Most bacteria also need oxygen, which they can get from the air, like we do.
There are lots of different kinds of bacteria, and they all eat somewhat different things. Just like different animals all eat somewhat different things.
I hope this is
Sir or Madam
How can we teach kids of 10 years old what is the cell?
yours truly, Fahad
An age appropriate project might be as follows:
One of the central concepts about DNA is the fact that Adenine (A) always pairs with Thymine (T) and Cytosine (C) always pairs with Guanine (G). That is the key for faithful replication of the DNA strands. And, faithful replication is absolutely necessary for life to be passed down the generations.
Using 4 different colors of beads and 2 pipe cleaners, your son can construct a single strand of DNA and then make the matching 2nd strand. He would assign one color to represent each nucleotide. Then use the proper pairing to demonstrate how DNA is copied. He could make a 'U' shape at the end of the 'single strand' pipe cleaner to keep all of the beads on. (If the beads are matched with the cleaners the beads will slide smoothly by snuggly) This first strand can be completely random in color of beads. And, remember to use all 4 colors on the one pipe cleaner. I would suggest twisting one end of each of the two pipe cleaners to keep them together, and build the second strand according to the proper pairing strategy. Once the second strand is completed, he can twist the ends of the two pipe cleaners again to 'seal' that end. Also, he can make a gentle twist - creating the 'double helix'.
He might want to take pictures of the pairs and the progress of making the second strand. And, he could have plastic glasses (4) filled with the beads, pipe cleaners, and constructed single strands (randomly beaded pipe cleaners). He could demonstrate the process and have extras for the judges and visitors to have a go at it, as well.
Good luck to him. The bottom line is to have fun.
Dear Dr. Pat,
The question is, Why DNA polymerases did not evolve to be primer independent
as RNA polymerase? If you provide me the answer, I would be very
obliged to you.
Good morning Roy,
My 'guess' would be that the RNA synthesis does not need the double helix to
unwind. On the other hand, DNA synthesis, of course, does. And
the DNA is so large, the job is split into smaller pieces. This is
where the primers come in... starting the small pieces so that eventually
they can be linked together to create the whole chromosome.
Dear Dr. Pat,
anonymous concerned person
When the microscope was invented and folks began to see cells for the
first time -- it reminded them of the very small quarters in which monks
lived. These were called cells and the biological term was named
after these rooms.
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