“请祝我生日快乐”用英语怎么说

My birthday was passing, then I am sixteen year-old now. On my birthday, there were tourteen friends coming my birthday party. Lucy was bringing a fruit birthday cake to me, Tom was bringing two bottles of red wine, and Linda was taking a bunch of strawberries. And I was prepairing a lot of foods, we were sharing our stuffs together, and were dancing with music and were taking a lots of photos, and had a great time on my birthday party. 我的生日是过去了,现在我是十六岁了.在我生日那天,有14个朋友来参加我的生日聚会.露西带着生日水果蛋糕给我,汤姆带了两瓶红酒,和琳达带来一串的草莓.我准备了很多的食物,我们分享我们的东西在一起,我们随著音乐跳舞,并照了很多照片,在我的生日聚会我们有非常美好的时光在.

My birthdayMy birthday is in summer. It is a good season. It is Children"s Day. It is often fine. All the children are happy on the day. Me,too. Because it is also my birthday. I feel good. I always invite my good friends to my house for the party. We often sing and dance. We often play computer games. We often have fun. I am very happy on the day.我的生日我的生日在夏天。它是一个好季节。是儿童节。天气常常是晴朗的。所有的孩子在这一天都快乐。我也是。因为也是我的生日。我觉得心情很好。我总是邀请我的好朋友来我家吃饭。我们经常唱歌、跳舞。我们经常玩电脑游戏。我们经常玩的开心。我在这一天很快乐。

Today is my birthday,i"m very very very very very very very (此处省略70个very）happy.

My birtiday is on XXX. I always have both happy and sad feelings on my birthday. Why I am happy? I have group of friends that e over to celebrate with me. And they give me birthday presents, sometimes the gifts surprised me very much. Also, I can feel how much my family loves me because my parents always make a birthday cake for me. They do not go to buy one, but make one themselves. I feel so happy about that. However, I understand my mother was the one who suffered the most pain on the date I came to the world. I feel so sorry for my mother for what she had suffered. But I promise her, I will take good care of her when I have that ability.,1,你的回答完美的解决了我的问题，谢谢！,蛋糕礼物家人,2,Today is mybirthday!I am very excited,because I have a big birthdaycake !Listen!My friend is ing.We are playing puter cames .This is happy day.,0,

My birthday my name is Jom.I"m 13 years old and mybirthday in July 15th.Today was my birthany I very happy.In the afternoon l and my father ,mother go to ate KFC.In the night we ate cake at home. 或 My birthday Yesterday was my birthday.I am 12 years old now. I was very happy,because my mother took me to the zoo.I saw many animals in the zoo,for example,panda,monkey,elephant and tiger. She give me 20￥ too.I bought a English book and a beautiful pen. I love my mother and I like birthday. 生日 昨天是我的生日,我12岁啦. 我非常高兴,因为我妈妈带我去动物园了.在动物园,我看到了许多的动物,比如熊猫,猴子,大象,老虎. 妈妈给了我20块钱,我买了一本英语书和一支漂亮的钢笔. 我爱我的妈妈,也喜欢我的生日. My birthday Last birthday,i had a big party.My birthday in on (日期）.I invited my best friends,my classmates and my teachers.We were very happy.We went to a park and had a barbecue.It was delicious.Then we flew kites on a grassy lawn.After that,we went back home.My friends,teachers and my family gave me a lot of presents,such us a toy bear,a notebook and a WII.I was surprised.And we ate a big birthday cake.What a happy day!

My birthday is on May.

