TLS Online TPP Program

#Question id: 4255


How might a single base substitution in the sequence of a gene affect the amino acid sequence of a protein encoded by the gene?

#Unit 3. Fundamental Processes
  1. Only a single amino acid could change, because the reading frame would be unaffected.

  2. The amino acid sequence would be substantially altered, because the reading frame would change with a single base substitution.

  3. All amino acids following the substitution would be affected, because the reading frame would be shifted.

  4. It is not possible for a single base substitution to affect protein structure, because each codon is three bases long.

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TLS Online TPP Program

#Question id: 11822

#Unit 6. System Physiology – Plant

The rate-limiting step in the Ethylene biosynthetic pathway is____

TLS Online TPP Program

#Question id: 11823

#Unit 6. System Physiology – Plant

_____A________the enzyme that catalyzes the conversion of AdoMet to ACC, while ___B_____ catalyzes the conversion of ACC to ethylene

TLS Online TPP Program

#Question id: 11824

#Unit 6. System Physiology – Plant

Only two of the ethylene receptors in Arabidopsis have intrinsic histidine kinase activity, these receptors are_______

TLS Online TPP Program

#Question id: 11825

#Unit 6. System Physiology – Plant

Ethylene receptors are localized into the______

TLS Online TPP Program

#Question id: 11826

#Unit 6. System Physiology – Plant

Some given statements about ethylene signalling pathways are listed;

a) Ethylene receptors are interact with two downstream signaling proteins, CTR1 (CONSTITUTIVE TRIPLE RESPONSE1) and EIN3 (ETHYLENE-INSENSITIVE3)

b) CTR1 is a soluble serine/threonine kinase that is associated with ethylene receptors, while EIN2 is an ER transmembrane protein with a cytosolic C-terminal domain that is a target for CTR1 kinase activity

c) EIN2 is required to stabilize transcription factors of the EIN3 (ETHYLENEINSENSITIVE3) family, which activate the transcription of ethylene-responsive genes

d) EIN3 is required to stabilize transcription factors of the EIN2 (ETHYLENEINSENSITIVE2) family, which activate the transcription of ethylene-responsive genes

Which of the following is the correct statements  of auxin signalling pathway ?

TLS Online TPP Program

#Question id: 11827

#Unit 6. System Physiology – Plant

Which of the following enzyme is involved in the rate-limiting step in ethylene biosynthesis?