Exam 14: Dna and Genes

Bacterial cultures are sometimes exposed to ultraviolet (UV)light in order to generate organisms with new genetic traits. Why do microbiologists choose to use UV light for this purpose?

In the figure below, are the genes that encode the enzymes needed to make tryptophan on or off?

A rapidly dividing cell is exposed to a chemical that converts the bond that forms between adenine and thymine to a covalent bond. Which of the following is most likely to occur?

Once replication in a DNA molecule is complete, each new DNA molecule contains

Would you expect the presence of spacer DNA to increase or decrease the frequency of linkage between genes?

Avoiding the use of hairspray during the time in pregnancy that the genitals form (8-15 weeks)may reduce your baby's risk of hypospadias.

The sequence of bases along a single strand of DNA is complementary.

The figure below illustrates DNA undergoing replication. The region indicated by the arrow in this image represents a

One level of DNA packing involves the DNA being wound around

During ____________________ diagnosis, cells are removed from the early embryo and tested for genetic disorders before being implanted in the uterus.

To repair DNA, a protein cuts out the damaged section.

DNA replication

Is a species that lacks DNA repair mechanisms likely to have more or fewer variations between individuals than a species that possesses repair mechanisms?

This figure shows a short sequence of DNA. During DNA replication, the piece of DNA depicted below will produce

Which is not a way that cells can control gene expression?

A(n)____________________ is a DNA sequence that is capable of moving from one position to another.

A repressor protein binds to the operator of a group of genes to turn ____________________ [on or off] their gene expression.

Mutations can lead to the formation of new alleles of a gene.

What is not true of the five different cell types from the individual shown in the figure below?

Housekeeping genes