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why was the belief in spontaneous generation consider as an obstacle to the development of microbiology as a scientific discipline
angela's physician suspects that angela has just suffered a myocardial infarction, or heart attackshe tells angela that she is going to take a blood sample so that the hospital lab can perform a test to confirm her diagnosis . what information can angela's blood yield to help the physician?
Black fur (B) is dominant to white fur (b) in guinea pigs. An F1 cross was conducted and resulted in 100% heterozygous guinea pigs (Bb). What is the genotypic ratio outcome of the F2 generation which would cross two heterozygotes?
I am doing an investigation on the distribution of catalase enzyme in potato tissue. I would like to know what affects how an enzyme is distributed in potatoes. Is potato tissue more active on the inside core or on the outside skin?
1. Compare between the structure of the ribosomes in prokaryotic and eukaryotic cells? (1 point):
2. Explain how exo-enzymes produced by bacteria which digest different macro-molecules in the surrounding environment, won’t digest these molecules inside the bacterial cells? (1 point):
3. In the peptidoglycan layer of bacterial cells: give a reason why the tetrapeptide side chain is only binding to the NAM molecule and not to the NAG?
4. Two types of prokaryotic cells can be distinguished: bacteria and archaea. How do these cells differ from each other? Compare their cell wall structure, patterns of cytoplasmic membranes and ribosomal entities and 16S-rRNA? (1.5 points):
5.Compare between the structure of cell wall in prokaryotic and eukaryotic cells?
When the citric acid cycle was first proposed by Krebs, the “problem” was not that a chiral molecule was produced from a non-chiral molecule—this is easily understood. The difficulty was in understanding why formation of the double bond of cis-aconitate, and subsequent addition of water to form isocitrate, occurred only in the moiety contributed originally by oxaloacetate and not in the group derived from acetyl CoA. When isotopically labeled acetate was added to cells the 14 C-labeled carbon atoms appeared in citrate. Since citrate is a symmetric molecule, the labeled carbon atoms were expected to show up equally in the two versions of isocitrate by arrows 1 and 2. Instead, only the left-hand form was produced. This mystery was later solved and find out the reason why only form form is produced?
In three separate experiments of Krebs cycle, pyruvate labeled with 14 C at C-1, at C-2, or at C-3 is metabolized via the pyruvate dehydrogenase complex and the citric acid cycle.
a.Which labeled pyruvate molecule is the first to yield 14 CO2 ?
b.Which is the last to yield 14 CO2 ?
c.How many turns of the cycle are required to release all of the labeled carbon atoms as 14 CO2 ?
You prepared a cell-free extract from a pigeon muscle. When glucose is added to the extract and incubated in an atmosphere free of oxygen, the extract efficiently converts glucose to lactate. You decide to use this extract to study the mechanism of action of a novel chemical, that you have synthesized known to inhibit glycolysis. When you add glucose and the chemical to the extract in oxygen free atmosphere you find that fructose 1-6 bisphosphate, DHAP AND GAP all accumulate. However 1,3BPG, PEP and pyruvate are present in relatively low levels. Based on the evidence so far, identify the enzyme that is inhibited by your chemical.
The malate synthase reaction, which produces malate from acetyl-coA and
glyoxylate in the glyoxylate pathway involves chemistry similar to citrate synthase
reaction. Find out the similarities between these two.
A pure - breeding black pig is crossed with a pure - breeding white prg & work out the genoty pic & Phenoty psc raciso of fland fy of spring, if gene for block coat as domination
