【单选题】
Reporters must be impartial and not show political ________.
A.
bias
B.
justice
C.
honesty
D.
equality

A.

B.

C.

D.

A.
$A$与$B$一定相似
B.
$A$和$B$有相同的初等因子
C.
$\lambda E-A$与$\lambda E-B$的秩相同
D.
$A=B$

A.

B.

A.

B.

C.

D.

Hershey and Chase use phage Viruses as working model. was used to label the DNA contained in the T2 phage, used to label the protein sections of the T2 phage.（）
A.
Phosphorus-32, sulfur-35
B.
Phosphorus-30, sulfur-35
C.
Phosphorus-32, sulfur-32
D.
Phosphorus-30, sulfur-32
The central dogma of molecular biology describes the two-step process, transcription and translation, by which the information in genes flows into proteins: DNA → RNA → protein.（）
A.

B.

A.
B.
C.
D.
Okazaki fragments are short sequences of DNA nucleotides which are synthesized discontinuously Okazaki fragments were later linked together by the enzyme DNA ligase to create the leading strand during...
A.

B.

A.

B.

C.

RNA polymerase is an enzyme that is responsible for copying a DNA sequence into an RNA sequence, during the process of transcription.（）
A.

B.

A.
B.

A.
B.
Each of the three RNA polymerases in eukaryotes is responsible for transcribing a unique type of RNA.（）
A.

B.

A.
B.

A.

B.

A.

B.

C.

D.

A.
B.

A.

B.

C.
3岁以下患者占85-90%
D.
80%以上有AFP升高

A.

B.

C.

D.

A.

B.

C.

D.

A.

B.

C.

A.

B.

C.

D.

A.
B.
C.

A.
A D
B.
A C
C.
B C
D.
B D

A.

B.

C.

D.

A.
C B
B.
C D
C.
B A
D.
B D

A.

B.

RNA polymerase II is a multiprotein complex. It is one of the three RNAP enzymes found in the nucleus of eukaryotic cells. It catalyzes the transcription of DNA to synthesize precursors of mRNA and mo...
A.
RNA polymerase І
B.
RNA polymerase II
C.
RNA polymerase III
D.
RNA polymerase IV

A.

B.

A.
$\frac{1}{3}(2\alpha_{1}+2\alpha_{2}-\alpha_{3}),\frac{1}{3}(2\alpha_{1}-\alpha_{2}+2\alpha_{3}),\frac{1}{3}(\alpha_{1}-2\alpha_{2}-2\alpha_{3})$
B.
$2\alpha_{1}+2\alpha_{2}-\alpha_{3}, 2\alpha_{1}-\alpha_{2}+2\alpha_{3}, \alpha_{1}-2\alpha_{2}-2\alpha_{3}$
C.
$\frac{1}{3}(2\alpha_{1}-2\alpha_{2}-\alpha_{3}),\frac{1}{3}(2\alpha_{1}+\alpha_{2}+2\alpha_{3}),\frac{1}{3}(\alpha_{1}-2\alpha_{2}-2\alpha_{3})$
D.
$2\alpha_{1}-2\alpha_{2}-\alpha_{3}, 2\alpha_{1}+\alpha_{2}+2\alpha_{3}, \alpha_{1}-2\alpha_{2}-2\alpha_{3}$

A.

B.

C.

A.

B.

C.

A.
CT提示附件区或子宫直肠陷窝处得均一水样密度肿块,呈圆形或椭圆形,边缘光滑,壁薄,无内隔,增强扫描无强化
B.

C.

D.
CT提示子宫腔内可见软组织密度肿物,密度低于正常强化的子宫肌,肿瘤呈菜花状或结节状,周围可为更低密度的子宫腔内积液所环绕,也可填充全部子宫腔
E.

A transfer RNA molecule is used in translation and consists of a single RNA strand that is only about 80 nucleotides long.（）
A.

B.

Ribosomes are minute particles consisting of RNA and associated proteins that function to synthesize proteins.（）
A.

B.

A.

B.

C.

D.

In eukaryotes and archaea, the amino acid encoded by the start codon is methionine.（）
A.

B.

A.

B.

C.

D.

E.

A.

B.

C.

D.

E.

3维欧氏空间R3 (取标准内积)中的向量(2, 3,－1), (1, 1, 0),(0, 1,－1)生成的子空间的正交补空间的维数是（ ）。
A.
$0$
B.
$1$
C.
$2$
D.
$3$

A.

B.

C.

D.

E.

A.

B.

A.

B.

C.

D.

E.

A.

B.

