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根据以下材料，回答题DNA FingerprintingDNA is the genetic material found within the cell nuc

根据以下材料，回答题

DNA Fingerprinting

DNA is the genetic material found within the cell nuclei of all living things. In mammals the strands of DNA are grouped into structures called chromosomes. With the exception of identical siblings （as in identical twins）， the complete DNA of each individual is unique.

DNA fingerprinting is sometimes called DNA typing. It is a method of identification that compares bits of DNA. A DAN fingerprint is constructed by first drawing out a DNA sample front body tissue or fluid such as hair， blood， or saliva. The sample is then segmented using enzymes，and the segments are arranged by size. The segments are marked with probes and exposed on X-ray film， where they form. a pattern of black bars- the DNA fingerprint. If the DNA fingerprints produced from two different samples match， the two samples probably came from the same person.

DNA fingerprinting was first developed as an identification technique in 1985. Originally used to detect the presence of genetic diseases， it soon came to be used in criminal investigations and legal affairs. The first criminal conviction based on DNA evidence in the United States occurred in 1988. In criminal investigations， DNA fingerprints derived from evidence collected at the crime scene are compared to the DNA fingerprints of suspects. Generally， courts have accepted the reliability of DNA testing and admitted DNA test results into evidence. However， DNA fingerprinting is controversial in a number of areas: the accuracy of the results， the cost of testing，and the possible misuse of the technique.

The accuracy of DNA fingerprinting has been challenged for several reasons. First， because DNA segments rather than complete DNA strands are "fingerprinted" ; a DNA fingerprint may not be unique; large-scale research to confirn the uniqueness of DNA fingerprinting test results has not been conducted. In addition， DNA fingerprinting is often done in private laboratories that may not follow uniform. testing standards and quality controls. Also， since human beings must interpret the test， human error could lead to false results.

DNA fingerprinting is expensive. Suspects who are unable to provide their own DNA to experts may not be able to successfully defend themselves against charges based on DNA evidence.

Widespread use of DNA testing for identification purposes may lead to the establishment of a DNA fingerprint database.

If two sisters are identical twins， their complete DNAs are __________. 查看材料

A.the same

B.unique

C.different

D.similar

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发布时间：2021-04-26
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更多“根据以下材料，回答题DNA FingerprintingDNA is the genetic material found within the cell nuc”相关的问题

第1题

根据下面短文内容，回答题。 "Lucky" Lord Lucan——Alive or Dead ？ The British pu

根据下面短文内容，回答题。

"Lucky" Lord Lucan——Alive or Dead ？

The British public are still interested in the murder case because__________. 查看材料

A.the murder was a aristocrat

B.the murder"s DNA has been found

C.the murder was a famous man

D.the murder has not been caught

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第2题

根据以下资料，回答题。＜IMG nerror=jQuery.utils.imgErrorCallback（this） src="http://im

根据以下资料，回答题。

＜IMG nerror=jQuery.utils.imgErrorCallback（this） src="http://img.shangxueba.cn/files/20141104/20141104134737_1884.jpg" "＞查看材料

2003——2011年，累计完成全社会固定资产投资额为

A.1523431

B.1448711

C.1384561

D.1267751

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第3题

根据以下资料。回答题。 2009～2012年中国农村居民家庭人均消费支出 2009。2012年，

根据以下资料。回答题。

2009～2012年中国农村居民家庭人均消费支出

根据以下资料。回答题。 2009～2012年中国农村居民家庭人均消费支出 2009。2012年，根据2009。2012年，中国农村居民家庭人均消费支出年均增加约： 查看材料

A.478．63元

B.638．17元

C. 957．25元

D.1914．50元

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第4题

根据材料，回答题 可导致软骨关节病损、跟腱炎症，18岁以下儿童禁用的抗菌药物是（）

根据材料，回答题

可导致软骨关节病损、跟腱炎症，18岁以下儿童禁用的抗菌药物是（）。 查看材料

A.林可霉素类

B.酰胺醇类（氯霉素）

C.四环素类

D.氨基糖苷类

E.氟喹诺酮类

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第5题

根据以下答案，回答题

斑鳖 肿斑鳖素的含量测定采用

查看材料

A.紫外一可见分光光度法

B.薄层色谱扫描法

C.气相色谱法

D.高效液相色谱法

E.毛细管电泳色谱法

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第6题

根据短文内容，回答题。 Good Table MannersManners play an important part in making a favora

根据短文内容，回答题。

Good Table Manners

Manners play an important part in making a favorable impression at the dinner table. Here are some general rules:

Napkin (餐巾 ) use:

The meal begins when the host unfolds his or her napkin. This is your signal to do the same,so place your napkin on your lap. Unfold it completely if it is a small napkin, or in half, lengthwise(纵向地) , if it is a large dinner napkin.

