Which of the following statements about exergonic
reactions is false?
a. They release energy.
b. Glucose metabolism is an example.
c. Their products have more energy than the
reactants.
d. Some energy is converted to less biologically
useful forms.
e. Bonds are broken.
Answer: c
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H. V. Wilson worked with sponges to gain some insight into exactly what was responsible for holding adjacent cells together. He exposed two species of differently pigmented sponges to a chemical that disrupted the cell-cell interaction (cell junctions)
, and the cells of the sponges dissociated. Wilson then mixed the cells of the two species and removed the chemical that caused the cells to dissociate. Wilson found that the sponges reassembled into two separate species. The cells from one species did not interact or form associations with the cells of the other species. How do you explain the results of Wilson's experiments? A) The two species of sponge had different enzymes that functioned in the reassembly process. B) The molecules responsible for cell-cell adhesion (cell junctions) were irreversibly destroyed during the experiment. C) The molecules responsible for cell-cell adhesion (cell junctions) differed between the two species of sponge. D) One cell functioned as the nucleus for each organism, thereby attracting only cells of the same pigment.
Rods are
A. concentrated in the fovea. B. sensitive mainly to blue, green, or red light in humans. C. the only photoreceptors which contain opsins. D. the only photoreceptors which contain rhodopsin. E. concentrated in the fovea and sensitive to colors.
Describe the fluxes of hormones in the female reproductive cycle, and the physiological consequences of those fluxes on the cycle.
What will be an ideal response?
Protein synthesis inhibitors have a low therapeutic index because they usually cannot discriminate between prokaryotic and eukaryotic ribosomes.
Answer the following statement true (T) or false (F)