Some components and breakdown products of commonly used pesticides are intercalating agents, which cause mutations by _____
1.their incorporation into the DNA molecule due to structural resemblance to bases
2.chemically modifying the bases in DNA
3.inserting themselves into the double helix of DNA and causing errors during replication
4.generating free radicals that produce mutations if they interact with DNA
3
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A(n) ____________ is a stony meteorite that contains no chondrules and no volatiles. They appear to have been melted after they formed and resemble solidified lavas
a. carbonaceous chondrite b. achondrite c. breccia d. Widmanstätten e. Kuiper belt object
Carriers for sickle-cell disease have a genetic advantage in some situations over those who do not have
any copies of the sickle-cell allele because carriers have
a. lower blood pressure. b. the ability to carry more oxygen in their blood. c. increased resistance to malaria. d. hyperactive immune systems. e. extra red blood cells.
Which growth model occurs when the amount of available resources is not limiting?
a. arithmetic growth b. logistic growth c. logarithmic growth d. exponential growth e. exponential growth and arithmetic growth
Which tRNA anticodon sequence is the correct match to the mRNA codon listed below? Note: codon-anticodon base-pairing is antiparallel. 5'-CGA-3'
A) 3'-CGA-5' B) 3'-TCG-5' C) 3'-GCT-5' D) 3'-GCU-5'