To make copies of specific DNA sequences in the lab, scientists use polymerase chain reaction (PCR). During PCR, heat is used to “unzip” the two strands that comprise the DNA molecule. PCR mimics DNA replication in some ways, but not in how the two strands are pulled apart. How are the two strands of DNA unzipped during DNA replication in the cell? 

“Splicing” is one way eukaryotic organisms regulate gene expression. What is involved in the process of splicing?

We reviewed multiple definitions of life, including one from the textbook. All of these definitions identified a common set of basic characteristics that must be met for something to be considered alive. Which of the following characteristics is not included in the basic definition of life?

Interactions in gene networks describe…

Identify three statements that are TRUE of mitosis.

Each messenger RNA (mRNA) codon corresponds to…

“Splicing” is one way eukaryotic organisms like humans regulate gene expression. What is involved in the process of splicing?

A tumor that has spread to many organs has entered the stage of _______.

Which of the following correctly describes the process of gene expression?

A man has wet earwax. His wife and their daughter have dry earwax. Wet earwax is an autosomal dominant trait. The couple is expecting a second child. What is the probability that this child will have wet earwax like his father? Enter your answer as a number between 0 and 1.