If you need to leave the table during the meal, place your napkin on your chair as a signal to your server that you will be returning. Once the meal is over, place your napkin neatly on the table to the right of your dinner plate. Do not refold it.

Use a napkin only for your mouth. Never use it for your nose, face or forehead.

Use of utensils (餐具):

Start with the knife, fork or spoon furthest from your plate, and work your way in, using one utensil for each course.

If soup is served, remember to spoon away from yourself. This helps stop the drips. Do not put the entire soup spoon in your mouth. Instead, fill a soup spoon about 75 percent with soup, and sip(啜饮) it from the side noiselessly.

After finishing dinner, place the knife and fork parallel to one another across the plate with the knife blade facing inward toward the plate.

Using your fingers:

Here&39;s a list of finger foods: sandwiches, cookies, small fruits or berries with stems, French fires and potato chips, and hamburgers.

Chew (咀嚼) with your mouth closed and don&39;t make noise: don&39;t talk with your mouth full.

Bread must be broken with your hands. It is never cut with a knife.

Don&39;t pick something out of your teeth. Instead, excuse yourself to the bathroom.

If possible, try not to cough at the table.

Do not put your elbows (肘 ) on the table. In France, it is essential to have both hands above the table at the same time.

Do not put bones or anything else on the table. Things that are not eaten should be put on your plate.

Where is the napkin normally placed during the meal？ 查看材料

A.On your chair

B.On the table

C.On your lap

D.On your plate

点击查看答案

第7题

请根据短文的内容，回答题。 Good Table MannersManners play an important part in making a fav

请根据短文的内容，回答题。

Good Table Manners

Manners play an important part in making a favorable impression at the dinner table. Here are some general rules:＜br＞

Napkin (餐巾 ) use:＜br＞

The meal begins when the host unfolds his or her napkin. This is your signal to do the same,so place your napkin on your lap. Unfold it completely if it is a small napkin, or in half, lengthwise(纵向地) , if it is a large dinner napkin.＜br＞

If you need to leave the table during the meal, place your napkin on your chair as a signal to your server that you will be returning. Once the meal is over, place your napkin neatly on the table to the right of your dinner plate. Do not refold it.＜br＞

Use a napkin only for your mouth. Never use it for your nose, face or forehead.＜br＞

Use of utensils (餐具):＜br＞

Start with the knife, fork or spoon furthest from your plate, and work your way in, using one utensil for each course.＜br＞

If soup is served, remember to spoon away from yourself. This helps stop the drips. Do not put the entire soup spoon in your mouth. Instead, fill a soup spoon about 75 per cent with soup, and sip(啜饮) it from the side noiselessly.＜br＞

After finishing dinner, place the knife and fork parallel to one another across the plate with the knife blade facing inward toward the plate.＜br＞

Using your fingers:＜br＞

Here&39;s a list of finger foods: sandwiches, cookies, small fruits or berries with stems, French fires and potato chips, and hamburgers.＜br＞

Chew (咀嚼) with your mouth closed and don&39;t make noise: don&39;t talk with your mouth full.＜br＞

Bread must be broken with your hands. It is never cut with a knife.＜br＞

Don&39;t pick something out of your teeth. Instead, excuse yourself to the bathroom.＜br＞

If possible, try not to cough at the table.＜br＞

Do not put your elbows (肘) on the table. In France, it is essential to have both hands above the table at the same time.＜br＞

Do not put bones or anything else on the table. Things that are not eaten should be put on your plate.

Where is the napkin normally placed during the meal？ 查看材料

A.On your chair

B.On the table

C.On your lap

D.On your plate

点击查看答案

第8题

根据下面短文内容，回答题。 Public Relations __________

根据下面短文内容，回答题。

Public Relations

__________ 查看材料

A.matter

B.form

C.system

D.direction

点击查看答案

第9题

根据所给资料，回答题。 查看材料 A.3996B.4026C.4196D.4456

根据所给资料，回答题。根据所给资料，回答题。 查看材料 A.3996B.4026C.4196D.4456根据所给资料，回答查看材料

A.3996

B.4026

C.4196

D.4456

点击查看答案
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