Disturbances to an ecosystem, such as fires and floods, are often seen as negative. Describe a situation where regular disturbances are not only beneficial but are also required to sustain the ecosystem
What will be an ideal response?
Many ecosystems are dependent on seasonal floods to bring in new nutrients or on seasonal fires to clear underbrush or to germinate seeds. In the absence of these events, the organisms that have adapted to those situations would struggle.
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The DNA sequence recognized by restriction endonucleases is generally how long?
a. 1?2 nucleotides b. 4?8 nucleotides c. 10?15 nucleotides d. 24?32 nucleotides e. 36?47 nucleotides
Compare and contrast the structure and function of ion channel-linked receptors, G protein-linked
receptors, and enzyme-linked receptors. In general, how do they differ from intracellular receptors? What will be an ideal response?
Which go these observations gives the most support to the endosymbiotic theory for the origin of eukaryotic cells?
a. the existence of structural and molecular differences between the plasma membranes of prokaryotic and the internal membranes of mitochondria and chloroplasts b. the similarity in size between the cytosolic ribosomes of prokaryotes and the ribosomes within mitochondria and chloroplasts c. the size disparity between most prokaryotic cells and most eukaryotic cells d. the observation that some eukaryotic cells lack mitochondria
Answer the following questions true (T) or false (F)
1. State whether the following statement is true or false, then give your reasoning. The terminating "hairpin" loop occurs in the trp operon when sufficient tryptophan is present.