The following group of organisms without cell structure is () A. HIV and tobacco mosaic virus B. Bacteria and yeast C. True
Yanyu River
Selected answers
Topic content:
The following group of organisms without cellular structure is ()
A. HIV and TMV
B. Bacteria and yeasts
C. Fungus and influenza virus
D. Tobacco mosaic virus and lactic acid bacteria
Best answer:
A
Answer analysis:
The virus has no cell structure. It is composed of a protein shell and a small piece of genetic material wrapped inside. The virus cannot live independently, but must live in the cells of other organisms. The virus can only parasitism in living cells, relying on the genetic information in its own genetic material. Bacteria are single celled organisms, yeast is single celled fungi, and lactic acid bacteria are bacteria. They all have cell structures,Select A.
Test core:
Infectious disease: a disease caused by a pathogen that can spread between people or between people and animals is called infectious disease.Pathogens include viruses, bacteria, fungi, parasites, etc.Infectious diseases are infectious and epidemic.
The cleaning methods of elastic cloth boots are as follows: 1. Use a very soft brush or a soft cleaning cloth to roughly clean the periphery of the boots. The heel and bottom edge of the boots need to be cleaned with force;2. Use a soft cleaning cloth dipped with detergent to clean the surface of the boots carefully, and wipe the large stains on the vamp with an eraser;3. Etc
1. Most people are the same and like only the face of love.2. Falling in love with you is the only reason why I become humble.3. An experience, if it doesn't give you what you want, at least it teaches you what you don't want.4. In the future, will you think of the time you owe me if you make her love long.5. The past has
Whether to pay liquidated damages for voluntary resignation If the employer provides special training fees for the employee during the probation period, the employee needs to pay liquidated damages for voluntary resignation;If the employer and the employee can agree in the labor contract to keep the employer's trade secrets and intellectual property rights, the employee who discloses after resignation needs to pay the violation
When Shen Wansan died, he had little wealth. Most of his wealth was confiscated by Zhu Yuanzhang.Shen Wansan didn't expect that he would end up like this because he didn't know how to be modest and restrained.After his death, he had no face to go back to his hometown to meet his father and fellow villagers. So before he died, he told future generations to bury himself under the water
Spring and autumn are the Chinese zodiac chicken.The chicken is one of the twelve zodiac signs, ranking the tenth. The twelve regions are dominated by "You", so the "You Time" in the twelve hours of the day, from 5 p.m. to 7 p.m., is also called "Chicken Time".The twelve zodiac signs are the figurative representatives of the twelve branches, namely, Zi (mouse), Chou (cow), Yin (tiger), Mao (rabbit), Chen (dragon)
Smart, Chinese vocabulary, Pinyin: xi ǎǎōōō ng ming, meaning: Smart appearing in small things or details will damage the overall situation or go against the long-term.It is often derogatory.It means that although the person is intelligent, he can't act like a fool. When dealing with people, he always thinks that others will not think of him and uses his own plans and actions to achieve his own goals. Citation explanation: 1. Yuan · Tang style "Xiang Fei Yinhe Lu Jin's Rhythm" song: "Let's stop being clever and let's stop being honest." 2. The 14th chapter of "Niehai Flowers" by Jin Songcen and Zeng Pu in Qing Dynasty: "Wei Yibo smiles: 'Just because my children have ideas and cleverness, they have to keep their eyes open. I'm really embarrassed about getting married.'" 3. Lu Xun's "New Stories - Non attack": "Our fellow townsman is like a public loser. He always relies on his little cleverness to make trouble." 4. Ai Wu's "A Lesson in Philosophy of Life": "I have to be smart. It doesn't matter if I pretend to be smart." Sentence making: 1. Zhang Jian always likes to show off his cleverness in front of his classmates. 2. People who play smart are often mistaken for smart, and often make things worse. 3. You love to play such a smart trick, but which time is not self defeating, and you have corrected yourself?
