The 16-kb mitochondrial genome encodes 13 proteins. How can there be more than 13 mitochondrially inherited conditions?
A) Some conditions are due to nuclear genes.
B) Many of the conditions are due to translation errors.
C) There are different kinds and numbers of mutations per gene.
D) Each parent may contribute different mutations.
E) Exon shuffling allows different polypeptides to form.
C
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The job of a natural killer cell is to:
A. release histamine. B. destroy invading pathogens through phagocytosis. C. destroy infected or abnormal host cells. D. trigger inflammation.
A plant with pink flowers is allowed to self-pollinate. Generation after generation, it produces pink flowers. This is an example of:
A. incomplete dominance. B. the law of independent assortment. C. true-breeding plant. D. interbreeding.
The event in the cell division process that clearly involves microfilaments is
a. chromosome separation during anaphase. b. movement of chromosomes to the metaphase plate. c. chromosome condensation during prophase. d. disappearance of the nuclear envelope during prophase. e. cytokinesis in animal cells.
What is the best definition of an organ?
A. A single type of tissue B. A type of glandular tissue C. Two or more tissues working together to perform a specific task D. Muscle tissue that has differentiated from stem cells E. A collection of cells and interstitial fluid