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1. The common ancestor of all the tetrapod vertebrates had four limbs with a similar skeletal structure to thatseen in many vertebrates today. Considering this, in what sense are the arms of humans homologous to thewings of a bird?
2. The green algal ancestors of plants existed in aquatic habitats, contained chlorophyll a and b, and had cellwalls composed mainly of cellulose. Land plants also contain chlorophyll a and b and have cell walls ofcellulose. What traits in the land plants are primitive? What trait represents divergent evolution from theancestral form?
3. The ancestors of hominids were quadrupeds, walking on four legs. Humans are bipedal. Is this characterderived or ancestral? Are the walking habits of chimpanzees primitive or advanced?
Suppose that you have discovered two different transposable elements (A and B) in yeast and you inserted an intron into each of the elements. Following transposition of each transposable element, you examine the transposed elements to determine if..
Identify two differences between the bacteria and protist kingdom. If you were testing the effects of different brands of fertilizer to detemine which one promoted best growth over six weeks.
F.P. is a 66-year-old man hospitalized for surgical management of an enlarged prostate. His chart indicates that he has had Parkinson disease for 5 years prior to admission, managed with a dopamine precursor (levodopa/carbidopa).
In cattle, coats may be solid white, solid black, or white and black spotted. When true breeding solid whites are crossed to true-breeding solid blacks, the F1 generation consists of all spotted individuals.
Explain in molecular detail how scientists could develop antibiotics that contact multiple sites on rRNAs and /or r-proteins within the bacterial ribosome.
A Case Study on the Respiratory System
what is one area of health care worker shortage? what is the reason for this shortage? how would you address this
Synthesis of fatty acids requires the movement of citrate out of the mitochondria. This occurs under conditions of high levels of acetyl CoA which is required to stimulate the activity of:
Assume you are working in a winery. You just determined that a wine sample contained 3.0 × 108 yeast/ml by analyzing its turbidity.
A cross between two pink snapdragon plants produces 46 Red snapdragons, 115 pink snapdragons, and 42 white snapdragons.
If a single E.coli cell is placed on a LB agar plate in the final stage of the quadrant streak method, how many cells would make up the resulting colony after 2 hours, and after 24 hours incubation at 37 C? explain how you get your results.
What distinguishes reversible inhibitors from irreversible inhibitors - There is an equilibrium between bound and unbound reversible inhibitor. There usually is little back reaction for the binding of an irreversible inhibitor.
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