CSA #5 - Chapter 13 DNA & 14 RNA

Front

If 35% of an organism’s DNA is thymine, what is the percentage of guanine?

Back

15%

Front

Chargaff rules of base pairing are explained by which structural feature of DNA?

Back

DNA is double stranded, and hydrogen bonds between base pairs hold the two strands together.

Front

What makes up the rungs of the twisted ladder?

Back

paired nitrogenous bases

Front

How does the double-helical structure of DNA explain how the molecules can be copied or replicated?

Back

Because of base pairing, each strand has all the information to serve as a template for the synthesis of the other strand.

Front

Which statement about DNA correctly explains this pattern?

Back

DNA replication occurs only during the S phase of the cell cycle.

Front

Where are the two original radioactive strands of DNA after replication in a non-radioactive medium?

Back

Both strands are intact, and both are part of a different molecule of DNA.

Front

Which event occurs in DNA replication in prokaryotes?

Back

Replication starts from a single point and proceeds in two directions until the entire chromosomes are copied.

Front

During DNA replication, what is the role of enzymes called telomerases?

Back

preventing loss or damage of genes near telomeres

Front

When must DNA replication occur during the cell cycle for each daughter cell to receive a complete copy of DNA?

Back

DNA replication must occur before mitosis.

Front

What would happen if a cell divides before DNA replication is completed?

Back

Daughter cells would receive incomplete genetic information and never regain it, and they may not survive.