Archivo de la categoría: biology

Enzymes end of chapter questions

End of chapter questions

1)

A.The enzymes are catalyst proteins that make metabolic reactions very fast inside our bodies.

B.An enzyme can be denatured if they reach a very high or low temperature like more than 40°C or less than 1°C or have a low or high pH.

C.In an enzyme-controlled reaction, the substance which is present at the beginning of the reaction is called substrate.

D.In a metabolic reaction the substance which by the reaction is the product.

E.The active site is where the metabolic reactions take place.

2)

A.The optimum temperature for the activity of the protease enzyme is 37°C.

B.The optimum pH would be of 1.

C.They work slower because they have less kinetic energy so they move slower.

D.The rate of reaction slows down above the enzyme optimum temperature because of the lost of shape, they can’t fit with the substrate.

    4)

    1.Sucrose perfectly fits with the sucrase enzyme. An anabolic reactions occurs in which sucrose is broken down into glucose and fructose.

    2.

    A.Because at 40°C enzymes work at their best

    B.As the pH goes up to 7, the enzyme rate of work increases, reaching the optimum point. After 8, it starts to go down.

    I worked with Azul Sequeira

    Project polysaccarides

    In biology, we did a project work on the chemicals of life. Our group, Juan Pablo Uva, Fermín Serra Vazquez and me, got polysaccharides.

    This is the link to our teacher’s blog: http://cadem.cumbresblogs.com/2018/04/17/term-1-project-biomolecules/

    This is our presentation:

    This is our model:

    We think that to make it better next time, we need to get together at least once and give more importance to the model.

    Project on Darwin

    The project for our last term was about Darwin. Here is the link to the task

     

    DARWIN AND RELIGION

    Intolerance

    1- He disagrees with some of Darwin’s points in the book On the origin of species because he can’t be convinced that apes are human ancestors.

    2-  They are friends and trust each other, they respect each other’s beliefs.


    3- He embraced Darwin’s theory about all being coming from one common descendant but had difficulty agreeing with how far Darwin had taken it

    4-  She fears they would have different opinions on religion and that is why she asks him to read an extract from the bible, she probably doesn’t want him to talk to her about it because she is afraid of what he may think.

    2- We believe now there is a lot more tolerance than there was in Darwin’s times, because before people were a lot more strict when it came to religion, and whoever questioned it was bad. Now people are more free to express their ideas without being judged.

    3-  Once, I had a discussion with a very religious friend about how I didn’t believe in god, he kept insisting that I was wrong because I had a different opinion. The conflict was solved by talking to him calmly and explaining how having a different point of view and different beliefs doesn’t mean someone is wrong.

    4- We believe an issue that causes conflict in society is terrorism, many people do this kind of horrific acts because they believe they are beneficial in some way, terrorism is generally related to religion. But in the other side, the people who suffer from terrorist attacks are mostly innocent and don’t deserve to be hurt or die because of someone else’s belief.

     

    5- We believe a possible solution for terrorism is educating the people for them to understand that that kind of acts are wrong and not beneficial for anyone, not even for themselves.

     

    6- Tolerance is a crucial concept for people to live in harmony, we need to understand that if someone else has a different belief or opinion, it doesn’t mean its wrong or that person is an “enemy”. Tolerance is also a way of reducing terrorism.

     

    What does Darwin believe? 

     

    1-Letter questions

     

    1.  Darwin is not able to believe in an existing God, because he cannot see how a “beneficent and omnipotent” God would create Ichneumonidae, which are a family of parasitic wasps. This means that they feed on other animal’s bodies. He cannot understand how a good being would create such a bad thing, which is what many of us keep wondering to date.
    2. Darwin says this because he believes that his word is not stronger that religion. Religion was a very important thing in those times, and the idea of God not existing was radical.
    3. The letters clearly show how difficult it was for Darwin to believe in God. He wants to, but he is not able to. He cannot understand how a God, for example, would create bugs who´s lives are based on consuming other living organisms lives, or how a lighting, by natural laws, would kill a man, whether good or bad.. Charles believes that the amount of suffering the world and humanity go through has to be the result of a natural sequence of events, and not the willing of God.

     

    2-Reasons why we might or not support the idea of God existing when there is so much misery in the world.

     

    In favour Against
    • The existence of terrifying and bad things, such as, in Darwin’s words, Ichneumonidae.
    • The death of the good.
    • Illnesses and other causes of massive death.
    • The existence of bad in people created, according to the bible, to God’s (a benevolent being) image.
    • All the bad things are created by Satan.
    • We need death for the natural cycle to continue as it has
    • Every single organism is needed for nature
    • God gives us the possibility of choosing for ourselves, we choose to be bad

     

    3-MiniInterview

     

    Us: Do you believe in God besides your theory?

    Darwin: No, I don’t, the idea that a beneficent God created this world bewilders me.

    Us: Why do you deny the existence of God?

    Darwin: I can’t see how a benevolent being would be the beginning of such and not benevolent world.

