Chapter 5 Quiz Answers - Cell Biology I Lecture

Each chromosome of DNA contains which of the following:

Several replication origins, one centromere, and two telomeres

Where is heterochromatin present?

In interphase chromosomes

Which of the following molecules has a positevely charged exterior that allows for DNA binding?

Histone proteins

Cytosine and guanine create _______ hydrogen bonds; whereas adenine and thymine create ________ hydrogen bonds which builds the double helix structure.

Three; two

Complete the sentence. Not all transcribed mRNA restuls in

Translated protein

Which of the following statements about the interphase chromosome and mitotic chromosmes is FALSE?

All of the statements are false.

Both are present at the same time inside the cell

• interphase chromosomes are present in interphase and mitotic chromosomes are present in the mitotic phase

Both have euchromatin and heterochromatin

• Only interphase chromosomes

Both are present during cell replication and division

• Only mitotic chromosomes

Both have spindle fibers attached to them ready for separation

• only mitotic chromosomes

The methylation, acetylation, and phosphorylation of the histone tail affect what process?

Gene expression

Why do histones have a high concentration of lysine and arginine?

To bind the negatively charged DNA backbone