Chapter 11: DNA and Genes

What is the proper order of steps during DNA repair?

1. recognize 2. remove 3. replace

A particular gene in the genome of an organism contains 30% guanine nucleotides. What percentage of the nucleotides in this gene is adenine?

20%

What is the key enzyme involved in the process of DNA replication?

DNA polymerase

Which of the following explains why all humans are not identical in appearance, behavior, and function?

all humans have slightly different DNA sequences

DNA is called a - because it is built of two strands of DNA nucleotides that are twisted together like a spiral staircase. - bonds between the sugar of one nucleotide and the phosphate of the next nucleotide create a single strand of DNA. The two strands of DNA nucleotides that form a single DNA molecule are held together by - bonds between complementary nitrogenous bases.

double helix, covalent, hydrogen

T or F:The two strands of nucleotides within a single DNA molecule are held together by covalent bonds between nitrogenous bases.

false

The eukaryotic genome contains genes and noncoding DNA. Genes contain both - that are removed after transcription and - that are pasted together to determine the amino acid sequence of a protein. Different genes are separated by noncoding regions known as - and are controlled by noncoding - sequences. - sequences contribute to the architecture of chromosomes.

introns, exons, spacer DNA, regulatory DNA, structural DNA

The process of DNA replication is known as ________ because each new strand of DNA is made up of one strand of the ______ DNA molecule and _____ strand(s) of new DNA nucleotides.

semiconservative, parent, one

what takes place during gene expression

transcription, translation, protein function

T or F:A species of bacteria will express different genes in different environments.

true

T or F:A transposon can insert itself into the middle of a gene disrupting its activity. DNA repair proteins cannot fix this type of disruption.

true