Individuals with ____________________ are extremely sensitive to sunlight and develop skin cancer at a rate 1000 times above normal
Fill in the blank(s) with correct word
xeroderma pigmentosum
XP
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Which of the following events occurs initially when Escherichia coli cells are in a gradient of a chemorepellent?
A. Flagella rotate clockwise B. CheY is phorphorylated C. CheA autophosphorylates D. Cells tumble
Two bacterial genes are transduced simultaneously. What does this suggest about their proximity to each other within the original host genome?
A. Not a thing-it's highly likely that two separate virus particles were carrying each gene, and that they coinfected the new target cell at the same time, delivering their genetic payloads. This could mean the two original genes might not even be from the same original host cell! B. It's highly likely that the two genes are located next to each other in the original host cell chromosome. Since transduction relies on either mispackaging of bits of host cell DNA into non-functional virus units, or improper excision of lysogenic phage DNA from a host cell chromosome (carrying parts of the host cell DNA with it), the genes must lie close to each other to be transduced into a new cell simultaneously. C. They must be within five gene lengths of each other, but not necessarily immediately adjacent. If they were immediately adjacent, the transposons that facilitate the transfer of genetic information between the two cells wouldn't be able to 'jump' into them. D. It doesn't mean anything. Transduction relies on the ability of a cell to take up foreign DNA. It's possible here that the cell has simply taken up two separate bits of DNA at the same time from the surrounding environment.
Answer the following statement true (T) or false (F). Experiment 1 depends on recombination.
A researcher is studying the rII locus of phage T4. Three rII- strains are obtained: A, B, C, and D. In the first experiment, E. coli strain K(?) is coinfected with two rII- strains simultaneously and the results are recorded. Infection with A and B phage = plaques form Infection with A and C phage = plaques form Infection with B and C phage = no plaques form Infection with B and D phage = no plaques form Infection with C and D phage = no plaques form In a second experiment, coinfections are performed first in E. coli strain B, then the progeny phage are used to infect E. coli strain K(?). Progeny of A and B phage = plaques form Progeny of B and C phage = plaques form Progeny of C and D phage = plaques form Progeny of B and D phage = no plaques from
T or F: hematopoiesis takes place within the cortical bone
What will be an ideal response?