In the experiment performed by Lederberg and Tatum bacteria of different genotypes had to be mixed together to obtain genetic transfer
However, Davis performed the experiment in a slightly different manner by separating cells with a filter incapable of allowing bacteria to pass. What possibility did the experiment by Davis exclude that could have occurred by the protocol used by Lederberg and Tatum?
A. transformation
B. conjugation
C. generalized transduction
D. specialized transduction
A
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Which of the following represents an early stage in
primary succession? a. pine trees b. moss and lichens on bare rock c. weedy annual plants in an open field d. climax species in succession e. alder, cottonwood, and willow thickets
What is the relationship between mobile genetic elements and DNA methylation?
A) DNA methylation is considered to be a defense against the spread of mobile genetic elements because it prevents transcription. B) DNA methylation is reduced in regions of the genome associated with mobile genetic elements because methylation only targets protein-coding genes. C) DNA methylation prevents RNA interference and therefore allows mobile genetic elements to spread. D) DNA methylation is a form of post-transcriptional silencing of mobile genetic elements.
Which of the following statements best describes how plants use hormones during signal transduction?
A. The hormone will bind to a specific receptor in the plasma membrane. It will then trigger a series of relay proteins that alter the signal into one that will impact the cellular machinery. Once the machinery is altered a change in gene expression will occur causing a change in the physical expression of the plant. B. The hormone will bind to a specific receptor in the plasma membrane. It will then trigger a series of relay proteins that alter the signal into one that will impact the cellular machinery. Once the machinery is altered a change in the physical expression will occur causing a change in the actual genes of the plant. C. The hormone will trigger a series of relay proteins to alter the signal into one that will impact the cellular machinery. Once the signal is changed the hormone will bind to a specific receptor in the plasma membrane. It will then cause a change in gene expression to occur causing a change in the physical expression of the plant. D. None of these describes how plants use hormones during signal transduction.
To which amino acid is nitric oxide added, altering the activity, turnover and/or interactions of proteins like hemoglobin, Ras, ryanodine channels and caspases?
a) methionine b) cysteine c) asparagine d) phenylalanine e) alanine