    Us: Then, how do you think the world begun?

    Darwin: I think we all come from the same, most simple organism. I still have a lot to think about this theory, so I am not yet able to give you a useful answer.

    Lab experiment: Growing Bacteria

    August 23rd

    Describe what we did last class (Wednesday) and the results today

    You may add drawings or photos to be clearer

     

    Last class we preapered flavourless jelly without cooling it to make it solid. Then, we decided that we wanted to watch bacteria reproduction, and as flavourless jelly is transparent and of an interesting solidity it was a nice thing to test it on.

    To do this we had to choose between coughing on our hands, or touching dirty things such as the floor. We chose to cough and then we put our finger on the non-solid-yet jelly. All this we did on a petri dish which are used to grow bacteria.

    Today, after 1 week we went to the lab to see the result of our bacteria growth. Our dish isn’t so dirty, so we can guess that one week ago our mouth was quite clean from bacteria. Instead, the people that chose to touch the floor got more disgusting results. Here is ours:

     

    Seed germination- Biology project

    1. On July the 5th, we prepared a flask with soaked lentils, cotton and blotting paper to make the seeds germinate. In my case, as I didn’t had a flask that day, I started the project by myself on Mar Del Sur the 22nd of July.

    We worked in pairs, in my case, with Lucas Alonso Breuer studying variables (temperature, water, sunlight and oxygen).

    The variable we studied was with sunlight, so Lucas protected his flask from sunlight, but he made a mistake and give it artificial light, which we later found out that also helps for photosynthesis. Also we couldn’t compare perfectly our results as I by mistake put in another temperature than him, more info below (;.

    Besides of starting a couple of weeks later, I actually had more difficulties than that one. In MDS, the temperature was very cold, which I did most definitely not expect, so I didn’t know when to water it or were to leave it. After fighting for 3 days with the seeds, the 4th day they germinated.Pitifully, they died on day 7 because of the cold (I suppose). After seeing this, I accidentally dropped the flask and couldn’t take a proper picture

    Asexual and sexual reproduction

    Reproduction

    Reproduction is one of the fundamental characteristics of all living things. Each kind of organism, has a certain way to reproduce but all of the methods are divided in sexual reproduction and asexual reproduction. In reproduction, each organism gets a set of chromosomes from their parents. Chromosomes are a set of DNA which is in contained in the nucleus, and contains a set of instructions called genes.

    Asexual Reproduction

    • Just one parent
    • A cell divides and creates two new cells
    • As it is one parent, the genes keep the same, producing the new cells to look exactly the same to their parents

    Example: Potato reproduction

    Potatoes reproduce by using stem tubers. Some tubers grow above the surface and grow leaves, which photosynthesizes. Others, grow underground, and swelling form on them. This swellings are provided with sucrose which comes from the leaves. Then, the sucrose is converted to starch and stored, creating potatoes. This is why they are a great source of starch. Also, each plant can produce many stem tubers.

    Sexual Reproduction

    In sexual reproduction, the parents organisms produce sex cells called gametes, an example of this are sperm (male gamete) and eggs (female gamete). When this two gametes join and their nuclei fuse, it is called fertilisation. When this happens, a new cell is created, called zygote. The zygote divides repeatedly and ends up creating an organism which has chromosomes and genes from both parents.

    Gametes are not like every cell. Gametes contain only half as many chromosomes as normal cells, so when gametes fuse, the zygote will have the normal amount of chromosomes (46)

     

    Classification

    Today we worked with quizlet to learn about classification, and prove ourselfs

    https://quizlet.com/subject/Classification/

    Words (biological meaning) now I know the meaning of:

     

    Domain: Higher biological rank

    http://www.biology-online.org/

    Then I did an IGCSE test on quizlet

    https://quizlet.com/102276024/igcse-biology-classification-chapter-1-flash-cards/

    I got a 75%!

    Then I did a gravity game!

    https://quizlet.com/102276024/gravity

     

    Biology Test with Bautista Bravo

    Name:………………………………….

     

    Date:…../……./…….

    Colegio Las Cumbres

    Biology test

    For senior 1

     

    Hi guys! Before you start the test, I recommend you to  read all the instructions and questions. Wish you luck!

     

    1. What are we made of?

    ……………………………………………………………………………………………………………………………………………………………………………………………………

    2)  Label this cell

    Resultado de imagen para label this cell

    3) What type of cells do human beings have?

    ………………………………………………………………………………………………………………………………………………………….………………………………………..

    4) Do cells reproduce?

    ………………………………………………………………………………………………………………………………………………………….………………………………………..

    5) Do cells have a gender?

    ………………………………

    6) Draw a animal cell

     

    7) Are cells alive? Yes/No

     

    8)Elaborate what you know about cells

    …………………………………………………………………………………………………………………………………………………………………………………………………………….

    9) What’s the function of the cell membrane?

    ……………………………………………………………………………………………………….

    10) Order from smaller to big. Organell-Cells-Tissue-Organ system-Organism