What are Group I and Group II introns, where are they found, and what makes them different from other introns?
What will be an ideal response?
Ans: Group I and II introns are distinct from introns in most eukaryotic nuclear genes in their location and splicing mechanism. They are found primarily in organellar and bacterial genes, and are capable of autosplicing; the RNA of the introns themselves serves as the catalytic molecule for their own excision.
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Meiosis results in a reassortment of maternal chromosomes (inherited from the mother) and paternal chromosomes (inherited from the father). If n=4 for a given species, and ignoring the effects of crossing over, what is the probability that a gamete will receive only paternal chromosomes?
A. 1/2 B. 1/4 C. 1/8 D. 1/16 Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you know about independent assortment? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Eukaryotic ribosomes may be free in the cytoplasm or attached to the ________.
What will be an ideal response?
Four of the five types of organisms listed below are
heterotrophs. Select the exception. a. consumers b. carnivores c. herbivores d. parasites e. producers
Water flow across the gills of fish that maximizes the efficiency of gas exchange is known as _____.
A. capillary movement B. countercurrent exchange C. deoxygenation D. pharyngeal movement E. osmosis