Question

write true or false on the lines below each sentence. if the sentence is false, rewrite it to make it true.

1. dna molecules are smaller than most other molecules found in cells.
2. watson and crick described the structure of a dna molecule.
3. a dna molecule contains a code that controls the activities of a cell.
4. the vacuole in a cell contains dna.
5. thousands of cells make up a dna molecule.
6. a dna molecule has the shape of a ball.

critical thinking
make a list of at least ten human characteristics that you think are controlled completely or partly by a persons dna. name two characteristics that you think are not controlled by dna. write your lists on a separate sheet of paper.

Explanation:

1. DNA molecules are actually very large. They are made up of many nucleotides and are among the largest molecules in cells.
2. Watson and Crick are well - known for their discovery of the double - helix structure of DNA in 1953.
3. DNA contains genes which code for proteins. These proteins control various cellular activities such as metabolism, growth, and reproduction.
4. In eukaryotic cells, DNA is mainly located in the nucleus (in the form of chromosomes). Some DNA is also in mitochondria and chloroplasts (in plant cells). Vacuoles are storage organelles and do not contain DNA.
5. DNA is a molecule, and cells are made up of many molecules including DNA. The reverse is not true.
6. DNA has a double - helix structure, not a spherical (ball - like) shape.

Answer:

1. False. DNA molecules are larger than most other molecules found in cells.
2. True.
3. True.
4. False. The nucleus (and in some cases mitochondria and chloroplasts) in a cell contains DNA.
5. False. A DNA molecule is a part of a cell (or a virus in some cases), and cells are made up of many molecules including DNA.
6. False. A DNA molecule has the shape of a double - helix.