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TLS Online TPP Program

#Question id: 5656

What is the cortical reaction, and why is it important?

#Unit 5. Developmental Biology

  1. The cortical reaction is the entry of Ca2+ ions into the egg, which initiates development.

  2. The cortical reaction is the exocytosis of the cortical granules during egg maturation, which contain the components of the zona pellucida.

  3. The cortical reaction is the depolarization of the plasma membrane after sperm entry, which helps to block polyspermy.

  4. The cortical reaction is the release of the cortical granules after sperm entry, which converts the vitelline membrane into the fertilization membrane which blocks polyspermy.

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TLS Online TPP Program

#Question id: 19200

#Unit 12. Applied Biology

What kind of biosensors uses ion-selective electrodes to convert the biological reaction into electronic signal?
TLS Online TPP Program

#Question id: 465

#Unit 1. Molecules and their Interaction Relevant to Biology

If the standard reduction potential of a certain half-reaction is -0.30 V, which statement below is true for this half-reaction to proceed as a reduction?
TLS Online TPP Program

#Question id: 20968

#Unit 12. Applied Biology

Transgenic models exist for ________ disease.
TLS Online TPP Program

#Question id: 384

#Unit 1. Molecules and their Interaction Relevant to Biology

A solution was prepared by dissolving 0.02 moles of acetic acid (HOAc; pKa = 4.8) in water to give 1 liter of solution. What is the pH? To this solution was then added 0.008 moles of concentrated sodium hydroxide (NaOH). What is the new pH? (In this problem, you may ignore changes in volume due to the addition of NaOH).
TLS Online TPP Program

#Question id: 23688

#Unit 13. Methods in Biology

Bacteria containing a plasmid into which the eukaryotic gene has integrated would grow in