Genetics Ch 10
What is a purine? Select all that apply.
-A base with two rings -Adenine and guanine
Select each of the characteristics that are key features of genetic material
-It must be able to store and express information -It must be variable through infrequent mutation -It must be able to replicate and transmit to progeny
Enter the complementary sequence to the DNA strand shown. 5'- ATCGAACGT -3'
3'- TAGCTTGCA -5'
A structure formed by a single-stranded DNA or RNA molecule that has complementary sequences is
A hairpin
What is the key feature of DNA that allows it to be copied?
Complementary base pairing
If the A content of a DNA is 22%, what are the percentages of the remaining bases?
T= 22 G=28 c=28
Avery, MacLeod, and McCarty's experiments, homogenates from heat-killed bacteria were treated with different enzymes, and then the ability of these homogenates to transform bacteria was assayed. Under which condition would transformation not occur?
Treatment with DNase
A strong covalent bone between adjacent nucleotides is
a phosphodiester bond
The major contribution of Franklin and Wilkins to the study of DNA was
an X-ray diffraction pattern
The sugar in DNA is called "deoxyribose" because it
is missing a 2'-OH group
The number of hydrogen bonds between complementary G-C pairs is
three
Which of the statements describes purines and pyrimidines in DNA molecules?
-Pyrimidines consist of a one-ring structure. -Pyrimidines form hydrogen bonds with purines.
Identify the key structural features of a DNA molecule
-The backbone of DNA is made of a sugar and a phosphate molecule. -DNA bases are always paired with purine and pyrimidine. -DNA strands are antiparallel and include a 5' end and a 3' end.
Identify the pieces of evidence describing the features of DNA that Watson and Crick used to determine the structure of DNA
-The diameter of the DNA double helix is 2 nanometers, with each purine-pyrimidine base pair spanning an equivalent distance between the two chains -A purine base forms bonds to pair with a primidine base located on the opposite DNA strand. Specifically, A pairs with T, and C pairs with G. -The sugar-phosphate backbones of each DNA helix run antiparallel. -DNA forms a right-handed double helical structure with two polynucleotide chains coiled around a central axis.
What does the term antiparallel mean?
-The strands run in opposite directions -the 5' end of one strad is opposite the 3' end of the second strand
A key discovry leading to the structure of DNA was done by Chargaff. He found that ______. Select all that apply.
-The tetranucleotide hypothesis was false. -The amount of A equals the amount of T, and the amount of G equals the amount of C.