Yesterday was May 2nd. It was my birthday. I had a party. I ate too much. Mike brought a carton of ice cream. Jenny brought some candy. Mary brought a lot of cookies. My mom made a cake. My dad bought a toy car for me. I was very happy. At the party we sang and danced. We had a good time. 昨天是5月2日，是我的生日。我有一个聚会。我吃了太多。迈克带一盒冰淇淋。珍妮带了一些糖果。玛丽带来了很多饼干。我妈妈做了一个蛋糕。我爸爸给我买了一辆玩具车。我非常高兴。在派对上我们唱歌跳舞。我们有一个美好的时光。

今天是我的生曰。

My birthday will e.I will have a birthday part.My birthday is on .(几月几号） .My friends will arrive at my home.We will play "muscal chairs".We will eat a cake.We will sing "Happy Birthday".We will have a good time. 自己写的 全手打,24,

谢谢！你帮了一帮个大忙

1.Yesterday was May 13th2.直接用I like

Hello,my name is Sally.I am 14 years old.My birthday is Apirl sixteen.And last day is my birthday.My mother gave a dall for me as my birthday present. At that night ,I have a birthday party at my home.Fist,my good friend LiMing and Jane gave me some nice flowers for me ,after that, my mother show us a big cake.They sang the "Happy birthday to you"for me .everyone were very happy.

一般来说都是用的onmybirth啥啥用at可以说atmybirthdayparty可能在俚语里人们用久了就出现了atmybirthday这种派生吧官方来讲还是用onmybirth

MY FAVORITE JOB MY FAVORITE JOB IS TO BE A DOCTOR. A DOCTOR CAN HELP MANY PEOPLE. IF I BECOME A DOCTOR I COULD SAVE PEOPLE"S LIFE, I WILL BE VERY PROUD OF IT! BUT BEFORE I COULD BE A DOCTOR, I"M GONNA BE A STUDENT. I"M GONNA LEARN LOTS OF STUFF, I WILL BE GRADUATED IN COLLEGE(大学) , SO THAT WAY I CAN HAVE ENOUGH KNOWLEDGE TO BE A DOCTOR!!写得不够好 说不定还有语法错误 我和你差不多大。。。 差不多这水平刚好让你交差~~

There are three people in my family. They are my father,my mother and I.My father is a doctor.And my mother is a nurse.I think they are very professional and good-hearted.I think that this career is sacred.When I grow up,I will be a policewoman.Because I want to help others.I believe I can do this job.

我最喜爱的工作

My ambition is to be a teacher, so my favourite job is teacher. Teachers are hardworking and beautiful as well. They are the engineers of the people"s soul. They devote themselves to the students but they ask for nothing. I still remember the name"TanqianQiu". I regard him as my personal hero.Teachers are great and I admire them very much. I think that I"ll be a good teacher in the future.

In the recent years with the demand for different skills, experiences and qualifications increasing, the job market has become competitive. Nevertheless, I will prefer to work for an employer. Reason being, to run a business person requires lots of experience and fund. In business there is high risk and high return. Whereas in doing job I will have take just take care of my responsibilities towards my employer. While working as employee I can achieve responsible post with less risk or I can say there is no direct risk.I think, self-employment and business requires ample of knowledge and experience and above to all of this, it is not possible to run business without money. Whereas, I can work in any apex organization on the basis of my qualification and knowledge. There are various advantages in working for employer. First of all I will start getting revenue without any investment. Second advantage of doing job is, there is less responsibility in comparison to business. Working for other employer will help me in maintaining proper schedule. There is less mental stress in job. I will be able to switch to other company in adverse conditions like recession. Like son has less responsibility, when he lives with his father and once he starts living his own life his responsibilities and stress both increases. I think there is same relation between employer and employee. Employer is like father who is bearer of all risk and stress whereas employee is like son who has to just follow his guidance. I think job will give me more opportunity to work at different regions of country and outside country, because of transfers and opportunity of switching.At last I think, in job there is more freedom, less risk, zero investment and lots of opportunity. In job there are chances of getting new jobs once one loses existing. At the same time if business closes it is hard to recover again easily.

