Which of the following represent repeated sequences commonly found in the human genome? (Choose all that apply)
A. several thousand base pair sequences in
tandem
B. several thousand base pair sequences
dispersed throughout the genome
C. two or three base pair sequences repeated
many times in a row
D. two or three pase pair sequences
dispersed throughout the genome
A,B,C
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Observe the photomicrograph on the right of an organism that was found growing symbiotically within the leaves of the water fern Azolla
(a) What is the common name given to an organism of this type? (b) Give the name and function of the cell depicted by the line.
Why was Haemophilus influenzae chosen by Craig Venter to test his whole-genome shotgun sequencing method?
What will be an ideal response?
In bog soils, the decomposition rate of lignin-cellulose complexes is accelerated by the water-logged, predominately anoxic conditions.
Answer the following statement true (T) or false (F)
A strain of penicillin-resistant N. gonorrhoeae that does not have a plasmid is isolated. A lysate made from the bacterium cannot degrade penicillin in an in vitro assay. When a culture of this strain is grown in a solution that contains radioactive penicillin, the amount of penicillin found within cells is less than the amount found within cells from a nonresistant strain. The DNA sequence of the porin gene from the resistant strain does not have any mutations. What is the most likely mechanism of resistance in this strain?
A) A mutation in the mtr gene has occurred, resulting in fewer efflux pumps. B) A penA nonsense mutation has occurred. C) A penA missense mutation has occurred. D) The bacterial genome carries the penr gene.