The first sentence is "something happens", and the whole sentence is "something abnormal must have a demon".It means that there must be something strange if things are abnormal. It comes from "The Jade Horse Essence of Yuewei Thatched Cottage Notes" by Ji Yun of the Qing Dynasty. The original text is: on the seventh or eighth day of the year, it withered, and its roots came out of the column with connected textures. It is about two inches near the column. It is still dead wood, and the above is gradually green.First lady, Cao's nephew, I saw her when I was young.Xian Yuerui also said, and the grandfather, Mr. Xuefeng, said, "Those who are abnormal are demons. He Rui has them!"!The Cao family also declined. Translation: The flowers and leaves are luxuriant and drooping, and wither and fall after seven or eight days.The root of the flower grows from the column, and the texture is connected with the column;Two inches near the pillar, it is still dead wood, and it turns green gradually.The late mother was Cao's niece. When I was young, I saw the peonies on the hall pillars, which were regarded as auspicious signs at that time.My grandfather, Mr. Xuefeng, said, "An abnormal thing is a demon. How can there be any auspicious omen?" Later, the Cao Clan also declined. Ji Yun (1724.7.26-1805.3.14), named Xiaolan, named Chunfan, named Shi Yun in the evening, was a Taoist who watched the game and was from Xianxian County (today's Cangzhou City, Hebei Province) in Zhili.Politician and litterateur in the Qing Dynasty, officials during the Qianlong period.He served as an official Zuo Duyu, a senior official of the Ministry of War and the Ministry of Rites, and a supervisor of the Imperial College who co sponsored the Great Scholar and the Crown Prince. He once served as the chief compiler of the Siku Quanshu.
The type of Jiezi Shu is letter. Jiezi Shu is a family letter written by politician Zhuge Liang to his son Zhuge Zhan before he died. Original text: When a gentleman goes, he should cultivate his moral character by being quiet and cultivate his morality by being thrifty.No ambition can be realized without indifference, and no future can be achieved without peace.A man must learn quietly, and then he must learn. Without learning, he cannot broaden his talents, and without ambition, he cannot succeed in learning.Slowness does not stimulate the spirit, while rashness does not cure the nature.When the time flies and the day goes by, it will wither away. Many people are out of touch with the world, and they will never reach the poor house! Translation: The conduct of a gentleman is to improve his self-cultivation from tranquility and cultivate his moral character through thrift.Not being tranquil and having few desires can not define the ambition, and can not achieve the ambitious goal without excluding external interference.Learning must be concentrated, and talent comes from learning.Without learning, you can't increase your ability. Without ambition, you can't make achievements in learning.If you indulge in laziness, you will not be able to stimulate your spirit; if you are impatient and take risks, you will not be able to cultivate your temperament.Time flies with time, and will goes with time.In the end, they were withered and scattered. Most of them did not touch the world and were not used by the society. They could only sit sadly in the poor house. How could they regret it? The article expounds the profound truth of cultivating one's morality and character, pursuing scholarly pursuits and being a man.It can be seen from the text that Zhuge Liang is a father with noble character and profound talent. His ardent teachings and unlimited expectations for his son are all in this book.Through intelligent, rational, concise and prudent words, the full text expresses the love for children of all fathers in the world very deeply. It has become a famous article for the students of later generations to cultivate their moral integrity, and has been selected into the Chinese language textbooks for compulsory education in China.
The sine cosine formulas are interchangeable: sin(π/2-α)=cosα。 cos(π/2-α)=sinα。 sin(π/2+α)=cosα。 cos(π/2+α)=-sinα。 cos(π-α)=-cosα。 sin(3π/2-α)=-cosα。 cos(3π/2-α)=-sinα。 sin(3π/2+α)=-cosα。 cos(3π/2+α)=sinα。 Exchange pithy formula: odd, variable and even are unchanged, and the symbol looks at the quadrant. Sine, a mathematical term, in a right triangle, the ratio of the opposite side of any acute angle ∠ A to the hypotenuse is called the sine of ∠ A, which is recorded as sinA (abbreviated from the English word sine), that is, sinA=the opposite side/hypotenuse of ∠ A. Cosine (cosine function), a kind of trigonometric function.In Rt △ ABC (right triangle), ∠ C=90 ° (as shown in the overview diagram), the cosine of ∠ A is the hypotenuse of its adjacent side than the triangle, that is, cosA=b/c, or cosa=AC/AB.Cosine function: f (x)=cosx (x ∈ R).