My favourite job is that of an artist.我最喜欢的工作是艺术家的工作。that代指job，即job of an artist艺术家的工作

My Favorite ProfessionIf you are a junior (大三学生) or a senior (大四学生), you may be frequently asked, "What would you like to do in the future?" Whenever people ask me this question, my answer isalways the same, "To be a teacher."Teaching has been my favorite profession all the time. My dream of being a teacher was rooted in my childhood. The good natured, patient and strict teachers in primary school made a strong impression on me. As I grow up, I know more about my desired profession. Teachers are the engineers of human soul. That is to say, they play roles in the forming and shaping(塑造) of students＇ intellectual and psychological make-up. Teachers are lifelong learners while instructing students.Nowadays governments at all levels put more stress on the roles of education in information society, versatile (多才多艺的) teachers are urgently needed. To be a qualified teacher in the new century, I must prepare right now. Rosy(玫瑰色的) dream and firm will can not be automatically translated into(转化为) teaching methods and job skills. In short, I will make efforts to do well my favorite job teaching.

my favourite job my favourite job is teacher. Teachers ar e hardworking and beautiful as well. Th ey are the engineers of the people"s so ul. They like the students. I still remem ber the name"xxx". I regard him as my personal hero. Teachers are great and I like them very much. I think that I"ll be a good teacher in the future. 我最喜欢的工作是老师。老师是勤劳的和 美丽的。他们的工程师是人类的灵魂师。 他们喜欢学生,什么也。我仍然记得这个 名字“xxx”。我把他看作我的个人英雄。 老师是伟大的,我非常喜欢他们。我认为 在未来我会成为一个好老师。

My favorite job 　　I want to be a storekeeper in the future. It"s a relaxing and easy job, and it"s very comfortable for me. In my store, I will put something I like in the case of my store, for example, some books, some toys, some collection or other nice things. I like all these things, and I like to share them with my customers who enjoy them just like me. When I am free, I can read a book, listen to a CD or surf the Internet in my store. How relaxed and happy I will be!第2篇My favorite job is to be a teacher in a university. That was my dream in my childhood. I like this job, because the most important reason is that I would love to stay together with young boys and girls. They are lively and high-spirited. Not only I can teach them the knowledge of nature science, but also they can make me informative and feel younger. Furthermore, in the university I would do my own investigation in part time. Every year, I have three-month holidays. On holidays, I can do what I want to do such as traveling with my family, relaxing myself. That is my job, I will make efforts to do well my favorite job

My favorite job is the Police. The following are the reasons why I love this job. First of all, I think this job will make life very fulfilling. Second, this career can maintain social order. The police can also help many people. In addition, the police have better income我最喜欢的职业是警察。以下是我喜欢这个职业的理由。首先，我认为这个职业会使生活很充实。其次，这个职业可以维护社会治安。警察也可以帮助很多市民。另外，警察收入也比较好

My favorite job 　　I want to be a storekeeper in the future. It"s a relaxing and easy job, and it"s very comfortable for me. In my store, I will put something I like in the case of my store, for example, some books, some toys, some collection or other nice things. I like all these things, and I like to share them with my customers who enjoy them just like me. When I am free, I can read a book, listen to a CD or surf the Internet in my store. How relaxed and happy I will be!

My favorite job is to be a teacher.Because I can pass on my knowledge and ideas to my students through teaching. Similarly, I can discover the other side of the world by getting along with the students.Moreover, when you see groups of students grow into pillars of national construction, the satisfaction and gratification are self-evident.I believe that one day, I will become a teacher, and let the children thrive under my cultivation.

everyoneshouldbecomeacriticalthinkerinmyclass,andiwanttobeagoodteacherinitsreals每个人都应该成为一个重要的思想家在我班上，我想成为一名好老师在其真正的县

有时候我会感到累。有时候。如果我成为了一名教师，所以我每天都会很快乐。我非常喜欢孩子。我认为我会成为一名好教师，我也会在外面工作，因为我认为教师很了不起我想成为一名教师，我将努力教我的学生。我的工作将和孩子们一起，但我能从我的工作中获得更多，但是我会每天都努力工作

I want to be a teacher because I think they are great. If I become a teacher,I will work hard to teach my students. I will work with the children. I love children very much,so I will be happy every day. I will also be able to work outside sometimes. but I will work hard every day,sometimes I will be tired. I can also get more job from my job. I think I will be a good teacher

