Osteogenesis imperfecta is a rare human condition caused by a mutation in a gene encoding Type I collagen. In some forms of the disease, the mutation leads to the production of procollagen that has a defective extension sequence; this defect interferes with the assembly of functional collagen fibers. Which of the following symptoms would you expect to see in individuals with osteogenesis
imperfecta?
A. Very weak bones.
B. Defective kidneys and capillaries.
C. Thin discs between vertebrae.
D. Respiratory problems/lung defects.
E. Very strong tendons and ligaments/tight joints.
A. Very weak bones.
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The mode of transmission of A. denitrificans can best be described as:
a. person-to-person contact. b. exposure to contaminated water. c. contaminated fluids or medical solutions. d. close contact with animals.
Saltatory conduction is a term applied to the "jumping" movement of action potentials
A. across electrical synapses. B. along the postsynaptic membrane from dendrite to axon hillock. C. in two directions at the same time. D. from one neuron to another. E. along myelinated axons.
Which is false regarding passive transport?
a. It depends on concentration or electrical gradients. b. It involves weak binding between solute and protein. c. It requires an energy input. d. It depends on protein shape change. e. None of these are false.
Fungi are made of a network of thread-like substances called: