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Q. Birds and mammals have a four-chambered heart, with two ventricles and two atria, but other modern reptiles have a three-chambered heart, with just one ventricle. Paleontologists debate whether dinosaurs had a typical "reptile-like" heart or a "birdlike" heart. Long-necked sauropod dinosaurs could have had unusual circulatory demands because their head may have been raised far above their heart. The farther the head is above the heart, the greater the systolic pressure needs to be for blood to reach the brain. For example, the long-necked dinosaur Brachiosaurus may have carried its head as much as 6 m (20 feet) above its heart. It is estimated that such an anatomy demanded a systolic blood pressure of 500 mm of mercury for blood to reach the brain! Some paleontologists think this to be evidence that dinosaurs should have had a four-chambered heart that supported a dual circulatory system similar to that of birds and mammals, rather than three-chambered heart of non bird reptiles. Can you explain why?
The pH of the inner thylakoid space had been measured, as have the pH of the stroma and the cytosol of a particular plant cell. Why will this cause the pH in the thylakoids to be lesser than the pH in the stroma.
Describe what you observed in your cheek smear wet mount, direct stained slide, and indirectly stained slide. What were similarities and differences. Describe what you observed in your yeast wet mount, direct stained slide, and indirectly stained sli..
A man and a woman are both carriers for 2 autosomal recessive disorders, PKU and cystic fibrosis. If they have a daughter, what is the possibility that she will have PKU but not cystic fibrosis.
Assume that a mutation occurs in an intron of a gene encoding a protein. What would the most probable effect of the mutation be on the amino acid sequence of that protein.
What trends would they have noticed in Earth's terrestrial vegetation over this period.
Calculate how the permeability of each is altered when the pH is reduced to 1.0, a value typical of the stomach.How to demolish the function of this protein.
Glucose oxidase is an enzyme that can be used for measurements of glucose levels by combining this reaction with an oxygen probe.
What provides a shortest-term mechanism for preventing acid-base imbalances in the body? The longest-term mechanism? Describe each in specify.
Two linked genes, S and T, are separated by 8 cM. Peter, who has the genotype ST/st, marries Oliviam who is st/st. peter's father was ST/ST. what is the probability that peter and olivia's first child will be St/st? What is the possibility that their..
What is most likely genotype of the father? Mother? If the seventh child had blue eyes what could you conclude about parents genotyoes. What possible dissimilarity between these forms would give chemists a clue that open-chain form was not present.
In our population there are 300 red sea stars, 200 pink sea stars and 500 White Sea stars. How numerous total alleles for sea star colour are in this population.
Using Rasmol produce an image of oxidoreductase structure code 2XXE that, clearly illustrates the location of the catalytic site of the enzyme. State and show in an image the active site residues.
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