene is transcribed, (2) controlling how an RNA transcript is spliced or otherwise processed
B.
(3) selecting which mRNAs are exported from the nucleus to the cytosol
C.
(4) regulating how quickly certain mRNA molecules are degraded, (5) selecting which mRNAs are translated into protein by ribosomes
D.
(6) regulating how rapidly specific proteins are destroyed after they have been made; in addition, the activity of individual proteins, once they have been synthesized, can be further regulated in a variety of ways
【多选题】The lateral mobility of plasma membrane proteins can be restricted in several ways. Proteins can be tethered:
A.
to the cell cortex inside the cell
B.
to extracellular matrix molecules outside the cell
C.
to proteins on the surface of another cell
【简答题】现代操作系统都具有并发性、 、 和 ,其中并发性是操作系统最重要的特征,其它三个特性均基于并发性而存在。
【多选题】The membrane proteins can be classified into three categories: ( )
B.
lipid-anchored membrane proteins
C.
peripheral membrane proteins
【多选题】Membrane proteins can associate with the lipid bilayer in different ways:
A.
Transmembrane proteins can extend across the bilayer as a single α helix, as multiple α helices, or as a rolled-up β sheet (called a β barrel). These transmembrane proteins are amphipathic, having both hydrophobic and hydrophilic regions. Their hydrophobic regions lie in the interior of the bilayer, nestled against the hydrophobic tails of the lipid molecules. Their hydrophilic regions are exposed to the aqueous environment on either side of the membrane.
B.
Some membrane proteins are anchored to the cytosolic half of the lipid bilayer by an amphipathic α helix.
C.
Some proteins lie entirely outside the bilayer, on one side or the other, attached to the membrane by one or more covalently attached lipid groups.
D.
Many proteins are attached to the membrane only by relatively weak, noncovalent interactions with other membrane proteins.
【单选题】三山实验,是心理学家皮亚杰做过的一个著名的实验皮亚杰以此来证明儿童的“( )”的特点。
【简答题】现代操作系统都具有并发性、 、 和 ,其中并发性是操作系统最重要的特征,其他三个特征均基于并发性而存在。
【判断题】Only carrier proteins can carry out active transport, but both carrier proteins and channel proteins can carry out passive transport.