问题 填空题

89070000改写成用“万”作单位的数是(    )。

答案

8907万

读图填空题

谷氨酸是生物体内一种重要的有机小分子,其钠盐--谷氨酸钠是味精等调味品的主要成分。目前在氨基酸发酵中,谷氨酸是产量最大的种类之一。下图所示为微生物连续培养装置,据图回答

(1)图中用于谷氨酸发酵的培养基通常用豆饼的水解液、玉米浆、尿素、磷酸氢二钾、硫酸镁、生物素等配制而成。这样的培养基称为______________(多选)

A.固体培养基 B.液体培养基 C.天然培养基 D.合成培养基

(2)谷氨酸发酵生产过程中,需要添加氨水,它不仅是谷氨酸棒状杆菌生长所需的____________,而且起到调节培养液____________的作用。

(3)生产过程中,选择________期的谷氨酸棒状杆菌进行接种,________期是积累代谢产物的关键时期,_________期是菌种种内斗争最激烈的时期。

(4)当培养液中C/N比为_________时,菌体大量繁殖而产生的谷氨酸少;当pH呈酸性时,谷氨酸棒状杆菌就会生成____________;氧气不足时,会生成________或琥珀酸。这些事实说明环境条件的变化,不仅会影响菌种的生长繁殖,而且会影响菌种____________。

(5)图示的连续培养法,是在一个流动装置中,以一定的速度不断地添加新的培养基,同时又以同样的速度放出老的培养基,以保证_________,使微生物保持较长时间的高速生长。

(6)在谷氨酸棒状杆菌代谢过程中,由于存在酶活性的调节,而使谷氨酸的产量难以提高。目前提高谷氨酸产量的做法通常是_______________,从而使谷氨酸能迅速排放到细胞外,解除谷氨酸对谷氨酸脱氢酶的抑制作用。

阅读理解
BEIJING, Oct. 13 (Xinhuanet) -- A recent sudden temperature drop in most areas of China has set off fears of a possible return of severe acute respiratory syndrome (SARS) and the country has mobilized to prepare for another outbreak.  
North China's Tianjin Port resumed a temperature reporting system on Sunday. Any passengers through the port with a temperature above 38 degrees Celsius would be provided medical observation and reported to relevant authorities. 
Zhong Nanshan, a well-known anti-SARS scientist during the last outbreak, said it was unlikely the SARS virus would die out naturally and it would definitely come back, but predicted no widespread epidemic outbreak and the epidemic would not cause serious damage again.
Caught unprepared this spring, Chinese authorities have learned to act quickly before the epidemic can take a hold.
Chinese Vice-Premier Wu Yi Thursday urged strictly implementing the daily SARS epidemic reporting system and warned that people delaying reporting or hiding the true situation would be severely punished.
In Beijing, the disease control center in Dongcheng District has recovered a 24 hour schedule for possible epidemic breakout. Every afternoon before 3:00 o'clock, the center receives SARS reports from every hospital in the district and then reports to the Beijing municipal disease control center and health bureau.
In Beijing Xiehe Hospital, plans are ready for fever patients to receive treatment in a special section. Doctors in that ward, wearing protective clothing, will observe patients for any possible respiratory diseases. Patients with high fever and symptoms of respiratory diseases are required to be observed for one or two weeks.
North China's Shanxi Province and Inner Mongolia Autonomous Region, the two other hardest-hit areas in the last SARS crisis, have both set up an emergency response mechanism and mobilized all concerned departments. The system has also been set up in rural Inner Mongolia.
People are urged to pick up again the healthy habits they formed during the last SARS outbreak. Zhong Nanshan said the most important way to prevent SARS was to play more sports and maintain good ventilation. Spitting in public and eating wild animals were very dangerous, said Zhong.  
小题1:This passage is mainly about_______.
A.Zhong Nanshan, a well-known anti-SARS scientist
B.What happened during the first outbreak of SARS
C.How well China is prepared for another likely outbreak of SARS
D.What hospitals in Beijing have done
小题2:Which isn’t included in the measures taken by the Chinese?
A.A temperature reporting system.B.The daily SARS epidemic reporting system.
C.A 24-hour schedule for possible epidemic breakout.
D.An emergency response mechanism all over the country.
小题3:Which doesn’t belong to Beijing’s reaction to the possible epidemic?
A.SARS reports must be given to the disease control center and health bureau.
B.Fever patients receiving special sections are ready.
C.High fever patients are to be observed for 3 weeks.
D.Doctors treating high fever patients will wear protection clothes.