You have before you a living organism, which you examine carefully. Which of the following should convince you that the organism is acoelomate?

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#Question id: 28916

#Unit 4. Cell Communication and Cell Signaling

Which of the following hedgehog (Hh) proteins promotes spermatogenesis?

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#Question id: 28275

#Unit 5. Developmental Biology

 what will happened when sulfated polysaccharide binds to its receptor on the sperm____ 

a) activates CatSper calcium channel

b) activates sperm membrane calcium transport channel

c) activates sperm membrane sodium-hydrogen exchanger

d) activates sperm membrane phospholipase enzyme

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#Question id: 10992

#Unit 7. System Physiology – Animal

When recording lead aVL on an EKG, the positive electrode is the

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#Question id: 19735

#Unit 3. Fundamental Processes

In mammals, six telomeric proteins (TRF1, TRF2, Rap1, TIN2, TPP1, and POT1) comprises a complex which of the following is incorrect regrarding these telomeric protein

a) TRF1, TRF2, Rap1, binds to double stranded of DNA

b) TIN2 does not binds to DNA at all

c) POT1 binds to the GT tail extended by telomerase

d) TIN2 interacts with the two duplex telomeric DNA-binding proteins TRF1 and TRF2 as well as with TPP1

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#Question id: 30049

#Unit 7. System Physiology – Animal

Myocardial fibers are separated by membranes, but depolarization spreads radially (syncytium) because of the presence of: