Explain why the structure of a DNA molecule is often described as a zipper.

A scientist uses radioactive nitrogen to label the nitrogenous bases of the DNA of a cell. Then the DNA is allowed to replicate, and the new strands take up non- radioactive bases. Do one, both, or neither of the daughter cells have radioactive DNA? Explain.

How does DNA replication compare between prokaryotes and eukaryotes?

How do the nucleotides in DNA bond with each other within a strand? How do they bond with each other across strands?

A replication fork moves about 50 times faster in prokaryotic DNA than in eukaryotic DNA. Use the structure of DNA in prokaryotes and eukaryotes to explain this difference.

Describe the structure of a nucleotide.

DNA can be modeled as an elastic rod that can be twisted or bent. Suppose a $\mathrm{DNA}$ molecule of length $L$ is bent such that it lies on the arc of a circle of radius $R_{c}$. The reversible work involved in bending $\mathrm{DNA}$ without twisting is $w_{\text {bend }}=\frac{B L}{2 R_{C}^{2}}$ where $B$ is the bending force constant. The $\mathrm{DNA}$ in a nucleosome particle is about $680 . \text{\AA}$ in length. Nucleosomal $\mathrm{DNA}$ is bent around a protein complex called the histone octamer into a circle of radius $55 \text{\AA}$. Estimate the reversible work involved in bending the $\mathrm{DNA}$ around the histone octamer if the force constant $B=2.00 \times 10^{-28} \mathrm{~J} \mathrm{~m}$.

What is the role of DNA polymerase in DNA replication?

What is the role of DNA polymerase in the process of DNA replication?

Solve each equation on the interval $0 \leq \theta<2 \pi$, $\csc ^{2} \theta=\cot \theta+1$

Find the period, and sketch the graph. $y=3 \tan x$

Review the vocabulary words listed. Match the words with the definitions below. Acid, atom, base, compound, covalent bond, element, ion, ionic bond, isotope, metabolism, mixture, molecule, nucleus, pH, solution, diffusion, dynamic equilibrium, hydrogen bond, polar molecule, amino acid, carbohydrate, enzyme, isomer, lipid, nucleic acid, nucleotide, peptide bond, polymer, protein. All of the chemical reactions within an organism

In 2015, My-Lien received $10,000 from her grandmother. Her parents invested all of the money, and by 2027, the amount will have grown to$16,960. a. Write an exponential function that could be used to model the money y. Write the function in terms of x, the number of years since 2015.

Which of the following researchers used radioactive markers in experiments to show that DNA was the genetic material in cells? a. Frederick Griffith b. Oswald Avery c. Alfred Hershey and Martha Chase d. James Watson and Francis Crick