BW has been working through the parts of a plant cell on his own. After learning the parts of the prokaryotic and animal cells, he has been asked to process this on his own. It has been a difficult thing. He wanted it given to him. He wasn’t keen on sorting through information that may or may not be relevant or even locating the information in book form. But we are nearly done. I can’t wait to hear his presentation.
Category Archives: Biology
We’ve had wonderful discussions about DNA replication.
The blue mat represents the cell. The white woven mat represents the nucleolus. The nuclear membrane is represented by the pink and blue finger chains. The ribosome is the maroon double blob.
Yesterday we extracted our DNA in a multi-step plan.
BW has completed the Clock of Eras and the Claremont timeline. Often BW has so many ideas that he needs a transitional time to let his ideas settle and deeper concepts to emerge. Giving him the space he needs is critical to his understanding lessons. The space has been created by the Claremont lessons – prokaryotic and eukaryotic cells, the process of DNA replication, and anaerobic and aerobic respiration.
BW discovered some fossils in one of our rocks that serve as weight to hold down large unruly poster papers. He spent a few moments at the beginning grouping the rocks by their type – igneous, metamorphic, and sedimentary. I also pulled down a fern to hold the spot where plants begin their march.
He sorted out the tickets by titles, invertebrates, fish, reptiles, amphibians, mammals, and what the earth was doing (like ice ages). He was very methodical and careful to place the items exactly where they belonged. It was such a pleasure to watch his care and attention for more than 45 minutes.
We have been looking at DNA replication – mRNA, rRNA, Ribosomes, Amino Acids. This is an interesting take on one DNA researcher.
After spending some time studying eukaryotic cells and the simple creatures made from them, we’ve moved on to prokaryotic cells. We’ve created from objects in my house the parts of the cell.
This colander was used for the nucleus because it had holes to represent the pores that the mRNA pass through. The tan yarn is the DNA and barely visible is the dish strainer that represents the nucleolus.
The cell: Endoplasmic Reticulum is the red tulle that is sewn to create the pocketed shape. Some of the green ribosomes can fit into the pockets while other are floating through the cytoplasm (the white rug). The mitochondria are the silver tart containers. The lysosomes (empty) are the silver marbles or larger glass marbles (full). The Golgi body is constructed from golden ribbon that is stitched to create the undulating shape. The lysosomes can fit into the loops to represent the packaging and release of items the cell is making or breaking down. The purple yarn represents the cell membrane. We chose to use two wraps of the yarn to represents the double layer of lipids that make up most of the cell membrane.
We created “Who Am I” game cards for each part of the cell.
On a lark we decided to head down to the Biology Department at the College of Charleston. On Mondays they have a noon lecture. The W’s were in; so the whole gang went. The kids were disappointed that the cushy chairs were not in this lecture hall. It’s the little things, you know.
The best part of the lecture was the understanding the process that scientists go through when undertaking a project. She showed how she went through each step.
Dr. Susan Peters from the University of NC at Charlotte was the lecturer. Her speciality is morphology. She has studied frogs for 15 years. As a morphologist, she asks these types of questions:
- How do structures function in animals?
- Does that function affect fitness?
- Which properties may be most important to enhance function and fitness?
- Where does the structure arise from? Is it a positive grand mutation or is it modification that is replicated?
- Hopping and swimming behavior – kinematics
- Structure and function – fiber/muscle types
- Forelimb dimorphia – which muscles are different in males and females and why?
A bit of country wisdom: Bullfrogs are territorial creatures and during mating season they defend their territory in a sort of sumo wrestling way. They also call for females in the evenings and nights during mating season. Most country kids who live near a pond can tell you that frogs have no idea what they are hopping on in the dark. You can get a frog to jump on your hand thinking that your hand is a female. They can hold that position for several hours. But why would you let them? It is just funny to gross out your mom.
- territorial defense (grappling)
- propping themselves up
- minor use in hopping
- Proportionately larger (really bigger)
- Conflicting data on the type of muscle fiber making up the FCR. This is very important because there are three main types of muscle and certain ones “oxidize” quicker and thus the muscle won’t fatigue as easily.
- Larger glycogen stores
- More mitochondria
- More fat
- Muscle 1 bring in the elbow and wrist into the embrace
- Muscle 2 also works in tandem with muscle 1
- Helps rotate the wrist to aid in control of the female body.
Two weeks ago a couple of the kids decided to delve further into bacteria by growing some. They built a Winogradsky Column.
Halfway into the beginnings of the bacteria growth. There is a distinctive green tint to the algae growing in the bottle.
I think we might need to gently wash it off.
Here is a great site for information and resources.