Loss-of-function mutations ________________________
(a) cause the production of proteins that are active in inappropriate circumstances.
(b) will usually show a phenotype when heterozygous.
(c) are only present in a population at barely detectable levels.
(d) are usually recessive.
(d)
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Laboratory diagnosis of HIV infection is usually made by which of the following?
A) electron microscopy B) growth of HIV in cell culture C) growth of HIV in embryonated chicken eggs D) immunodiagnostic procedures for the detection of antigen and antibodies
A(n) ________ is composed of tetrameric protofilaments.
A) extracellular matrix B) microtubule C) bacteriophage D) microfilament E) intermediate filament
The cell wall is a common feature to
_____ prokaryotic cells only. _____ plant cells only. _____ animal cells only. _____ prokaryotic and plant cells. _____ all cells.
Besides the ability of some cancer cells to overproliferate, what else could logically result in a tumor?
A) changes in the order of cell cycle stages B) lack of appropriate cell death C) inability to form spindles D) inability of chromosomes to meet at the metaphase plate