Archive for the ‘Science’ Category

Lego Bacteria

Wednesday, November 27th, 2013

lego-bacteria

When studying about bacteria in biology, one of my sons decided to build a Lego bacteria. He used two small base plates, which he connected with black Legos representing the cell wall. Green Legos projected out of the cell wall, representing the pili used for locomotion. The flagellum is made of green Legos, and it looks like a tail coming out of the back of the bacterium. The flagellum is also used for locomotion.

The ribosomes are red Legos, and they synthesize protein in the cell. The ribosomes are what powers the bacterium because they take the DNA and turn it into protein for the cell to use. The DNA is made out of blue Legos arranged in a squiggly pattern. Without DNA, the cell would die very quickly because the ribosomes would not be able to make any protein.

Many bacteria are harmful to humans, but other bacteria help humans. People who study bacteria help us to stay healthy, which is one reason why my son wants to be a microbiologist.

If you enjoyed making Lego bacteria, you will love the biology activities in the Unit Study Treasure Vault. If you are homeschooling, your whole family can enjoy biology through the videos and activity demonstrations in the biology section of the Vault!

You Can Order Live Amoebas!

Tuesday, November 26th, 2013

order-live-amoebas

You can order live amoebas! You ask, “Why on earth would I want to order live amoebas?” Well, if you are studying biology and you are not impressed by the dead amoeba specimen in the slide set, you will want to order a live amoeba so that you can actually see it move! You know, with its pseudopods squishing along.

Of course, I was reluctant when my son began begging me for live amoebas. After all, I grew up in a third-world country where I suffered from amoebas all the time. Let me tell you, they are everywhere: in the water, in the strawberries, in the ice cubes… Don’t drink the water from third-world countries. Just don’t.

But the sweet begging of my son and the fact that he had aced his biology exams at age 11 caused me to re-examine my reluctance. After talking it over with my husband, we decided to order them. My son screamed, “Yes!!” as if he had scored a goal.

We ordered our live amoebas from this company. I was disappointed by 2 things:

  1. It looks like they only cost $7, but they force you to do at least 2-day shipping (or the amoebas will die), so it’s more like $30. I would rather they had said, “This will cost you a total of $30, plus any medicine you will need to get rid of the sickness in your house.” (I’m just kidding about the sickness. None of us got sick.) But the amoebas cost $30. I still think they were worth ordering.
  2. When the flask arrived in the mail, my son jumped up and down like it was Christmas. At first we could not find ANY amoebas. They say there are enough amoebas for a classroom full of 30 kids, so I was expecting the amoebas to be easy to find. My son’s right eyeball was going blurry as he asked me to please look until my right eye went blurry. Then I called my husband to come home from work and look, and of course, my husband found one. Because he is my knight in shining armor, and he always saves the day in our homeschool.

live-amoebasMy son squealed with delight when we actually captured the moving amoeba with his microscopic camcorder he got for Christmas last year. He was excited to see the live amoebas moving around with their pseudopods, sloshing along. We filmed the amoebas with a micro-camera, and we will be uploading the video to the huge biology section of the Unit Study Treasure Vault. (You should join the Vault if you are studying biology, because there are lots of fun videos and printables of every topic covered in a typical high school biology textbook.)

Thankfully none of us got sick, and we disposed of the amoebas in a sealed container in the trash. Since amoebas need oxygen to survive, they pretty much die within a few days.

I must say that the live amoebas looked “gorgeous,” according to my son. They looked like they were full of Christmas lights, since they had lots of vacuoles for getting rid of excess water. The nucleus kept moving around, and the amoeba squished itself forward, right in front of our eyes. Amazing!

Amoeba Cake

Monday, November 25th, 2013

amoeba-cake

Amoeba cake?! You’ve got to be kidding me! That doesn’t sound very appetizing… But my son wants to be a microbiologist, so guess what kind of cake I made him for his birthday this year? You guessed it: Amoeba cake.

Before I explain how to decorate the cake, look at the cool invitation we made for his amoeba birthday party:

amoeba-invitation

How to Decorate an Amoeba Cake:

  1. Bake a rectangle cake. Make it whatever flavor you want.
  2. Cut a piece of cardboard larger than the cake and cover it with foil, taping down the edges underneath.
  3. Sprinkle flour on a cutting board. Grab the rectangle cake while it is still hot and up-end it onto the cutting board. With a knife, cut the rectangle into an amoeba shape.
  4. Pick up the cake and place it on the foiled cardboard. Put it in the refrigerator for an hour or two.
  5. Stir some blue food coloring into the white vanilla icing. Ice the cake.
  6. Grab some candy to represent the organelles, and decorate the Amoeba cake. We used a peppermint patty for the nucleus, round mints for the contractile vacuoles which pump water out of the cell, and M&M’s for the food vacuoles.
  7. We outlined the cake with chocolate frosting. You can do this cheaply by putting the frosting into a Ziplock bag, and snipping off the corner. Then squeeze the frosting out like toothpaste.

amoeba-boxYour Amoeba cake is now complete and ready to eat! Enjoy!

As a side note, my daughter made an amoeba box out of construction paper and tape, with an amoeba colored on the outside of the box. She created some bookmarks for her brother’s birthday and put them inside the box. Isn’t the box cute?

For hundreds of fun biology activities and videos, join the Unit Study Treasure Vault.

 

Sea Monkeys

Wednesday, November 13th, 2013

sea-monkeys

Last year for Christmas, I bought my son some sea monkeys. They apparently come in a sealed package as eggs that are dormant when dry. They come to life when you add water. It’s kind of frieky if you think about it, that a sealed package that sits in a store for years can have something that springs to life inside of it.

This reminds me of the bean seeds in King Tut’s tomb, which after thousands of years, sprouted into living plants. But to me, seeds of plants are different than animal eggs.

The package comes with a container and water purifier package (powder), which you just dump into the water and stir with a spoon. You wait 24 hours before putting the sea monkeys into the container. Don’t feed the sea monkeys for five days. After this time has passed, you add a pellet of food per day into the container. We never ran out of pellets that were included in the package. The sea monkeys grew to maturity and swam around.

Sea monkeys are brine shrimp, by the way, which are crustaceans. It’s fun to raise sea monkeys when you are studying underwater sea creatures.

We filmed our entire experience with these sea monkeys, from the time we opened the package, to when they sprang to life, to when they grew up, to when they mated and had eggs of their own that hatched. Yes, all of this was caught on film, ladies and gentlemen, and I edited the video to 3 minutes:

If you want to use my Amazon affiliate link to buy the exact same kit we did, here it is.