enzyme --- 重要bio concept 中四

Q: enzyme 是不是 living things A: No

they are non living

they are just proteins in a plex stucture Q:it catalysts reaction

then why doesn't it require energy A: Enzyme do catalyst a reaction

It does not requires energy at all

because the definition of a catalyst (enzyme in this case) is a reagent that provides a reaction pathway that requires less activation energy than a normal reaction would need In an reaction

not all of the molecule can react with each other

ONLY the ones have more than ENOUGHT energy can undergo a reaction Lets assume that minimum energy reuired to let the reaction happened is X If a correct enzyme es in

the energy require to let the reaction happened is less than X Therefore

more product is form In other words

enzyme do not speed up the reaction by providing energy

instead

they let more molecules react Q:enzyme 在high pH value 和 low temperature 的condition 下

会不会denature or just inactive A: pH value ph value represents the amount of H+ or OH- ions that the enzyme is exposed to Under Extremes of ph

H+ or OH- will react will react with the enzyme

and DENATURE the enzyme Low temperature: Again

I repeat my point

only molecule have more than enough energy can react

if the reactant are experiencing COLD environment

that implies they have less energy to react But low temperature can only make the enzyme INACTIVE But under HIGH ph

and LOW temperature

the enzyme will denature

since the denaturation is cause by high pH and it is INREVESIBLE Q: Carbohydrates catalysts the breaking down of carbohydrates then without them

can carbohydrates be broken down into monosacchurides If yes

then what is the cause of the reaction A: Carbohydrates will break down into monosaccharides without the presence of carbohydrate And the main cause of the reaction of reaction is again

whether the molecule has sufficient energy to react or not If they have more than enough

they will react With the presence of the enzyme the process would normally only take few hours

BUT WITHOUT the presence of enzyme

it would take years Hope it is not too long for you to read It is very interesting concept to understand (in person)

参考: Biology text books

and my knowledge

enzyme 是不是 living things enzyme is a protein MOLECULE

do u think a molecule can possibly be living the allest living ani at least have a plete CELL it catalysts reaction

then why doesn't it require energy energy is provided by the surroundings

ie temperature/heat u see

it's why enzymatic activities depends on the temperature enzyme 在high pH value 和 low temperature 的condition 下

会不会denature or just inactive pH: either too high or too low would cause denaturation temperature: too low inactivate

too high denature Carbohydrases catalysts the breaking down of carbohydrates then without them

can carbohydrates be broken down into monosacchurides If yes

then what is the cause of the reaction yes

but in very high temperature with suitable chemicals

eg strong acid u dun have to learn what acid is it for f4

or even for alevel i think

for the sake of exams wat is activation energy is it in the syllabus of HKCEE it's briefly mentioned in chem

but not bio if u study chem too

try to related it to bio activation energy is the energy needed for a reaction to -start- if the reaction is exothermic

the energy given out by the reaction will continute to provide energy for the reaction to go on

if it's endothermic

then u have to give continuous engery input in order to maintain the energy level to at least the activation energy to go on for enzymatic reaction

just as any catalysts(in chem)

the activation energy will be lowered

so less enery is needed to start the reation for the same level of engery

the reaction can occur at the higher rate at this stage

energy level refers(directly proportaional) to temperature my is within the scope of ce syllabus

参考: ce and AL bio + chem

Enzyme is not a living things because it does not have the characteristics of living ani s It is only a kind of protein with a particular structure Enzyme does not require energy but the metabolic reaction requires energy Enzyme just serves to lower the activation energy At extreme pH out of the optimum pH

it will denature and the reaction bees irreversible It loses its catalytic properties At low temperature

it just bees inactive since the kiic energy of the enzyme molecule is low It will bee active again when temperature rises Without carbohydrases

carbohydrates can still be broken down into monosacchurides The reaction is just much slower and more energy is needed to carry out the reaction

emzyme is a biological catalysts which speed up chemical recation But for is it a living thing

