- | Page
Bio Beyond: Genetic Replication Questions With
Complete Solutions
Question 1: Looking at the images, how many chromosomes are
there in a typical human?
CORRECT ANSWER : 46
Question 2: What do you notice about the chromosomes in both
images?
CORRECT ANSWER : They come in pairs
Question 3: Why are chromosomes a poor way to think of how
DNA is normally stored?
CORRECT ANSWER : DNA only looks like this during
replication
Question 4: The top image, called a karyogram or karyotype, is
from a human female, while the bottom one is from a human male. What major difference do you notice?
CORRECT ANSWER : The male has a set of mismatched
chromosomes
- | Page
Question 5: Thinking back to what you learned about genetics,
what do the colored bands on the chromosome represent?
CORRECT ANSWER : Genes
Question 6: What do the images pointing to each colored band
represent?
CORRECT ANSWER : Phenotypes
Question 7: Which of the following characteristics are different
between prokaryotic and eukaryotic chromosomes?
CORRECT ANSWER: Shape
Question 8: From your exploration of DNA structure and
biological macromolecules, what do you recall is the function of DNA in the cell?
CORRECT ANSWER : Information storage
Question 9: Where is the information stored in DNA?
CORRECT ANSWER : Base sequence
- | Page
Question 10: Looking at the image to the right, what has to be
done to chromatin before the information in it can be accessed?
CORRECT ANSWER : It has to be unwound to uncoiled DNA
Question 11: From chromatin, two major processes are needed
to prepare for DNA replication. Watch the video at right - what processes are needed before new DNA can be made? Select all that apply.
CORRECT ANSWER : DNA has to be uncoiled, Bonds between
bases have to be broken
Question 12: What type of bonds are broken when the strands
are split apart?
CORRECT ANSWER : Hydrogen bonds
Question 13: It's important to know the base pairing rules for
DNA before proceeding. Which of the following are valid pairings for DNA? Select all that apply
CORRECT ANSWER : A-T, C-G
- | Page
Question 14: One last question: How many bases do you think can be added to the new DNA strand each minute by the enzymes in your cells?
CORRECT ANSWER : 2
Question 15: What is an isotope?
CORRECT ANSWER : An atom with a different number of
neutrons than normal
Question 16: What does each model predict for the new DNA
molecules? Connect each box on the left to one box on the right.No boxes are connected twice.
CORRECT ANSWER : Conservative Model - One light and one
heavy DNA molecule, Semi-Conservative Model - Two DNA molecules halfway between light and heavy, Dispersive Model - Two DNA molecules of different masses between light and heavy
Question 17: Is the DNA of the first generation grown in the
presence of light nitrogen heavier or lighter than the original generation's DNA?