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If humans had been present to build log structures during the Carboniferous period (they weren't), which plant type(s) would have been suitable sources of logs? A) horsetails and bryophytes B) charophytes, bryophytes, and gymnosperms C) lycophytes and bryophytes D) whisk ferns and epiphytes E) ferns, horsetails, and lycophytes
plating .1ml of a sample diluted by a factor of 10^-3 produced 43 colonies. what was the original concentration in the sample?
The parasympathetic nervous division is central to maintaining homeostasis of the body. Pick one of the oxygen delivery organs and one of excretory or digestive organs.
Present two factors contributing to the solid waste problem in the U.S. How could these factors be changed or controlled for the better? What problems are there with current recycling efforts? What is being done in your area relative to recycling?
Describe the hemolysis produced by alpha-hemolytic, beta-hemolytic, and nonhemolytic streptococci.
When isolated chloroplasts are incubated with the artificial electron acceptor 2,6-dichlrophenol-indophenol (DCPIP) and then illuminated with red light, DCPIP (dark blue color) is reduced to DCPIPH2 (clear color). During illumination, oxygen is re..
Which of the following do NOT perform function in the nucleus? Transcription factor proteins, ribosome, RNA polymerase or DNA polymerase?
At puberty, the adolescent female body changes in both structure and function of several organ systems, primarily under an influence of changing concentrations of estrogen and other steroid hormones. How can one hormone, such as estrogen, mediate so ..
What are the physical changes needed in the body that would require to happen in order for our bodies to live forever. Changes such as telomerase activity, collagen flexibility, environmental changes, role of the immune system, DNA repair enzymes:..
Transcription factor X binds to a response element in gene A and gene B. In muscle cells, transcription factor X activates transcription of gene A. In neuronal cells,
What combination(s) of chromosomes are possible in haploid cells following both divisions of meiosis? (Hint: remember independent assortment). A diploid cell contains three pairs of homologous chromosomes designated C1 and C2, M1 and M2, and S1 and S..
How various ATP equivalents are required to synthesize de novo one molecule of IMP, starting from ribose-5-phosphate? Presume that all required precursors in the pathway are present.
Assume that the rate of sea-floor spreading was constant during the 1-million-year period depicted above, what have to be the approximate age of marine fossils found in undisturbed sedimentary rock instantly overlying the igneous rock at the arrow la..
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