The only known risk factor for autosomal aneuploidy is _____
1.exposure to radiation
2.genetic predisposition
3.viral infection
4.toxoplasmosis
5.advanced maternal age
5
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Which of the following is the greatest threat to biodiversity?
A) overharvesting of commercially important species B) introduced species that compete with native species C) pollution of Earth's air, water, and soil D) disruption of trophic relationships as more and more prey species become extinct E) habitat alteration, fragmentation, and destruction
Which of the following statements is not true of resin?
A. Resins are produced by many species of conifers. B. Resins deter insects and fungi. C. Some pine resins can be boiled down to produce a sweet syrup. D. Many resins are distilled to produce turpentine and other solvents. E. Some conifer resins are used to produce chemotherapy agents.
The segregation principle states that in sexually reproducing diploid organisms the two copies of each gene
a. move together as a unit during meiosis. b. separate from each other during mitosis. c. will both wind up in either the sperm or egg. d. must always be the same allele. e. segregate from each other during meiosis.
A(n) ________ is a layer of protein or glycoprotein that exhibits a pattern resembling floor tiles.
Fill in the blank(s) with the appropriate word(s).