2. Fill in the blanks: a The twisted ladder structure of DNA is called
b- The base A binds to the base and the base G binds to the base
is a small segment of a DNA molecule that contains information
needed for building proteins.
d. There are different building block molecules that can be arranged in
different sequences of proteins.
3- Describe how DNA replicates.
4- Define static electricity and current electricity,
5- Fill in the blanks:
- Negative charges and
repel.
b- Negative charges and
attract
c An atom that loses an electron becomes
charged
d- In an atom,
are positively charged, while
are negatively charged.