Fossils show that leaves most likely evolved from:
A. algal cells.
B. endosymbiotic cyanobacterium.
C. vascular tissue.
D. photosynthetic stems.
E. lateral meristems.
D
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The oldest megafossils of vascular plants belong to the phylum Rhyniophyta
____________________ Indicate whether the statement is true or false.
The free energy for the oxidation of glucose to CO2 and water is -686 kcal/mol and the free energy for the reduction of NAD+ to NADH is +53 kcal/mol
Why are only two molecules of NADH formed during glycolysis when it appears that as many as a dozen could be formed? A) Most of the free energy available from the oxidation of glucose is used in the production of ATP in glycolysis. B) Glycolysis is a very inefficient reaction, with much of the energy of glucose released as heat. C) Most of the free energy available from the oxidation of glucose remains in pyruvate, one of the products of glycolysis. D) There is no CO2 or water produced as products of glycolysis.
It would be difficult to assess whether the drug-susceptible or drug-resistant phenotype in a population of Mycobacterium tuberculosis was more fit in an environment without antibiotics.
a. true b. false
A needlestick is an example of what portal of entry?
A) Skin B) Parenteral route C) Mucous membranes D) All of these E) None of these