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Among bryophytes, only the sporophytes of mosses and hornworts have stomata, whereas stomata are missing from liverwort sporophytes. If the common ancestor of all bryophytes had sporophytes that bore stomata, then which of these might account for their absence from liverwort sporophytes? If, in contrast to early mosses and hornworts, early liverwort sporophytes had A) decreased need to broadcast spores long distances. B) increased robustness (i.e., thicker, more massive tissues). C) increased nutritional independence from the gametophyte. D) more-effective transport of glucose from gametophyte to sporophyte.
After Drosophila DNA has been treated with a restriction enzyme, the fragments are inserted into plasmids and selected as clones in E. coli. With the use of this "shotgun" technique, every DNA sequence of Drosophila in a library can be recovered.
From the list given below what options applies to fibrous proteins. Monomers are held together by covalent glycosidic linkages.
Determine the proportion of the lung cancers attributable to smoking among: smokers and the whole population.
Assume you have identified a mutant E. coli strain that cannot synthesize histidine. To determine the location of the his- mutation on the E. coli chromosome.
In plants three genes exhibit simple dominant recessive inheritance for R black stem red stem; tall (D) and dwarf(d); and full pods (C) or constricted pods (c ) In a cross of RrDdcc X Rr dd Cc what percentage of progeny are RRdd cc ?
Provide the number of divisions, number of daughter cells, what each process creates, and the steps for both mitosis AND meiosis.
Two strands of a DNA molecule are radio-labeled such that each strand can be uniquely identified. After three bouts of replication, how many new molecules of DNA are formed? How many strands of DNA are radio-labeled? Are both radio-labeled strands..
If you wanted to measure the absorbance of hemoglobin, the red pigment of your red blood cell, what wavelength would be best? Explain why.
What, if anything, is wrong with the following statement: "the oxygen consumed during the oxidation of glucose is animal cells returned as part of CO2 to the atmosphere." How could you support your answer experimentally?
jeff and trina collected some wildflower seeds from a medow and scattered them along the roadside near their home. As the weather got hotter, some of the seedlings began to wither.
In human body, substances from blood filter through a membrane into renal tubule (kidney). What does an increase in the driving pressure correspond to?
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 "birdl..
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