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毒素（toxin）
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外毒素根据对宿主细胞的亲和性及作用方式等，可分为A、神经毒素、组织毒素、细胞毒素B、神经毒素、细胞毒素和肠毒素C、组织毒素、神经毒素和肠毒素D、组织毒素、器官毒素和细胞毒素E、神经毒素、组织毒素和器官毒素
考题
根据外毒素对宿主细胞的亲和性及作用方式等，外毒素可分为A、神经毒素、组织毒素、细胞毒素B、神经毒素、细胞毒素和肠毒素C、组织毒素、细胞毒素和肠毒素D、组织毒素、器官毒素和肠毒素E、神经毒素、组织毒素和器官毒素
考题
对结核杆菌致病性叙述正确的是A、内毒素（+）、外毒素（+）、侵袭酶（-）B、内毒素（-）、外毒素（-）、侵袭酶（-）C、内毒素（+）、外毒素（-）、侵袭酶（-）D、内毒素（-）、外毒素（+）、侵袭酶（-）E、内毒素（-）、外毒素（-）、侵袭酶（+）
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第二篇Are These Food Safe to Eat?Traditionally,in plant breeding,there are crossing varieties of the same species in ways they could cross naturally.For example,disease-resistant varieties of wheat have been crossed with highyield wheat to combine these properties.This type of natural gene exchange is safe and fairly predictable.Genetic engineering(GE)makes it possible to exchange genes between unrelated species that cannot exchange genes with each other in a natural way.GE can involve the exchange of genes be-tween vastly different species一e.g. putting scorpion toxin genes into maize or fish antifreeze genes into tomatoes.It is possible that a scorpion toxin gene,even when it is in maize DNA,will still get the organism to produce scorpion toxin一but what other effects may it have in this alien environment? We have already realized this problem一adding human growth hormone genes to pigs certainly makes them grow一but it also gives them arthritis and makes them cross-eyed,which was entirely out of expectation.It won't be difficult to find out,for example,that the gene for human intelligence will not have the same effect if it is inserted into cabbage DNA as it had in human DNA一but what side-effect would it have?In other words,is genetically modified(GM)food safe to eat?The answer is that no-body knows because long-term tests have not been carried out.Those companies who want a GM product approved in the UK or USA are required to provide regulatory bodies with results of their own safety tests.Monsanto's soya beans were apparently fed to fish for 10 weeks before being approved.There was no requirement for independent testing,for longterm testing,for testing on humans or testing for specific dangers to children or allergic people.The present opinion of the British Government is that"There is no evidence of long-term dangers from GM foods."In the US,the American Food and Drug Administration is now being prosecuted for covering up research that suggested possible risks from GM foods.Which type of natural gene exchange is safe and fairly predictable?A:Adding human growth hormone genes to pigs.B:Natural gene exchange in traditional plant breeding.C:Inserting fish antifreeze genes into tomatoes.D:Putting scorpion toxin genes into maize.
考题
患者虞某某，男，70岁，长期口服氯林可霉素，诱发假膜性肠炎，诊断为难辨梭菌感染。难辨梭菌产生的毒素是（）A、毒素A为肠毒素，毒素B为细胞毒素B、产生毒素A为细胞毒素，毒素B为肠毒素C、毒素AD、毒素BE、毒素C
考题
单选题Which of the following questions is answered according to the information given in the passage?A
What is the toxin used by the fish killer?B
Who first discovered the organism?C
How does the fish killer paralyze fish?D
How many fishes can the organism kill each day?
考题
单选题患者虞某某，男，70岁，长期口服氯林可霉素，诱发假膜性肠炎，诊断为难辨梭菌感染。
难辨梭菌产生的毒素是（ ）A
毒素A为肠毒素，毒素B为细胞毒素B
产生毒素A为细胞毒素，毒素B为肠毒素C
毒素AD
毒素BE
毒素C
考题
单选题根据对宿主细胞的亲和性及作用方式不同，外毒素可分为（）。A
神经毒素、组织毒素和细胞毒素B
神经毒素、细胞毒素和肠毒素C
组织毒素、细胞毒素和肠毒素D
组织毒素、器官毒素和肠毒素E
神经毒素、组织毒素和器官毒素
考题
单选题Which of the following statements is true?A
Scientists have solved the mystery about the fish killer.B
More studies need to be made about the fish killer.C
It is proved that the algae are reducing fish populations.D
Humans have already been affected by the toxin.
考题
单选题最小的毒素是（）.A
肠毒素B
毒素休克综合征毒素C
白喉外毒素D
破伤风痉挛毒素E
肉毒毒素
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