According to the biological species concept, for speciation to occur, _____
A) the number of chromosomes in the gene pool must change
B) changes to centromere location or chromosome size must occur within the gene pool
C) large numbers of genes that affect numerous phenotypic traits must change
D) at least one gene, affecting at least one phenotypic trait, must change
D
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The most toxic substances routinely found in the blood are metabolites of
a. carbohydrates. b. proteins. c. lipids. d. minerals. e. vitamins.
Which of the following is a unit of energy?
A) calorie B) bond C) watt D) mole E) both A and B
Modified leaves that protect meristematic tissue at the tips of woody plants are known as:
a. bulbs. b. bud scales. c. spines. d. tendrils. e. scale scars.
What does the rolling circle model of replication refer to?
a. transfer of plasmid DNA from one cell to another b. transfer of genomic DNA from one cell to another c. all bacterial DNA replication d. the multiple replication bubbles seen in prokaryotes