The bottom of the ocean floor is not considered part of the biosphere because no sunlight reaches it.
Answer the following statement true (T) or false (F)
False
Any place where organisms are found on planet Earth is part of the biosphere.
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If two organisms look completely different but you suspect they may be related, which of the following would be the most useful information to have?
A. fossils B. anatomical information C. DNA comparisons D. None of these answers is useful.
Enzymes function primarily by
a. forcing the reactants into an altered environment which in turn creates a change in the free energy of the reactants relative to the products. b. altering the equilibrium point of a particular reaction to favor the formation of products. c. increasing the probability that the reactants will come into close proximity to each other in the proper orientation for forming the transition state molecule. d. removing reactants from solution in a set ratio that enhances the chances of the remaining individual reactants interacting with each other. e. changing the ratio of reactants to products so that the forward reaction is favored.
Select the enzyme that does not match the reaction:a
sucrase?splits sucrose into glucose and fructose b. lipase?breaks ester linkages c. phosphatase?removes phosphate groups d. urease?converts urea to ammonia and CO2 e. kinase?breaks peptide bonds
Crossing over is one of the most important events in meiosis because
a. it produces new combinations of alleles on chromosomes. b. homologous chromosomes must be separated into different daughter cells. c. the number of chromosomes allotted to each daughter cell must be halved. d. homologous chromatids must be separated into different daughter cells. e. it decreases genetic diversity.