A substrate binding to an enzyme is most similar to a signal molecule binding to a
A. receptor.
B. transcriptional factor.
C. second messenger.
D. G-protein.
E. kinase.
A. receptor.
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The dotted line in the figure above indicates ____
a. a polar covalent bond b. van der Waals forces c. an ionic bond d. a hydrogen bond e. a nonpolar covalent bond
What is most likely to occur when an individual is exposed to UV radiation?
A. The melanocytes will produce melanin, the melanin is distributed into epidermal cells, a steroid is converted into vitamin D and stem cells can mutate leading to cancer. B. The melanin will produce melanocytes, the melanocytes are then distributed into epidermal cells, a steroid is converted into vitamin D and stem cells can mutate leading to cancer. C. The melanocytes will produce melanin, the melanin is distributed into epidermal cells, vitamin D is converted into a steroid and stem cells can mutate leading to cancer. D. The melanocytes will produce melanin, the melanin is distributed into dermal cells, a steroid is converted into vitamin D and stem cells can mutate leading to cancer.
The observations of Hooke and van Leeuwenhoek documenting the existence of microscopic cells formed the basis of what important theory?
a. the germ theory of disease and causative agents b. the theory of spontaneous generation, which held that life forms could arise spontaneously c. the theory of chemotherapy, or use of antimicrobials to destroy pathogenic organisms d. the cell theory, stating that all living things are composed of cells
An endotoxin is associated with some
What will be an ideal response?