PCR primers for the qPCR step of RT-qPCR should ideally be designed to span an exon-exon junction, with one of the amplification primers potentially spanning the actual exon-intron boundary. （）
A.

B.

A.

B.

C.

D.

E.

A.

B.

C.

D.

In two-step RT-qPCR assays, the reverse transcription and PCR steps are performed in separate tubes, with different optimized buffers, reaction conditions, and priming strategies.（）
A.

B.

A basic PCR set-up requires several components and reagents, Which of the following are included?（）
A.
DNA template
B.
DNA polymerase
C.
Two DNA primers
D.
dNTPs

A.
$(1,-1,0)^{T},(1,0,-1)^{T}$
B.
$(-1,-1,2)^{T},(1,1,-1)^{T}$
C.
$(1,1,0)^{T},(1,0,-1)^{T}$
D.
$(1,-1,0)^{T},(2,1,-1)^{T}$
About step of gene clone, Which of the following are included?（）
A.
Preparation of RNA to be cloned
B.
Creation of recombinant DNA with DNA ligase
C.
Introduction of recombinant DNA into host organism
D.
Screening for clones with desired DNA inserts and biological properties

A.
B.
C.
D.

A.

B.

C.

D.

E.

Golden rice is a variety of rice produced through genetic engineering to biosynthesize beta-carotene, a precursor of vitamin A, in the edible parts of rice. It is intended to produce a food to be grow...
A.

B.

A.

B.

C.

D.

A.

B.

C.

D.

E.

Most current GM crops have been engineered for resistance to insects, tolerance to herbicides or both.（）
A.

B.

A.

B.

C.

D.

E.

A.

B.

C.

Mainly protein production includes three main steps, including（）.
A.
Gene cloning
B.
Gene expression
C.
Protein quantification
D.
Protein purification

A.

B.

C.

D.

A.

B.

C.

D.

E.

A.
A的属于不同特征值的特征向量是正交的
B.
A的不变子空间的正交补还是A的不变子空间
C.
A在任何一组基下的矩阵是对称矩阵
D.
A在标准正交基下的矩阵是对称矩阵
Coding sequence is the candidate genes you are interested in, including（）.
A.
Herbicide residence gene
B.
Pest resistance gene
C.
Salt tolerance or nutritional enhancement gene
D.
Virulence gene

A.
B.

A.

B.

C.

A.
B.
C.
D.

A.

B.

P型半导体参与导电的是()
A.

B.

C.

People find that nearly all known enzymes are proteins. There are only a few RNA among them.（）
A.

B.

The enzyme-catalyzed reaction is specific andan enzyme onlycatalyzes a single chemical reaction.（）
A.

B.

A.

B.

C.

Enzymes could accelerate the reaction rate and could alter the equilibrium of a chemical reaction.（）
A.

B.

A.

B.

C.

The most striking characteristics of enzymes are and .（）
A.
Diversity
B.
Catalytic power
C.
Specificity
D.
Tenderness

A.

B.

C.

D.

A.

B.

C.

A.
B.

A.

B.
IVP
C.
MRI+MRS
D.
CT平扫加增强扫描 E膀胱造影检查
The transition state is a transitory molecular structure that is no longer the substrate but is not yet the product.（）
A.

B.

A.
$36$
B.
$18$
C.
$12$
D.
$0$
Much of the catalytic power of enzymes comes from their binding to and then altering the structure of the substrate to promote the formation of the transition state.（）
A.

B.

A.

B.

C.

D.

A.

B.

C.

D.

In enzyme–substrate binding induced-fit model, the active site of the unbound enzyme is complementary in shape to the substrate.（）
A.

B.

A.

B.

C.

D.

A.
B0
B.
B
C.
M
D.
H

A.
B.
$P^{n\times n}$的对偶空间维数是（ ）。
A.
$n$
B.
$2n$
C.
$n^{2}$
D.
$n^{3}$

A.
B0 .
B.
B
C.
M
D.
H

A.
B.
Simple carbohydrates are called monosaccharides. These simple sugars serve not only as fuel molecules but also as fundamental constituents of living systems.（）
A.

B.

The essence of catalysis is （）.
A.
Speed up the rate of chemical reactions
B.
Alter the laws of thermodynamics
C.
Alter the equilibrium of a chemical reaction
D.
Facilitating the formation of the transition state

A.

B.

Glucose andfructosearean essential energy source for virtually all forms of life.（）
A.

B.

A.
B.

A.

B.

C.

D.

A.

B.

C.

D.

A.

B.

C.

D.

A.
105
B.
1~10-3
C.
1~103
D.
10-5