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TLS Online TPP Program

#Question id: 4907

Two corn plants are studied. One is resistant (R) and the other is susceptible (S) to a certain pathogenic fungus. The following crosses are made, with the results shown

R male X S female = all S progeny

R female X S male = all R progeny

Which of the following are correct about inheritance?

#Unit 8. Inheritance Biology

  1. Gene for that trait present in nucleus

  2. Trait follows bi-parental inheritance

  3. Resistance phenotype is dominant

  4. Gene for that trait present in mitochondria

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TLS Online TPP Program

#Question id: 19013

#Unit 13. Methods in Biology

Ion exchange chromatography is based on the_____________
TLS Online TPP Program

#Question id: 4296

#Unit 3. Fundamental Processes

 Normally, a stop codon is required to release the ribosome from an mRNA but what happens to a ribosome that initiates translation of an mRNA fragment that lacks a termination codon. The Ribosome stalled at broken part of mRNA. In prokaryotic cells, such stalled ribosomes are rescued by the action of a chimeric RNA molecule that is part tRNA and part mRNA, appropriately called a tmRNA. What is sequence of events of this rescue process.

A. Translocation of the peptidyl-SsrA RNA results in the release of the broken mRNA

B. the SsrAAla–EF-Tu–GTP complex binds to the A-site of the ribosome and participates in the peptidyl transferase reaction

C. portion of the SsrA RNA acts as an mRNA and encodes 10 codons followed by a stop codon

D. the protein encoded by the incomplete mRNA is fused to a 10-amino-acid “peptide tag” at its carboxyl terminus, and the ribosome is recycled. Interestingly, the 10-amino-acid tag is recognized by cellular proteases that rapidly degrade the tag and the truncated polypeptide to which it is attached
TLS Online TPP Program

#Question id: 18081

#Unit 8. Inheritance Biology

The interaction of selection and inbreeding in determining the incidence of autosomal recessive diseases. Consider a gene in which recessive mutations occur at a rate of 10-5. Assume a selective disadvantage S of 0.4 in homozygotes for the recessive allele. What is the frequency of the recessive allele (q). And calculate the incidence of the disease. Assume random mating.
TLS Online TPP Program

#Question id: 28468

#Unit 5. Developmental Biology

which factor is required to initiate first cell division in mice?
TLS Online TPP Program

#Question id: 28393

#Unit 5. Developmental Biology

The mechanism for this “bottom-up” specification of the frog embryo resides in a set of mRNAs that are tethered to the vegetal cortex. This includes the mRNA such as___