Escherichia coli and Salmonella can live in our intestines in the presence or absence of oxygen. They are considered which of the following?
What will be an ideal response?
Facultative anaerobes
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Which of the following statements is/are true? Choose all that apply
A. The energy of the starting materials for a reaction will equal the sum of energies of the products plus energy released as heat and disorder. B. The amount of useable energy resulting from a reaction will always be less than the total energy available in the starting materials. C. The entropy of the products of a reaction will always be greater than the entropy of the starting materials. D. The entropy of the starting materials for a reaction will always be greater than the entropy of the products.
According to Fig. 9.6, what is a key difference between cell signaling mediated by a surface receptor, compared to that mediated by an intracellular receptor?
A. Cell-surface receptors bind to specific signaling molecules; intracellular receptors bind any signaling molecule. B. Cell-surface receptors typically bind to smaller signaling molecules than those bound by intracellular receptors. C. Cell-surface receptors bind polar signaling molecules; intracellular receptors bind nonpolar signaling molecules. D. Signaling molecules that bind to cellsurface receptors lead to cellular responses restricted to the cytoplasm; signaling molecules that bind to intracellular receptors lead to cellular responses restricted to the nucleus. E. None of these statements about cell signaling differences is correct.
At what stage of animal development do cells first move from the surface of the embryo into the interior, resulting in a two- or three-layered embryo?
A. zygote formation B. blastulation C. neurulation D. gastrulation E. metamorphosis
The products of the Krebs cycle include
A) ATP only. B) carbon dioxide and energy carriers only. C) carbon dioxide only. D) energy carriers only. E) ATP, carbon dioxide, and energy carriers.