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Early researchers expected the genetic material to be protein rather than DNA because
Question 1 options:
proteins have more than 20 different monomers, while DNA has only 4; DNA just seemed too simple to carry complex genetic instructions.
they hadn't yet found any DNA inside nuclei, only proteins.
nucleic acids seemed simple, repetitive, and uninteresting, compared to proteins.
with their almost limitless variation in structure and function, proteins seemed complex enough to contain genetic information.
Question 2 Avery, MacLeod, and McCarty demonstrated that DNA alone was enough to transform (i.e., change the phenotypes of)Staphylococcus pneumoniae by
Question 2 options:
showing that if S strain DNA was destroyed using a DNAase, the R-strain would not become virulent because the R-strain DNA had been destroyed.
using an enzyme that destroyed S strain RNA; R cells that received this solution became virulent.
showing that if S strain DNA was destroyed using a DNAase, the R strain would not become virulent because the genes for the protective polysaccharide capsule were destroyed.
using an enzyme that destroyed S strain proteins; R-stain cells that received this solution did not become virulent.
Question 3 Avery, McCloud, & McCarty supported Griffith's conclusions with their own experiments in 1944
Question 3 options:
by showing that DNA was the "transforming principle".
but their work had little impact, in part because few scientists at the time thought that what went on in bacteria was in any way related to processes in more complex life forms.
but their work convinced most scientists of the time, by showing that DNA was just as complex as protein.
when they showed that either DNA or protein isolated from the S strain was sufficient to transform the R strain.
Question 4
The complementary strands that make up a DNA molecule are said to be antiparallel because
Question 4 options:
weak hydrogen bonds hold the 2 strands together, while strong covalent bonds bind one nucleotide to the next in the backbone of the molecule.
the 5' end of one polynucleotide matches up with 3' end of the other.
each of the nucleotides on one strand is flipped in orientation, relative to the nucleotides on the other strand.
a purine always matches up with a pyrimidine in pair-bonding.
Question 5
Erwin Chargaff discovered some regularities about the relative percentages of adenine, guanine, cytosine, and thymine in DNA. Which of the following statements is/are true regarding this topic?
Question 5 options:
If DNA from a cell is analyzed, and found to contain 40% adenine, it will also have 10% guanine.
Fifty percent of the DNA nucleotides will be purines.
If DNA from a cell is analyzed, and found to contain 40% adenine, it will also have 40% cytosine.
If DNA from a cell is analyzed, and found to contain 40% adenine, it will also have 20% cytosine.
Three Hfr strains of E. coli are known to transfer their genetic material during conjugation in different sequences. Given the time of entry of the markers into the F- recipient,
Plasmids, which are associated with membrane proteins, depend on bacterial chromosomal DNA for replication. If the genome contains ~30,000 genes, about how many genes would be removed by a deletion of DNA that might be detected by karyotype analysis.
Compare gymnosperms to angiosperms. What are some differences and similarities between a pine cone and a fruit? Give examples of each group.
Identify the main biological organic compounds and identify and explain three functions of lipids and why lipids do not mix with water.
when is the S2 gene expressed in Gametophyte Self-incompatibility ; before or after the meiosis that separates the S1 and S2 alleles
A patient has blood with a pH of 7.35. Predict the direction of PCO2, for a condition which is consistent with respiratory acidosis. What compensation acts to restore pH to near the value of pH 7.4?
q1.what is the composition of the breast?q2.what muscle is deep to the base of the breast?q3.the tail of the breast
Briefly explain why an acetylcholine antagonist would speed the heart. Briefly explain why certain neurons must have glucose availablefor metabolism and which neurons they tend to be. Identify the structures from which cerebrospinal fluid isabsorbed ..
Why is bone an example of connective tissue? how is osseous tissue different from other forms of adult connective tissue? differentiate the cells of osseous tissue.
karen and Steve each have a sibling with sickle-cell disease. Neither Karen nor Steve nor any of their parents have the disease, and none of them have been tested to reveal sickle-cell trait. Based on this incomplete information, calculate the probab..
Which of the following are the Crown Groups of flowering plants? Mark all that apply.
Biochemists make stock solutions of reagents and use them to make working concentrations of buffers. Explain how to construct these stock solutions. You decide on the final volumes and show your calculations
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