Which of the following diseases are caused by an expansion of trinucleotide repeats?

A) cystic fibrosis
B) beta-thalassemia
C) achondroplasia
D) fragile X syndrome
E) Marfan's syndrome


Answer: D

Biology & Microbiology

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Collagen

A. forms junctions between cells. B. is part of a cell wall. C. must be secreted from a cell. D. functions inside a cell. E. acts as an enzyme.

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Answer the following statements true (T) or false (F)

1. Gamma aminobutyric acid (GABA) is the most common inhibitory neurotransmitter in vertebrates. 2. Ionotropic receptors act by activating G proteins in target cells. 3. Metabotropic receptors act by initiating changes in second messenger systems in target cells. 4. Meningitis is solely a bacterially caused disease. 5. Synaptic vesicles discharge their contents at the axon hillock region.

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The final product of glycolysis is ____

a. glucose b. fructose c. glyceraldehyde-3-phosphate d. pyruvate e. carbon dioxide

Biology & Microbiology