For a protein to be an integral membrane protein, it would have to be:

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#Question id: 7015

#Unit 5. Developmental Biology

During the specification of neural crest cells, the neural plate is bordered by neural crest anteriorly and caudally, and by placodal ectoderm anteriorly. If the ectodermal cells receive both BMP and Wnt for an extended period of time, they become

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#Question id: 10732

#Unit 10. Ecological Principles

A community plus the nonliving factors with which it interacts is called a(n)

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#Question id: 28653

#Unit 2. Cellular Organization

Which of the ubiquitin-protein ligases to allow loading of replicative helicases on DNA replication origin by degradation of geminin in metazoans?

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#Question id: 1030

#Unit 4. Cell Communication and Cell Signaling

The membranes of eukaryotes and mycoplasma

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#Question id: 15834

#Unit 8. Inheritance Biology

You are interested in a new type of autosomal dominant mutation that gives purple eyes in Drosophila. You have a true-breeding purple-eyed line carrying a mutation that you call pr-1. You have isolated a second purple-eyed mutation that you call pr-2, which you have established in a true-breeding line that also carries a recessive marker st, which gives stubby legs. You cross a fly from the pr-1 line to a fly from the st, pr-2 line producing F1 females which you then cross to males from a true breeding st line (normal eyes). From this cross, 1000 progeny flies can be categorized into four different phenotypic classes:

                             

Normally, 3-factor crosses give eight different phenotypic classes, why does this particular cross give only four?