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TLS Online TPP Program

#Question id: 5662

Mouse sperm contain receptor proteins that bind to a glycoprotein (ZP3) in the zona pellucida of mouse eggs. Binding of ZP3 receptors to ZP3 initiates the sperm’s acrosomal reaction. All of the following experimental observations would be expected EXCEPT:

#Unit 5. Developmental Biology

  1. Injecting eggs with antibodies that bind to ZP3 blocks in vitro fertilization.

  2. Incubating sperm with purified ZP3 prior to mixing sperm and eggs blocks in vitro fertilization.

  3. Coating synthetic beads with a different glycoprotein, ZP2, fails to lead to sperm aggregation on the beads.

  4. Coating synthetic beads with ZP3 leads to sperm aggregation on the beads.

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TLS Online TPP Program

#Question id: 4058

#Unit 3. Fundamental Processes

The mechanism of pre-tRNA splicing differs in from the mechanisms used by self-splicing introns and spliceosomes as
TLS Online TPP Program

#Question id: 18889

#Unit 13. Methods in Biology

In light microscopy, which of the following is used as fixatives prior to staining technique?
TLS Online TPP Program

#Question id: 28834

#Unit 2. Cellular Organization

All microtubules are nucleated from structures known as____
TLS Online TPP Program

#Question id: 26866

#Unit 10. Ecological Principles

Secondary production is generally limited by
TLS Online TPP Program

#Question id: 1662

#Unit 4. Cell Communication and Cell Signaling

What is the approximate number of D segment genes in the immunoglobulin heavy chain gene locus?