I"m a good boy,my favorite job is police.i want to be a policeman in the future.my favorite teacher is miss Lin.she is strict and friendly

【2011 山东青岛】Ⅸ.书面表达 假设你喜欢的老师是Mr. Wang 或者Ms. Wang.请根据下面的提示，以My favorite teacher 为题目，用英语写一篇短文。 要求：1. 必须包括①description ②friendship ③the best quality 三个方面的内容，括号内的提示可以任意选择或可以适当发挥。 2.文中不得出现真实姓名或学校。 3.字数(80-100)(文章题目和开头已经给出，不计入总次数) favorite teacher: ①description ②friendship ③the best quality (kind; warm-hearted; strict; helpful )My favorite teacher is My favorite teacher is Ms. Wang. She is a 36- year-old woman. But she is tall and has long straight hair. And she often wears black pants and a white shirt. She teaches us English. We all like listening to her. Her classes are very interesting and creative. Because she has different ways of teaching. But she is very strict with us in everything. She is warm-hearted. We all know she is always ready to help others. When we are in trouble, she can try her best to help us. We all like her, and she likes us, too.

My favourite job is being a policeman someday. First of all, being a policeman is very cool. Secondly, as a basically duty of a policeman, beating down criminals benefits a lot to the society.So I want to be a policeman.

My dream JobI am a fourteen-year-old boy,a middle school student in Changjiang Middle School.Although All of us are students now,I believe every student can speak out his or her dream job in the future.My dream job is to be a doctor.I want to be a famous doctor in the future.I like to help patients and let them healthy.The doctor"s work will be busy but interesting.My teacher said I was good at biology and Chinese.But I still need to improve my English,too,then I can read medical knowledges in English and the patients from all over the world can get my helps.

问题一：酵母菌是不是原核生物？ 酵母菌有细胞膜。 细菌与叫酵母菌的区别： 细菌为原核生物（有拟核区），而酵母菌为真核生物（有细胞核），更准确的说是真菌。 另外，原核生物只有简单的细胞器：核糖体 而真核生物有一系列复杂的细胞器。这应该就是他们最大的差别 问题二：酵母菌是真核生物还是原核生物 酵母菌有细胞膜。 细菌与叫酵母菌的区别： 细菌为原核生物（有拟核区），而酵母菌为真核生物（有细胞核），更准确的说是真菌。 另外，原核生物只有简单的细胞器：核糖体 而真核生物有一系列复杂的细胞器。这应该就是他们最大的差别，酵母菌属于真菌。而真菌是真核生物，而醋酸菌是原核生物。区分真核生物还是原核生物主要看有无核膜，一般蓝（蓝藻）、细（细菌）、线（放线菌）、支（支原体）、衣（衣原体）是原核生物 。 问题三：酵母菌是原核生物还是，真核生物？ 含有细胞核核膜，真核生物，兼性厌氧。 问题四：根霉菌是不是原核生物 绿藻是真核生物 除了蓝藻（念珠藻，颤藻，圆球藻）以外的藻类都是真核生物！绿藻，红藻，黑藻，褐藻等等都是真核，他们能进行光合作用，所以是有叶绿体的。 真菌通常分为三类,即酵母菌、霉菌和蕈菌（大型真菌）,是低等的真核生物. 细菌是生物的主要类群之一,属于细菌域.包括真细菌（eubacteria）和古生菌（archaea）两大类群.细菌为原核微生物的一类,是一类形状细短,结构简单,无成形细胞核,无核糖体以外的细胞器,一般以简单的二分裂法进行无性繁殖对抗生素敏感. 霉菌是形成分枝菌丝的真菌的统称,靠孢子繁殖,有些霉菌产抗生素. 问题五：大肠杆菌是否为原核生物还是真核生物 原核 问题六：酵母菌是不是原核生物？ 酵母菌有细胞膜。 细菌与叫酵母菌的区别： 细菌为原核生物（有拟核区），而酵母菌为真核生物（有细胞核），更准确的说是真菌。 另外，原核生物只有简单的细胞器：核糖体 而真核生物有一系列复杂的细胞器。这应该就是他们最大的差别 问题七：酵母菌是真核生物还是原核生物 酵母菌有细胞膜。 细菌与叫酵母菌的区别： 细菌为原核生物（有拟核区），而酵母菌为真核生物（有细胞核），更准确的说是真菌。 另外，原核生物只有简单的细胞器：核糖体 而真核生物有一系列复杂的细胞器。这应该就是他们最大的差别，酵母菌属于真菌。而真菌是真核生物，而醋酸菌是原核生物。区分真核生物还是原核生物主要看有无核膜，一般蓝（蓝藻）、细（细菌）、线（放线菌）、支（支原体）、衣（衣原体）是原核生物 。 问题八：根霉菌是不是原核生物 绿藻是真核生物 除了蓝藻（念珠藻，颤藻，圆球藻）以外的藻类都是真核生物！绿藻，红藻，黑藻，褐藻等等都是真核，他们能进行光合作用，所以是有叶绿体的。 真菌通常分为三类,即酵母菌、霉菌和蕈菌（大型真菌）,是低等的真核生物. 细菌是生物的主要类群之一,属于细菌域.包括真细菌（eubacteria）和古生菌（archaea）两大类群.细菌为原核微生物的一类,是一类形状细短,结构简单,无成形细胞核,无核糖体以外的细胞器,一般以简单的二分裂法进行无性繁殖对抗生素敏感. 霉菌是形成分枝菌丝的真菌的统称,靠孢子繁殖,有些霉菌产抗生素.