I am not so sure with it At extreme pH

denature At low temperature

inactive I am sorry that I can't wer all your question

参考: me

No It provides suitable condition only it depends can 最后不懂sorry

按照端口号的大小分类，可分为如下几类 ：

（1）公认端口（WellKnownPorts）：从0到1023，它们紧密绑定（binding）于一些服务。通常这些端口的通讯明确表明了某种服务的协议。例如：80端口实际上总是>

（2）注册端口（RegisteredPorts）：从1024到49151。它们松散地绑定于一些服务。也就是说有许多服务绑定于这些端口，这些端口同样用于许多其它目的。例如：许多系统处理动态端口从1024左右开始。

（3）动态和/或私有端口（Dynamicand/orPrivatePorts）：从49152到65535。理论上，不应为服务分配这些端口。实际上，机器通常从1024起分配动态端口。但也有例外：SUN的RPC端口从32768开始。

扩展资料

各种服务常用端口号：

1，>

2，SOCKS代理协议服务器常用端口号：1080

3，FTP（文件传输）协议代理服务器常用端口号：21

4，Telnet（远程登录）协议代理服务器常用端口号：23

5，>

6，>

7，Telnet（不安全的文本传送），默认端口号为23/tcp（木马Tiny Telnet Server所开放的端口）

8，FTP，默认的端口号为21/tcp（木马Doly Trojan、Fore、Invisible FTP、WebEx、WinCrash和Blade Runner所开放的端口）

9，TFTP（Trivial File Transfer Protocol），默认端口号为69/udp

10，SSH（安全登录）、SCP（文件传输）、端口号重定向，默认的端口号为22/tcp

11，SMTP Simple Mail Transfer Protocol（E-mail），默认端口号为25/tcp（木马Antigen、Email Password Sender、Haebu Coceda、Shtrilitz Stealth、WinPC、WinSpy都开放这个端口）

12，POP3 Post Office Protocol（E-mail），默认端口号为110/tcp

13，Webshpere应用程序，默认端口号为9080

14，webshpere管理工具，默认端口号9090

15，JBOSS，默认端口号为8080

16，TOMCAT，默认端口号为8080

17，WIN2003远程登录，默认端口号为3389

18，Symantec AV/Filter for MSE,默认端口号为 8081

19，Oracle 数据库，默认的端口号为1521

20，ORACLE EMCTL，默认的端口号为1158

21，Oracle XDB（XML 数据库），默认的端口号为8080

22，Oracle XDB FTP服务，默认的端口号为2100

23，MS SQLSERVER数据库server，默认的端口号为1433/tcp 1433/udp

24，MS SQLSERVER数据库monitor，默认的端口号为1434/tcp 1434/udp

博凌科为生物科技-为你解答：Luminex与CBA的比较Luminex和CBA是两种最近几年来比较热门的检测细胞因子的技术，两者之间的大致区别： CBA: 可在流式细胞仪检测。 可同时检测一个标本中的6－8种细胞因子 可检测50ml的标本（上清液） 检测范围：0-5000 pg/ml Luminex: 只能运行在Luminex机器上(or Bioplex from Biorad) 可检测20-22种细胞因子 可检测25-50 ml的标本 检测范围：0-1667pg/ml

首先保证两台计算机能够ping 通，并知道两台计算机IP地址

如A机器： 192168010  (装有oracle数据库）

  B机器： 192168011

在B机器上安装oracle客户端（client）软件

配置tnsnamesora文件（该文件在客户端安装位置的network/admin下，如：D:\oracle\product\1120\client_1\network\admin）

tnsnameora文件配置大致如下：

ORCL =

(DESCRIPTION =

  (ADDRESS_LIST =

    (ADDRESS = (PROTOCOL = TCP)(HOST = 192168010)(PORT = 1521))

  )

  (CONNECT_DATA =

    (SERVICE_NAME = orcl)

  )

)

