The mammalian egg encounters a heterogeneous population of sperm. Some sperm have undergone the acrosome reaction in or near the cumulus, whereas others have not. The egg have pathways for accepting both types of capacitated sperm.

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#Id: 2411

#Unit 3. Fundamental Processes

Both polymerase removal and repair enzyme recruitment are performed by a single protein called TRCF.

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#Id: 3007

#Unit 3. Fundamental Processes

The lagging strand is synthesized discontinuously and the leading strand is synthesized continuously. This is called semidiscontinuous replication.

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#Id: 10058

#Unit 4. Cell Communication and Cell Signaling

Homophilic Binding 

A CAM on one cell can directly bind to the same kind of CAM on an adjacent cell

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#Id: 7105

#Unit 6. System Physiology – Plant

Inhibitors of ethylene synthesis

IN CASE OF TOMATOES:

pTOM5 encodes for phytoene synthase which promote  lycopene synthesis that gives red coloration

pTOM6 gene encodes for polygalacturonase. This enzyme  degrades the cell wall, resulting in fruit softening.

pTOM gene encodes for ACC oxidase. This enzyme  catalyzes the ethylene formation that triggers the fruit ripening.

Calgene introduced a gene in plant which synthesize a  complementary mRNA to PG gene and inhibiting the  synthesis of PG enzyme.

On May 21, 1994, the genetically engineered Flavr Savr tomato was introduced.

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#Id: 9098

#Unit 4. Cell Communication and Cell Signaling

Glycogen breakdown and synthesis is coordinately regulated by the second messengers Ca2+ and cAMP, whose levels are regulated by neural and hormonal stimulation, respectively