问题 解答题

酵母菌和乳酸菌是发酵工业中常用的微生物,你能对它们加以比较吗?

(1)从结构上看,酵母菌属于真菌,它细胞中有真正的______,而乳酸菌

属于细菌,它的细胞中没有成形的______.

(2)从生殖方式上看,酵母菌的生殖方式是______,而乳酸菌主要进行______.

(3)从实际应用上看,酵母菌主要用在制作______,而乳酸菌主要用在制作______.

答案

(1)、(2)、酵母菌属于单细胞真菌,真菌的细胞中有真正的细胞核,酵母菌在条件适宜时进行出芽生殖,在条件不良时可进行孢子生殖;乳酸菌属于细胞,细菌细胞无成形的细胞核,细菌主要进行分裂生殖.

(3)、微生物的发酵在食品的制作中具有重要意义,如蒸馒头、做面包、酿酒要用到酵母菌,蒸馒头、做面包时,酵母菌发酵产生二氧化碳,二氧化碳是气体,遇热膨胀,使馒头、面包暄软多孔;制酸菜和酸奶要用到乳酸菌,乳酸菌发酵产生乳酸,使奶和菜具有特殊的风味.

故答案为:(1)细胞核;细胞核

(2)出芽生殖和孢子生殖;分裂

(3)馒头、面包、酒;酸菜、酸奶

多项选择题 案例分析题
阅读理解

Malaysia’s Prime Minister, Mahathir Mohamad has been retired. But he didn’t go quietly. In his final speech, he blamed the Jewish people for the problems between Israel and the Palestinians.

“The Jews have taken land of the Muslims,” he said. “What if part of America was given to the Jews as Israel? Would the Americans let it happen? Of course not.”

His words angered many western governments, but Mahathir doesn’t care. “I like to speak my mind,” the 77-year-old explained. “Sometimes people don’t like it. But that is what leadership is all about.”

Loved by some and disliked by others, his 22 years in power have seen great changes in Malaysia. He has taken it from being one of Asia’s poorest countries to the world’s 18th largest trading nation. It is also a peaceful country with native Malaysians living alongside minority groups. Chinese make up a quarter of the population, while a further 7.4 percent are of Indian origin. Teenage girls wearing Muslim headscarves happily walk around large stores as ethnic Chinese play mah-jong in nearby cafes.

But Mahathir has made enemies at home and abroad and some people will be glad he has gone. The US was unhappy when he often blamed it for globalization. Meanwhile, critics say that he has limited the freedom of the Malaysian people in order to stay in control of the country. Despite this, he is a hero to leaders in Southeast Asia as well as those in the Islamic world. “He marked out the path to success for developing nations in the region to follow,” said Thai President Thaksin Shinawatra.

Now he just wants to enjoy his retirement and insists that he will not take on a special role in government. “I’m a nobody,” he said. But many Malaysians do not agree with this.

Notes:

①    Muslim  adj. 穆斯林的

②    mah-jong  n. 麻将

③    Islamic  adj. 伊斯兰教的

Choose the best answers according to the above:

小题1:What does Mahathir probably mean by saying “But that is what leadership is all about.”?

A.The Jews have taken land of the Muslines by strong power of their leadership.

B.America should give part of its land to Israel though its leadership is powerful.

C.Leadership has the obligation to speak up what you think is right or wrong.

D.As a leader of a country, you have the right to teach those in other countries what to do and how.小题2:Which is NOT true about the following?

A.Malaysia was no longer poor after Mahathir came into power.

B.Malaysia is a country with natives and other minorities like Jews living alongside

peacefully.

C.Malaysia developed a lot within Mahathir’s power but freedom of Malaysians was

limited.

D.Mahathir’s role in the world is both a hero to leaders in Southeast Asia but also a possible enemy of some countries.小题3:The best title of this passage would be _________.

A.A Religion Enthusiast

B.Mahathir’s Political Policy

C.Mahathir Is Malaysia

D.Hero of the World