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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?
Your assignment, if you want to accept this, is to cross two of the F1 offspring and complete Punnett square for this cross and then write the resulting genotype and phenotypes. This must be 100 percent completely done for any extra credit. Your cros..
Which term describes tonicity of the external solution. Were latitude the only control of temperature, the isotherms would run straight across the map from east to west. Describe one region of the world where this hypothetical isotherm pattern is rea..
Those that live in tropical climates like the savannas of Africa are usually much smaller than the ones that live in arctic regions like Lapland.
He hopes this will slow the evolutionary development of BT resistant insects. Which seed variety must he use the 10 percent of his field that is not planted with BT 123 seeds.
Provide an instance where this definition does not apply and in brief explain why this example does not apply to the species concept.
What is the significance of the chloroplasts structural feature that the thylakoid membrane is located between the stroma and the thyloakoid space.
Case Study: A female patient in ER with suspected toxic shock syndrome
Which of the next statements is untrue of the light reaction in photosynthesis.
The tRNA in the E site will leave and migrate to its aminoacyl-tRNA synthetase d. where the tRNA will be recharged with the correct amino acid.
List and depict at least three prokaryotic cellular features that could be targeted in this way to inhibit or kill a bacterial pathogen.
Illustrate the texture and arrangement of the lungs of the cat. If you were asked to create a karyotype from the chromosome spreads you made from HeLa cells, list materials you could use and describe how you would create the karyotype.
The use of PCR and genetic approaches in biotechnology
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