Mouse cumulus cells also secrete a substance, CRISP1, that attracts sperm and hyperactivates them through CatSper channels

TLS Online TPP Program

#Id: 3659

#Unit 3. Fundamental Processes

Instead, a dedicated protein (a special elongation factor) named SELB in complex with GTP is required to deliver Sec–tRNASec to the ribosome.

TLS Online TPP Program

#Id: 3660

#Unit 3. Fundamental Processes

SELB ∙ GTP ∙ Sec–tRNASec reads the UGA codon as Sec rather than “Stop,” provided that the ribosomally bound mRNA has a hairpin loop on the 3′ side of the UGA specifying Sec.

TLS Online TPP Program

#Id: 3661

#Unit 3. Fundamental Processes

The gene can be restored to normal function if a second mutation either (1)converts the misplaced termination codon to a codon specifying an amino acid or (2) suppresses the effects of the termination codon, such restorative mutations are called nonsense suppressors.

TLS Online TPP Program

#Id: 3662

#Unit 3. Fundamental Processes

Pyl is specified by the codon UAG (normally a Stop codon).

TLS Online TPP Program

#Id: 3663

#Unit 3. Fundamental Processes

The Wobble Base of the Anticodon Determines the Number of Codons a tRNA Can Recognize.

TLS Online TPP Program

#Id: 3664

#Unit 3. Fundamental Processes

Ribosomes are large ribonucleoprotein particles that contain more RNA than protein and dissociate into large and small subunits.