- ____________ causes the thorax to collapse; organs hemorrhage and rupture.
- Figure 1 represents a metabolic process involving the regulation of lactose metabolism by E. coli bacteria. Lactose is utilized for energy by E. coli when glucose is not present. Allolactose is an isomer of lactose that is in the environment of these bacteria when lactose is present. The CAP site prevents the binding of RNA polymerase when glucose is present in the environment. The lacZ, lacY, and lacA genes code for proteins needed for lactose metabolism.Figure 1. Model of lac operon, comparing repressed and active statesWhich is a scientific claim that is consistent with the information provided and Figure 1 ?(A)The presence of excess lactose blocks the functioning of RNARNA polymerase in this operon.(B)When bound to the operator, the repressor protein prevents lactose metabolism in E. coli.(C)The binding of the repressor protein to the operator enables E. coli to metabolize lactose.(D)Allolactose acts as an inducer that binds to the operator, allowing E. coli to metabolize lactose.
- Enzyme used to position nucleotides during DNA replication(A)DNA ligase(B)DNA polymerase(C)RNA polymerase(D)Restriction enzyme(E)Reverse transcriptase
- How many Americans die each day from cancer?
- Enzyme used in the synthesis of mRNA(A)DNA ligase(B)DNA polymerase(C)RNA polymerase(D)Restriction enzyme(E)Reverse transcriptase
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- Erwin Chargaff investigated the nucleotide composition of DNA. He analyzed DNA from various organisms and measured the relative amounts of adenine (A), guanine (G), cytosine (C), and thymine (T) present in the DNA of each organism. Table 1 contains a selected data set of his results.Table 1. Nucleotide composition of sample DNA from selected organisms Which of the following statements best explains the data set?(A)Since the %A%A and the %G%G add up to approximately 50 percent in each sample, adenine and guanine molecules must pair up in a double-stranded DNADNA molecule.(B)Since the %A%A and the %T%T are approximately the same in each sample, adenine and thymine molecules must pair up in a double-stranded DNADNA molecule.(C)Since the %(A+T)%(A+T) is greater than the %(G+C)%(G+C) in each sample, DNADNA molecules must have a poly-AA tail at one end.(D)Since the %C%C and the %T%T add up to approximately 50 percent in each sample, cytosine and thymine molecules must both contain a single ring.
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- The Trp operon is a coordinately regulated group of genes (trpA-trpE) that are required for tryptophan biosynthesis in E. coli. Based on the figure above, which of the following correctly describes the regulation of the Trp operon?(A)In the absence of tryptophan, the repressor is active and binds to the Trp operator, preventing RNA polymerase from transcribing the operon.(B)In the presence of tryptophan, the repressor is active and binds to the Trp operator, preventing RNA polymerase from transcribing the operon.(C)In the absence of tryptophan, the trpR gene is inactive, preventing the production of the repressor that blocks expression of the operon.(D)In the presence of tryptophan, the trpR gene is inactive, preventing the production of the repressor that blocks expression of the operon.
- Enzyme found in retroviruses that produce DNA from an RNA template(A)DNA ligase(B)DNA polymerase(C)RNA polymerase(D)Restriction enzyme(E)Reverse transcriptase
- In a transformation experiment, a sample of E. coli bacteria was mixed with a plasmid containing the gene for resistance to the antibiotic ampicillin (ampr). Plasmid was not added to a second sample. Samples were plated on nutrient agar plates, some of which were supplemented with the antibiotic ampicillin. The results of E. coli growth are summarized below. The shaded area represents extensive growth of bacteria; dots represent individual colonies of bacteria.I) No AMP- lawnIII) No AMP/Plasmid- lawnII) AMP- noneIV) AMP/Plasmid- speckledWhich of the following best explains why there is no growth on plate II?(A)The initial E. coli culture was not ampicillin-resistant.(B)The transformation procedure killed the bacteria.(C)Nutrient agar inhibits E. coli growth.(D)The bacteria on the plate were transformed.
- Which of the following statements best explains the structure and importance of plasmids to prokaryotes?(A)Plasmids are circular, single-stranded RNARNA molecules that transfer information from the prokaryotic chromosome to the ribosomes during protein synthesis.(B)Plasmids are circular, double-stranded DNADNA molecules that provide genes that may aid in survival of the prokaryotic cell.(C)Plasmids are single-stranded DNADNA molecules, which are replicated from the prokaryotic chromosome, that prevent viral reproduction within the prokaryotic cell.(D)Plasmids are double-stranded RNARNA molecules that are transmitted by conjugation that enable other prokaryotic cells to acquire useful genes.
- For the following group of questions first, study the description of the situation or data and then choose the one best answer to each question following it and fill in the corresponding oval on the answer sheet.The diagram below illustrates the results of electrophoresis of DNA sequences obtained from a family of two adults and three children, and amplified using PCR. The bands represent short repeating sequences of variable length. Results for another female (X) are included for comparison.Father- 1, 2, 3 Mother- 1, 2, XChild 1- father, mother, 2, XChild 2- mother, father, 1, 3Child 3- 2, fatherX- mother, 1, 2Which of the following is the best explanation for the fragment pattern for individual X ?(A)She has only one member of this chromosome pair.(B)She has only one living parent.(C)She is homozygous for this particular DNA fragment.(D)She is the mother's child from another marriage.(E)She is not related to any member of the family being tested.
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- ____________ causes loss of fluids and plasma proteins.
- _____________ causes vasoconstriction and ice crystal formation causing cellular swelling.
- What was the council of 500 citizens and who made it.
- Remaining tissue from caseous necrosis resembles:
- What year did New Jersey become a royal colony?
- Dorian warriors introduce Greeks to make what