酵母菌不属于植物，它既不是植物也不是动物，它属于微生物里的细菌，是一种叫做真菌的生物，通常会在做面包会在酿酒的时候用到，它以糖类、淀粉以及其它工农业副产物来作为原料的。酵母菌属于植物吗酵母菌不属于植物，它既不是植物也不是动物，它属于微生物里的细菌，是一种叫做真菌的生物，通常会在做面包会在酿酒的时候用到，它以糖类、淀粉以及其它工农业副产物来作为原料的。酵母菌是什么植物酵母菌不属于植物，它属于酵母科，是一种单细胞真菌，不是系统演化分类的单元，在生活中是不能通过肉眼直接观察的，它是十分微小的一种单细胞微生物，可以将糖发酵为酒精以及二氧化碳，然后分布于自然界。酵母菌样子与特点酵母菌属于细胞形态，它的细胞宽度为2-6μm，长度为5-30μm，有的更长，它们的个体形态各异，有的为球状，有的则是卵圆或者椭圆、柱状、香肠状等，是一种高等的微生物真菌类。酵母菌是无害的，比较容易生长，在空气中、土壤中、水中，甚至是动物的体内都可以存在，而且无氧或者有氧都能存活，生命力极强，可以通过无性繁殖和有性繁殖进行生存。

单细胞因为它由一个细胞构成书上应该有图片的啊

乳酸菌的全称是乳酸杆菌在我们常见的带菌字的生物中凡是带球杆弧螺旋字样的都是细菌属于原核酵母菌是单细胞真核生物,是一种真菌，属于真核大肠杆菌属于细菌，属于原核

A、从代谢类型上看，酵母菌、乳酸菌属于异养生物，硝化细菌、蓝藻属于自养生物，A正确； B、从结构上看，酵母菌为真核生物，乳酸菌、硝化细菌、蓝藻属于原核生物，烟草花叶病毒、噬菌体属于病毒，B错误； C、烟草花叶病毒（RNA病毒）由RNA和蛋白质组成，C错误； D、⑤⑥属于生命系统，其增殖离不开活细胞，D正确； 故选：AD．

A、大肠杆菌属于细菌，没有成形的细胞核，是原核生物，属于最低等生物；螺旋藻属于蓝藻的一种，也是原核生物，属于最低等生物；A正确； B、绿眼虫是原生动物，属于真核生物，酵母菌属于真菌，也属于真核生物，不属于最低等生物，B错误； C、绿眼虫是原生动物，属于真核生物，不属于最低等生物，C错误； D、酵母菌属于真核生物，不属于最低等的生物，D错误． 故选：A．

