Which of the following statements is a reason for NOT classifying viruses in one of the three domains of life (Bacteria, Archaea, Eukarya) rather than in a fourth separate domain?
A) Some viruses can incorporate their genome into a host's genome.
B) Viruses direct anabolic pathways of host cells.
C) Viruses are obligate parasites.
D) Viruses are not composed of cells.
E) All of the answers are correct.
D
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Microevolution is ____
a. the appearance of a life form adapted to a new adaptive zone b. the formation of a new species c. the occurrence of a new mutation d. a change in allele frequencies within a population e. the gradual change in the form of fossils over geological time
What agricultural practice encourages the rapid
spread of plant diseases?
a. irrigation practices b. use of herbicide sprays c. genetic modification of crops d. planting large areas with a single variety e. use of pesticides
Which sentence below is correct:
a. Both transcription and translation start at the beginning of the gene. b. Transcription starts on the mRNA at a promoter and translation starts at the 5' end of the mRNA. c. Transcription starts at a promoter on the DNA and translation starts at the start codon on the DNA. d. Transcription starts at the promoter on the DNA and translation starts at the start codon on the mRNA.
Molecules of water stick to each other because:
A) covalent bonds form between the hydrogen atom of one molecule and the oxygen atom of another molecule. B) water molecules are nonpolar, and nonpolar molecules stick together. C) hydrogen bonds form between the hydrogen atom of one molecule and a hydrogen atom of another molecule. D) hydrogen bonds form between the hydrogen atom of one molecule and the oxygen atom of another molecule.