Chapter 13 + 14 quiz
DNA consists of two antiparallel strands of nucleotides held together by
hydrogen bonds
Why does the DNA double helix have a uniform diameter?
purines pair with pyrimidines
How many Barr bodies does a normal human female contain in each diploid cell?
2
Bonus: If 14% of the nucleotides from a DNA molecule contain the base T, what percent will contain the base G?
36%
New combinations of linked genes are due to which of the following?
Crossing Over
A Barr body is normally found in the nucleus of which kind of human cell?
Somatic cells of a female only
Which is not a component of nucleic acids?
Sulfur
In humans, if an XY individual had a deletion of the SYR gene, that person would
develop as a female
Watson and Crick developed a model of DNA in which the two strands twist into the shape of a ________.
double helix
Certain genetic recessive disorders, like color-blindness, are more common in males. Why?
the gene is located on the X chromosome
________ is the genetic material for all cellular organisms and some viruses.
DNA
During replication, which enzyme opens the DNA double helix?
DNA helicase
Which of the following investigators was/were responsible for the following discovery? In DNA from any species, the amount of adenine equals the amount of thymine, and the amount of guanine equals the amount of cytosine.
Erwin Chargaff
People with Turner syndrome have a genotype characterized as which of the following?
Females with one X chromosome
Mendel. Watson. Griffith. Crick. Morgan.
Morgan
Occasionally, chromosomes fail to separate during meiosis, leading to daughter cells that have an abnormal number of chromosomes. This phenomenon is called
Nondisjunction
The frequency of crossing over between any two linked genes will be which of the following?
Proportional to the distance between them
If we think of the DNA double helix as a twisted ladder, what makes up the rungs or steps of the ladder?
Purines and Pyrimidines
The method of DNA replication, where each original strand is used as a template to build a new strand, is called the
Semiconservative method
One possible result of chromosomal breakage is for a fragment to join a nonhomologous chromosome. What is this alteration called?
Translocation
During DNA replication, DNA Polymerase I removes the RNA primers and then fills in the gap.
True
When a female only has 1 X chromosome X chromosome inactivation.
Turner syndrome
Of the 23 pairs of human chromosomes, 22 pairs are homologous and are found in both males and females. These are called ________.
autosomes
Because the two strands of a DNA molecule are ________ to each other, each one can be used as a template to reconstruct the other.
complementary
The chemical bond connecting one nucleotide with the next along one strand of a DNA molecule is called a
covalent bond
Which of the following separates the DNA strands during replication?
helicase
What kind of chemical bond is found between paired bases of the DNA double helix?
hydrogen
In Morgan's experiments, the allele for eye color in Drosophila was shown to be
located on the X chromosome