Following statements are related to slow block to polyspermy in mammals.

A. A First slow block to polyspermy comes When the cortical granules fuse with the egg cell membrane, they release protein-digesting enzymes which is called as ovastacin that modify the zona pellucida proteins.

B. A second slow block to polyspermy comes from the so-called zinc spark, the release of billions of zinc ions that is induced by the entry of the first sperm, these released zinc ions are seen to bind to the egg cell membrane form a “zinc shield” that prevents further sperm entry.

C. A third slow block to polyspermy occurs at the level of the egg cell membrane and involves Juno.

Which of the following is incorrect?

TLS Online TPP Program

#Question id: 32314

#Unit 2. Cellular Organization

In cells expressing mutant versions of Sar1 or ARF that cannot hydrolyze GTP, what would be the result?

a. Vesicle coats do not form and vesicle buds pinch off.

b. The mutant proteins cannot trigger disassembly of the coat all available coat subunits eventually become permanently.

c. Unable to fuse with target membranes.

d. Blocking of coat disassembly.

TLS Online TPP Program

#Question id: 32315

#Unit 2. Cellular Organization

What triggers the release of the LDL particle from its receptor in the endosome?

TLS Online TPP Program

#Question id: 32316

#Unit 2. Cellular Organization

What phenomenon occurs when the rate of actin subunit addition is faster than nucleotide hydrolysis at the plus end but slower than nucleotide hydrolysis at the minus end?

TLS Online TPP Program

#Question id: 32317

#Unit 2. Cellular Organization

What type of interaction occurs between the β-propeller domain and the LDL-binding domain at low pH?

TLS Online TPP Program

#Question id: 32318

#Unit 1. Molecules and their Interaction Relevant to Biology

If fertilized, the egg is transformed from a single cell to a complex organism. Discuss this irreversible process in terms of the thermodynamic changes in the system as

TLS Online TPP Program

#Question id: 32319

#Unit 1. Molecules and their Interaction Relevant to Biology

The standard free-energy change for given reactions, using the equilibrium constants given for the reactions at 25 °C and pH 7.0, will be