题目内容（请给出正确答案）

[单选题]

Proteins are large biological molecules consist of which of the following amino acids？

A.L-α-amino acids

B.D-α-amino acids

C.L-β-amino acids

D.D-β-amino acids

E.L- and D-β-amino acids

提问人：网友haikuangfei 发布时间：2022-01-07

参考答案

查看官方参考答案

如搜索结果不匹配，请联系老师获取答案

网友答案

查看全部（）

· 有3位网友选择 D，占比33.33%
· 有2位网友选择 BCE，占比22.22%
· 有1位网友选择 CE，占比11.11%
· 有1位网友选择 ACD，占比11.11%
· 有1位网友选择 BD，占比11.11%
· 有1位网友选择 B，占比11.11%

您可能会需要：

重置密码查看订单联系客服

安装简答题APP，拍照搜题省时又省心！

更多“Proteins are large biological …”相关的问题

第1题

Which of the following statements is TRUE, according to this passage?

A、The Bush government planned to launch a trade war.

B、The additional 30 percent of steel tariffs was imposed by the US government to protect the interests of the overseas companies.

C、Many countries in the world are following the US to seek relief under "anti-dumping" pricing rules and "safeguard" provisions.

D、Global competition is welcomed by all the industries in many countries.

点击查看答案

第2题

Read the passage and decide whether the following statement is true or false. Monster.com, the pioneer of online recruitment, shows how electronic marketplaces reach more people and can offer more efficiency than physical markets. It also shows that money can be made in such markets: Monster has a long record of profitability. Jeff Taylor, who launched the site in 1994, says that the Monster.com name is the firm’s “single most important success factor”. it introduces an image of youthful fun in what is basically a boring business. Supporting the brand is a big advertising budget which accounts for a quarter of the firm’s costs. He runs expensive ads during key sporting events such as the Super Bowl. Job-seekers supply resumes and employers pay to scan them or to post job ads. Most of the services that job-seekers get are free, but they have to pay for a service that allows them to contact each other for advice and career management. They can use this service to ask each other questions about, say, what it is like to work for a firm that they are thinking of joining. The main contribution of Monster has been to speed up hiring and vastly increase the accuracy of the job-searching process. “you can post a job at 2 pm and get your first response at 2.01,” Mr Taylor says proudly. And an employer who knows exactly what he wants can use Monster’s filter to search vast number of resumes with precise accuracy. Monster is a serious threat to newspapers,which historically made 40% of the revenues from carrying ads, up to half of which were for staff. Headhunting firms have also lost business, because demand for their help in filling lower-level jobs has fallen. The online job market works well for workers and employers who know what they want. It works badly for people who are unsure. Check that your resume says clearly what kind of job you want. The filters will then make sure that it reaches the right human resources department. Decide whether the following statement is true or false: To fund key sporting events is an important way to promote the brand for Monster.com.

点击查看答案

第3题

If you describe a person’s size or shape, you can use（）.

A、fat, tubby, overweight

B、plump, stocky, or bonny

点击查看答案

第4题

要求：Ecoutez et choisissez la réponse qui indique l’ordre correct des phrases. (听录音按句子的正确顺序选择答案。获取音频请扫描下方二维码。)

① Est-ce que ce sont tes photos ? ② Non, ce n’est pas ma moto, c’est sa moto. ③ Non, ce ne sont pas mes photos, ce sont ses photos. ④ Est-ce que c’est ta moto ?

A、③①②④

B、③④②①

C、④②①③

D、②①③④

点击查看答案

第5题

A part of protein sequence that can form a compact three-dimensional structure and often can be independently folded is called ______.

A、Residue

B、Secondary structure

C、Motif

D、Domain

E、Subunit

点击查看答案

第6题

A single polypeptide that assembles with other polypeptides to form a protein complex is best described as which of the following?

A、Residue

B、Secondary structure

C、Motif

D、Domain

E、Subunit

点击查看答案

第7题

Select the one of the following statements that is NOT CORRECT :

A、Ion-exchange chromatograph separates proteins based upon the sign and magnitude of their charge at a given PH.

B、Two-dimensional gel electrophoresis separates proteins first on the basis of their PI values and second on their charge to mass ratio using SDS.

C、Affinity chromatograph exploits the selectivity of protein-ligand interactions to isolate a specific protein from a complex mixture.

D、Many recombinant proteins are expressed with an additional domain fused to their N-or C-terminals. One common component of these fusion domains is a ligand binding site designed expressly to facilitate purification by affinity chromatography.

E、Tandem mass spectrometry can analyze peptides derived from complex protein mixtures without their prior separation.

点击查看答案

第8题

【多选题】Consider the following structure: [图] Thi...

【多选题】Consider the following structure: ??1.png This structure is best described as which of the following?