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TLS Online TPP Program

#Question id: 28267

Resact binds to receptor on sperm, it activates guanylyl cyclase which causes the sperm cell to produce_______

#Unit 5. Developmental Biology
  1. more cGMP, that activates a calcium channel
  2.  activates a sodium channel in the cell membrane of the sperm tail, allowing the influx of sodium ions (Na2+).
  3. activates a calcium channel in the cell membrane of the sperm tail, allowing the efflux of calcium ions (Ca2+).
  4. activates a sodium channel in the cell membrane of the sperm tail, allowing the efflux of sodium ions (Na2+).
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TLS Online TPP Program

#Question id: 30106

#Unit 1. Molecules and their Interaction Relevant to Biology

If a cell has an adequate supply of adenine nucleotides but requires more guanine nucleotides for protein synthesis:

1. Glutamine-PRPP amidotransferase will not be fully inhibited.
2. AMP will be a feedback inhibitor of the condensation of IMP with aspartate.
3. ATP will stimulate the production of GMP from IMP.
4. ATP will inhibit nucleoside diphosphate reductase.
TLS Online TPP Program

#Question id: 5747

#Unit 8. Inheritance Biology

Mosaicism is due to
TLS Online TPP Program

#Question id: 1215

#Unit 4. Cell Communication and Cell Signaling

A cell responds to an external stimulus by increasing the intracellular Ca2+ concentration, releasing IP3 from the membrane, and producing salicylic acid. What kind of cell does this describe?
TLS Online TPP Program

#Question id: 5830

#Unit 8. Inheritance Biology

Base-pair additions and deletions are collectively referred to as ___ due to their changes in base-pair triplets.
TLS Online TPP Program

#Question id: 1909

#Unit 4. Cell Communication and Cell Signaling

Concerning MHC class II antigen differences between two individuals, which of the following is NOT TRUE?