酵母菌属于植物吗酵母不是一种植物。它既不是植物也不是动物。属于微生物中的细菌。这是一种叫做真菌的生物。它通常用于制作面包和葡萄酒。它以糖、淀粉等工农业副产品为原料。酵母菌是什么植物酵母不属于植物。它属于酵母属。它是单细胞真菌，不是系统进化和分类的单位。在生活中无法用肉眼直接观察到。它是一种微小的单细胞微生物，能将糖发酵成酒精和二氧化碳，然后分布在自然界中。酵母菌样子与特点它属于酵母细胞形态学。其细胞宽度为2-6m，长度为5-30m，有的更长。它们的个体形态各不相同，有的是球形，有的是椭圆形或卵圆形、柱状、香肠状等。它是一种高等微生物真菌。酵母是无害的，易于生长，可以存在于空气、土壤、水中，甚至动物身上尸体。而且它可以在无氧或缺氧的情况下生存，生命力很强。它可以通过无性繁殖和有性繁殖存活。

酵母菌无氧呼吸产生了乳酸。酵母是单细胞微生物。它属于高等微生物的真菌类。有细胞核、细胞膜、细胞壁、线粒体、相同的酶和代谢途径。酵母无害，容易生长，空气中、土壤中、水中、动物体内都存在酵母。有氧气或者无氧气都能生存。大多数酵母菌的菌落特征与细菌相似，但比细菌菌落大而厚，菌落表面光滑、湿润、粘稠，容易挑起，菌落质地均匀，正反面和边缘、中央部位的颜色都很均一，菌落多为乳白色，少数为红色，个别为黑色。

是的，这个东西呢，如果身体有。哦，禁止使用发性物质的话是不能够使用他的。

酵母菌既不是植物也不是动物，而是一种单细胞真菌。

你的这个提问就有问题。酵母菌也是真菌。从组成真菌个体的细胞数目来看，酵母菌属于单细胞真菌，霉菌、蕈类（如蘑菇、灵芝等）等属于多细胞真菌。酵母菌和霉菌等都是真菌，但酵母菌是单细胞生物，一个细胞就是一个完整的生物个体。而霉菌等是多细胞生物，许多个细胞按照功能不同，以不同的方式组合起来，共同组成一个生物个体。酵母菌是单细胞生物霉菌是多细胞生物

真菌

好象是Saccharomyces cerevisiae

不是。酵母菌是单细胞生物，在有氧和无氧环境下都能生存，属于兼性厌氧菌。多细胞生物是指由多个，分化的细胞组成的生物体，其分化的细胞各有不同的，专门的功能。

酵母菌是真菌,属于真核生物. 细菌是原核生物. 两者的主要区别是：酵母菌有细胞核（有核膜核仁）,而细菌没有真正的细胞核,只有拟核.

摘要：酿酒酵母菌的作用主要分为工业上和医药上，其中工业上作用是发酵，在无氧的条件下，经过内酶的作用，把单糖分解为二氧化碳和酒精。那么酿酒酵母菌最适发酵温度是多少呢？一般为30-33℃最为适宜，较高温度时，酵母菌发酵生长繁殖快，但衰老也加快，且易感染杂菌。具体的酿酒酵母菌的作用是什么以及酿酒酵母菌最适发酵温度是多少，一起到文中来看看吧！一、酿酒酵母菌的作用是什么酿酒酵母菌属于酵母菌科，是一种单细胞生物，成卵圆形或球形，繁殖方式为出芽繁殖，孢子繁殖，接合繁殖三种，形态简单但生理复杂，那么你知道酿酒酵母菌的作用是什么吗？1、在工业上用于酿酒，酵母菌将葡萄糖、果糖、甘露糖等单糖吸入细胞内，在无氧的条件下，经过内酶的作用，把单糖分解为二氧化碳和酒精。此作用即发酵。2、在医药上，因酵母菌富含维生素B、蛋白质和多种酶，菌体可制成酵母片。治疗消化不良，并可从酵母菌中提取生产核酸类衍生物、辅酶A、细胞色素C、谷胱甘肽和多种氨基酸的原料。二、酿酒酵母菌最适发酵温度是多少酿酒酵母菌发酵过程消耗淀粉产生酒精，每克淀粉发酵释放出770焦耳热量，若以酒醅含水量60%计算，当酒醅淀粉浓度由于发酵降低1%时，酒醅升温2.4℃（理论值），但由于生产副产物等损耗，实际升温幅度在2℃左右。由此可见发酵酒醅的淀粉浓度是控制发酵升温的基础。酿酒酵母菌最适生长的最适温度是27-30℃，最适发酵温度是30-33℃。当酒醅发酵温度升高时，又有发酵产生酒精的存在，酵母菌发酵力受很大抑制，较高温度（36℃）左右酵母菌发酵生长繁殖快，但衰老也加快，且易感染杂菌。而较低的温度（28℃）左右，酵母菌的酶活性不易被破坏，发酵持续性强，对糖分利用彻底，出酒率也较高。

　　酵母菌发酵后的最终产物是：酒精或二氧化碳。酵母菌在厌氧条件下进行发酵作用，会生成酒精。酵母菌在有氧条件下，进行正常的呼吸作用，则会变成二氧化碳。酵母菌发酵原理是酵母菌进行无氧呼吸产生乳酸，酵母菌分解葡萄糖产生丙酮酸，接着把丙酮酸放在缺氧和微酸性的条件下，则会转变成酒精。　　酵母是基因克隆实验中常用的真核生物受体细胞，培养酵母菌和培养大肠杆菌一样方便。 　　酵母是一种单细胞真菌，并非系统演化分类的单元。一种肉眼看不见的微小单细胞微生物，能将糖发酵成酒精和二氧化碳，分布于整个自然界，是一种典型的异养兼性厌氧微生物，在有氧和无氧条件下都能够存活，是一种天然发酵剂。　　酵母是单细胞微生物。它属于高等微生物的真菌类。有细胞核、细胞膜、细胞壁、线粒体、相同的酶和代谢途径。酵母无害，容易生长，空气中、土壤中、水中、动物体内都存在酵母。有氧气或者无氧气都能生存。　　酵母是兼性厌氧生物，未发现专性厌氧的酵母，在缺乏氧气时，发酵型的酵母通过将糖类转化成为二氧化碳和乙醇(俗称酒精)来获取能量。

酵母菌不是原核生物，属于真核生物，(包括真菌，动植物细胞) ，而原核生物有细菌，蓝藻，放线菌，衣原体支原体等细胞。原核生物的基本信息：原核生物(Prokaryotes)是原核细胞组成的生物，没有成形细胞核或线粒体的一类单细胞，包括蓝细菌、细菌、放线菌、螺旋体、支原体等。70年代分子生物学的资料表明:产甲烷细菌、极端嗜盐细菌、极端耐酸耐热的硫化叶菌和嗜热菌质体等的16S rRNA核苷酸序列，既不同于一般细菌，也不同于真核生物。此外，这些生物的细胞膜结构、细胞壁结构、辅酶、代谢途径、tRNA和rRNA的翻译机制均与一般细菌不同。因而有人主张将上述的生物划归原核生物和真核生物之外的"第三生物界"或古细菌界。真核生物的基本信息：真核生物eukaryotes 由真核细胞构成的生物。包括原生生物界、真菌界、植物界和动物界。定义 真核生物是所有单细胞或多细胞的、其细胞具有细胞核的生物的总称，它包括所有动物、植物、真菌和其他具有由膜包裹着的复杂亚细胞结构的生物。 真核生物与原核生物的根本性区别是前者的细胞内有以核膜为边界的细胞核，因此以真核来命名这一类细胞。许多真核细胞中还含有其它细胞器，如线粒体、叶绿体、高尔基体等。