Practice Questions

TLS Online TPP Program

#Question id: 2060

An animal cell lacking carbohydrates on the external surface of its plasma membrane would likely be impaired in which function?

#I Life Science/ Life Sciences Group – I-V

transporting ions against an electrochemical gradient
cell-cell recognition
attaching the plasma membrane to the cytoskeleton
establishing a diffusion barrier to charged molecules

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TLS Online TPP Program

#Question id: 2974

#SCPH06 I Botany

Following statements are regarding to control of the G1–S phase transition in budding yeast.

A. G1 cyclin-CDK complexes stimulate the formation of G1/S phase cyclin-CDKs, which then initiate bud formation, centrosome duplication, and DNA replication. In yeast, the G1 cyclin gene is called CLN3.

B. Once sufficient Cln3 is synthesized from its mRNA, Cln3-CDK complexes phosphorylate and activate the transcriptional repressor Whi5.

C. Phosphorylation of Whi5 promotes its export out of the nucleus, allowing the transcription factor complex SBF to induce transcription of the G1/S phase cyclin genes CLN1 and CLN2 as well as other genes important for DNA replication.

D. Once produced, Cln1/2-CDKs contribute to further Whi5 phosphorylation. This positive feedback loop ensures the rapid accumulation of G1/S phase cyclin-CDKs.

Which of the following statements are correct?

TLS Online TPP Program

#Question id: 19124

#SCPH01 Biochemistry

Biosensor is a sensing device. It senses biomolecules by sensing

1. The interaction produces some detectable physical change that is measured and converted into an electrical signal

2. The interaction produces some detectable physical change that is measured and converted into ions.

3. B. The interaction produces some detectable physical change that is measured and converted into enzyme

Which of the following above statements are true for biosensor?

TLS Online TPP Program

#Question id: 10757

#I Life Science/ Life Sciences Group – I-V