Muddiest Point

Hey everyone. :)
I was looking at the study guide and I'm not sure what is meant by lung capacity. What is it and how is it measured? Also, what is systolic and diastolic pressure?
Thanks!
-Tanya P.

Muddiest Point

how does the fruit function in a plant?

Scribe 3/8/12

Hey Everybody!

The first thing we did today was the plant of the day. Today's plant was a moss ball (which is actually made of algae).

Mrs. Stein then stamped our homework that was due. (UP 67-68)

We then got started on our plant pigments lab. It was based on what kind of pigments are found in different plants. We looked at a spinach leaf and a red leaf. We determined the different pigments in the plant by first transferring the green/red from each plant onto a drawn line on this paper called chromatography paper. We then rolled up the paper and put the bottom portion of it into alcohol. We waited about 10-15 min. Once the time was up, we saw how the different colored pigments separated on the paper. This is what our results looked like once the pigments were separated:

We also took some notes on photosynthesis. The main things you have to know are:

• (reactants) 6CO2 + 6H2O = (products) C6H12O6 + 6O2
• Photosynthesis takes place in the chloroplast!!

You have to know this picture!!!

The HW for tomorrow is :

• UP 81-85 OR Cornell notes
• Finish Pigments Lab
• National Parks Research

KELLI will be our next scribe!

Muddiest Point

I was looking at the objectives and i didn't really understand what the ecological, economic, and humanistic importance of invertebrates and vertebrates means. Also, in class today, I didn't understand what the body cavity was.

Thanks.

-Tanya

Muddiest Point

I'm having trouble understanding what relative and absolute dating is. Also what is a genetic drift?

-Thanks!

Muddiest Point

Hey! I don't understand what the feedback mechanism is and what positive and negative feedback is. Can somebody please help me?

-Thanks, Tanya P

Muddies Point.

This is a question from UP page 44. Its about the blood types and one of the questions said that the person had type A blood. How do you know if the person has IaIa or Iai blood? Because they don't specify if the blood is hybrid or not....

And also on page 52 in UP I was confused on a question. Its about Huntington's disease and I know that it is a dominant allele. The question said that one of the parents was affected but I was confused on how you knew if the person had Hh or HH? The answer showed that it was Hh but how did you figure that out?

Please help me figure this out!! :)

Cri-Du-Chat

Cri-du-chat syndrome is caused by a deletion of a part of chromosome 5. Because of this deletion, many of the genes are nonexistent in the affected person. This deletion happens because of a break in the DNA molecule during the creation of the egg or sperm. It could be, but not always is, inherited from a parent. The symptoms of cri-du-chat is having a cat-like cry as a baby, Also the affected person has distinctive facial features like a small, unusually round head. They also have many health problems such as respiratory problems, severe mental retardation, and heart defects. Doctors can detect this syndrome by an infants cat-like cry or by some of their health problems. Doctors can also detect it when the baby is still in the mothers womb. Sadly, there are no treatments for cri-du-chat, but the child can go through therapy so that they develop as normally as possible. It is also the most common syndrome that comes from a chromosomal deletion, and about 1 in 50,000 babies are affected. The life expectancy is normal if the person has no major organ defects or critical medical conditions.

Info from: http://learn.genetics.utah.edu/content/disorders/whataregd/cdc/index.html

Review of Class: Nov. 28

In class today we took notes and learned about meiosis cell division. All of the notes from class are up on moodle. To briefly summarize, meiosis is the division of haploid cells. Haploid cells are the cells that contain half of the original amount of chromosomes, which is 23 chromosomes in humans. Another important fact about meiosis is that it only happens in reproductive cells, which are the sperm and egg cells. The video below sums up the process of meiosis:

I hope this video helped your understanding of meiosis. If not, then here are some links of more detailed videos of the stages of meiosis and sexual reproduction:

• Mitosis, Meiosis, and Sexual Reproduction: http://www.khanacademy.org/video/mitosis--meiosis-and-sexual-reproduction?playlist=Biology
• Phases of Meiosis: http://www.khanacademy.org/video/phases-of-meiosis?playlist=Biology
• Difference between mitosis and meiosis: http://www.youtube.com/watch?v=Ba9LXKH2ztU&feature=results_main&playnext=1&list=PLC7DDC2846B1BF913

Hopefully these three links will help you understand meiosis even better. Personally, I recommend the first two videos because, they were very helpful in my understanding of meiosis, and also the various definitions like zygote and homologous.

HW for today:

~11.4 flow map "Stages of Meiosis" OR double bubble map "Meiosis vs. Mitosis"

~UP 13-14 read/color/annotate

Guess Who The Next Scribe Is...........SONYA!!!!!!!! :]

Muddiest Point

Hey guys I need some explaining and verification about the B cells and the T cells.

• What exactly are antigens and antibodies?
• Please explain to me the whole process before the helper T cell comes in.
• Does the helper T cell turn into a killer T cell after it is activated by the macrophage? And what exactly do the helper T cells do?
• Does the B cell process have anything to do with the T cell process?
• When the antibodies are flagging a cell for destruction are they technically calling the macrophages to come and destroy the cell? So then the macrophages kill the cell and presents it to the T cells so they could attack too.....?

I know this is a lot but i would really appreciate it if someone helped me. :)

Muddiest Point

Hey Guys!

I don't understand the difference between chromosomes and chromatin. Can someone explain it to me?

Muddiest Point

Hey guys! I need some help understanding some things in section 6.3. The first thing that got me confused was biodiversity. I don't understand what biodiversity actually is. One paragraph said that it was a type of natural resource....what??? Another thing that was confusing to understand was genetic diversity. I didn't understand the definition that was in the book, it made no sense to me. The more I kept reading about biodiversity and genetic diversity, the more it confused me. If someone understands, please please please help me! :)

Review of class: 9-13

Today in biology we did various things. Because of an assembly, though, the class was shortened. The class started off with Mrs. Stein telling us in what rows we are going to be sitting in the auditorium, so that we are not confused about it when we get there.

Next, we silently read through the Duckweed Lab rubric once, so that we could get an idea of what we are being graded on. Mrs. Stein then explained everything on the rubric. She showed us three concepts that we need to research for the duckweed lab. These concepts are:

• Find out more about duckweed!
• Find out more about your independent variable!
• Why is it important to study populations?

These concepts are also posted on Moodle under Duckweed Lab Research Guide.

We then further talked about the last concept, why it's important to study populations. This is the part of the lab where you have to research about certain populations that are currently a problem. Some examples of these problems are: Endangered species, Invasive species, and the rapidly growing human population.

After talking about our lab, we walked down to the IMC. When we got there, we had a discussion about certain sites that are helpful to use in our research. These sites can be found under LibGuides on the GBS homepage. (or take the easy way: http://gbslibguides.glenbrook225.org/scidatabases ) ^_^

The rest of the class we had time to start on our research. Then class ended and we went to the assembly.

The next scribe will be.....ALI :)