Which of the following statements is false about quorum sensing?
A) Quorum sensing allows bacteria to alter their protein synthesis in response to changes in population density.
B) Quorum sensing allows unicellular organisms to coordinate their processes.
C) Bacteria can communicate using chemical messengers called autoinducers.
D) Coordinated protein synthesis through quorum sensing is the foundation for forming biofilms.
E) Bacteria that experience quorum sensing have a decreased chance of survival.
Answer: E
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In a species of salamander, there are two forms, red and yellow. As the yellow form becomes less common due to predation and the red form more common, the yellow form becomes less likely to be eaten and more likely to survive and reproduce. The yellow form then becomes more common and roles of red and yellow forms reverse. This maintains both forms in the population. This would be an example of
A. negative frequency-dependent selection. B. directional selection. C. disruptive selection. D. balancing selection. E. negative frequency-dependent selection and balancing selection are correct.
Estuaries for many transient species are considered:
a. a place to spawn. b. nurseries. c. too full of predators for juveniles. d. very stable environments.
The five-toed limb of stem reptiles became
modified into a limb ____ in vertebrates that followed. a. suitable for high-speed running b. suitable for digging c. suitable for swimming d. with four fingers and an opposable thumb e. with all of these
Select the best process listed below for each statement numbered
125–129. Note that you need to know that the sequence of amino acids directly reflects the sequence of genes that coded for their placement. a. an inversion b. a deletion c. a gene duplication d. a translocation e. an addition D 125. Homologous sets of genes ABCDEF and aBCdEF are located on nonhomologous chromosomes. Crossing over between them is suppressed because their locations are the result of this. D 126. Homologous sets of genes ABCDEF and AEDCBF are located on homologous chromosomes. Crossing over between them is suppressed because of this. D 127. A small region of a protein from three species is sequenced and found to be as follows:species X is alanine, glycine, glycine, threonine, alanine species Y is alanine, glycine, threonine, alanine species Z is alanine, valine, glycine, threonine, alanine The difference in the amino acid sequence of species Y is most likely due to this. Chapter 12 Chromosomes and Human Inheritance 127 D 128. A small region of a protein from three species is sequenced and found to be as follows:species X is alanine, valine, threonine, alanine species Y is alanine, glycine, threonine, alanine species Z is alanine, valine, glycine, threonine, alanine The difference in the amino acid sequence of species Z is most likely due to this. D 129. The nucleotide sequences of homologous regions of DNA of two species are AATGCCCCGTTA and AATGCCCCGCTTA. If this is not the result of a nucleotide base-pair addition, then it is most likely the result of this.