The questions below refer to the following evolutionary tree, in which the horizontal axis represents time (present time is on the far right) and the vertical axis represents morphological change.  Which species is most closely related to species W?

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#Question id: 15342

#XL - S Microbiology

The heavy chain is then expressed on the cell surface in combination with the surrogate light chain, which is made up of_______________, together they form the pre-B-cell receptor,

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#Question id: 15406

#XL - S Microbiology

Which method of gene transfer involves direct contact between the bacteria?

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#Question id: 15407

#XL - S Microbiology

The end result of F factor mediated conjugation:

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#Question id: 15408

#XL - S Microbiology

Which of the following is not a protein or group of proteins required for conjugation to occur?

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#Question id: 15409

#XL - S Microbiology

 A heterozygous trihybrid corn plant is testcrossed and the following progeny are produced (all traits are recessive to their wildtype alternative);

          booster                              6

          booster, silkless                  137       

          booster, liguleless, silkless      291

          liguleless                          142

          liguleless, silkless                  3

          silkless                            30

          booster, liguleless                  34

          wildtype                            339

What is the order of the loci on the chromosome? 

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#Question id: 15446

#XL - S Microbiology

Hyper IgM syndrome caused by mutation in?