During which process do gametes fuse together?
A) embryonic development
B) fertilization
C) meiosis
D) mitosis
B
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In the disease myasthenia gravis, there is a deficiency of acetylcholine receptors at the neuromuscular junction. This blocks contraction by preventing muscle activation at which point?
A. generation of action potentials in the motor neuron B. opening of the T-tubule system C. release of Ca2+ from the sarcoplasmic reticulum D. altering the interaction of troponin with tropomyosin E. generation of action potentials in the muscle fiber
Answer the following statements true (T) or false (F)
1. Valley fever is another name for cryptococcosis. 2. The yeast form of Histoplasma capsulatum is quite distinctive because of its large capsule. 3. Both histoplasmosis and cryptococcosis may be acquired by inhalation of dried bat droppings (guano). 4. Molds in the genus Mucor are commonly referred to as bread molds. 5. If a patient is infected with a dimorphic fungus, it is likely that fungal hyphae would be seen in the infected tissues.
A gradual change in an organism, from an ancestral type, was referred to by Darwin as
A. an adaptation. B. descent with modification. C. convergent evolution. D. artificial selection. E. natural selection.
Hydrogen bonds are very important in the functional shape of:
A) proteins and nucleic acids. B) nucleic acids. C) sugars. D) proteins. E) fats.