其中hostname 是数据库服务器IP地址，service_name是数据库服务名（一般情况下与数据库名一致）

在B机器上命令行通过sqlplus scott/tiger@orcl 来连接数据库

先说说对不起

小弟的英文不好

有不好之地方

请大家原谅 Nucleus:Do you mean the cell's nucleusIf yes

all right

here it is: In cell biology

the nucleus (pl nuclei; from Latin nucleus or nuculeus

"little nut" or kernel) is a membrane-enclosed anelle found in all eukaryotic cells It contains most of the cell's geic material

anized as multiple long linear DNA molecules in plex with a large variety of proteins

such as histones

to form chromosomes The genes within these chromosomes are the cell's nuclear genome The function of the nucleus is to maintain the integrity of these genes and to control the activities of the cell by regulating gene expression The main structures making up the nucleus are the nuclear envelope

a double membrane that encloses the entire anelle and separates its contents from the cellular cytopla

and the nuclear lamina

a meshwork within the nucleus that adds mechanical support

much like the cytoskeleton supports the cell as a whole Because the nuclear membrane is impermeable to most molecules

nuclear pores are required to allow movement of molecules across the envelope These pores cross both of the membranes

providing a channel that allows free movement of all molecules and ions The movement of larger molecules such as proteins is carefully controlled

and requires active trport regulated by carrier proteins Nuclear trport is crucial to cell function

as movement through the pores is required for both gene expression and chromosomal maintenance

Cell membrane and Cytopla i am going to give their wer to you in a minate later! 2008-10-15 16:54:42 补充： cytopla : The cytopla is the contents of a cell that is enclosed within the pla a membrane The cytosol is a plex mixture of cytoskeleton filaments

dissolved molecules

and water that fills much of the volume of a cell The cytosol is a gel

with a neork of fibers dispersed through water 2008-10-15 16:55:13 补充： cytopla 2: The part of the cytopla that is not held within anelles is called the cytosol The cytosol is a plex mixture of cytoskeleton filaments

dissolved molecules

and water that fills much of the volume of a cell The cytosol is a gel

with a neork of fibers dispersed through water 2008-10-15 16:57:11 补充： cell membrane: The cell membrane (also called the pla a membrane

pla alemma

or "phospholipid bilayer") is a selectively permeable lipid bilayer found in all cells 2008-10-15 16:57:28 补充： cell membrane2: The pla a membrane also serves as the attachment point for both the intracellular cytoskeleton and

if present

the extracellular cell wall 2008-10-15 16:59:53 补充： picture: uploadwikimedia/ /mons/3/3a/Cell_membrane_detailed_diagram_4svg

Nucleus -control the activitier of cell -contain chromosomes -made up of DNA -inheritance(遗传) Cell wall -made up of cellulose -free permeable -hard--->protect and support the cell -large spaces beeen the cellulose fibres----->allow laege particles to perate(free permeable) Cell membrane -consist of protein snd lipid -control the movement of material in or out of the cell -control cell membrane is selectively permeable Cytopla -clear

jelly like -consist of an aquesous solution of many substances(protein) -provide a medium for chemical reactions to take place -contain a lot of anelles and granules Chloroplasts -absorb sunlight for photosyntheis Mitochondria -respiration takes place---->release energy -also called"power house" Vacuole -also called"cell sap" -large at the centre -contains a solution of sugars

protein and minerals -provides support when it is fully filled with water Non-living granules -contain crystals of insoluble waste -starch granules This all are found in plant cells

there are 8

参考: 好努力自己打出黎架

Nucleus: -Nucleus controls all cellular activities -Contains chromosomes which carry gentic informations Cell Wall: -Supports and gives shape to cells Cell membrane: -Encloses the cytopla -To control the movement of materials into and out of cells Cytopla : -Provide a place for chemical reactions to take place inside the cell -Contains anelles All of them can be found in plant cells!

参考: myself

just finish the quiz tdyXD

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