Molecular Biology and Genetics MCQs

In eukaryotes, the ribosomal RNA genes are transcribed by

The repeat sequence of telomere in humans is

Match the terms in Group I with their associated functions in Group II. Group I Group II P. Shine-Dalgarno sequences 1. Aminoacylation of tRNA Q. Leucine zipper 2. Gene silencing R. Aminoacyl tRNA synthetase 3. Ribosome binding and facilitation of translation initiation S. RNA interference (RNAi) 4. Transcription factors

In nature, the horizontal gene transfer across bacteria is mediated by

In tomato plant, red (R) is dominant over yellow (r) for fruit color and purple (P) is dominant over green (p) for stem color. Fruit color and stem color assort independently. The number of progeny plants of different fruit/stem colors obtained from a mating are as follows: Red fruit, purple stem - 145 Red fruit, green stem - 184 Yellow fruit, purple stem - 66 Yellow fruit, green stem - 47 What are the genotypes of the parent plants in this mating?

Which one of the following covalent linkages exists between 7-Methyl guanosine (m7G) and mRNAs?

siRNA(s) interfere at

Determine the correctness or otherwise of the following Assertion (A) and the Reason (R). Assertion: Isopropylthiogalactoside (IPTG) is a gratuitous inducer of lactose operon. Reason: Gratuitous inducers are chemical analogs which behave like natural inducer but they do not serve as substrate for the enzymes that are subsequently synthesized.

Hypophosphatemia is manifested by an X-linked dominant allele. What proportion of the offspring from a normal male and an affected heterozygous female will manifest the disease?