CSIR NET Weekend Booster Quiz 2024 | Life Science | 28 April

An experiment was conducted in E. coli to map the following genes (pro, his, bio, met, phe and trp) on a circular map using three different Hfr strains:

* Strain 1, order of transfer (early to late) : trp met his pro

* Strain 2, order of transfer (early to late) : his met trp bio

* Strain 3. order of transfer (early to ,late) : pro phe bio trp

Based on the results, what is the most likely map?

Under a given renaturing condition E. coli DNA reassociates with a Cot ½ of 4.0 and an unknown DNA sample with a Cot ½ of 283. The complexity of this unknown DNA will be

In haplontic life cycle

Chorionic gonadotropin plays an important role in the establishment and maintenance of pregnancy and is synthesized in the placenta of

A normal couple has 5 children (2 daughters and 3 sons). Two sons suffer from a hereditary disorder but none of the daughters is affected. What is type of inheritance is depicted?

The nerve impulse at the neuromuscular junction results in discharge of acetylcholine (Ach) from its vesicles into the synaptic cleft. Ach gets degraded by acetylcholine esterase and is present in which one of the following locations?

A molecular biologist analysed 2 bacterial plasmids. Here first digested Plasmid A and Plasmid B with BamHI and analysed for agarose gel electrophoresis. If plasmid A gave two fragments and plasmid B gave three fragments, then which of the following inferences are correct?

P. Plasmid A has three sites and is circular

Q. Plasmid B has three sites and is circular

R. Plasmid A has two sites and is linear

S. Plasmid B has two sites and is linear

Seasonally breeding animals and birds measure the day length, i.e. photoperiod and use these measurements as predictive information to prepare themselves for breeding. Besides melatonin, which of the following hormones is involved in this biological process?

The human α-tropomyosin gene is alternatively spliced to produce several forms of α-tropomyosin mRNA in various cell types (Figure).
 
For all forms of the mRNA, the encoded protein sequence is the same for exons 1 and 10. Exons 2 and 3 are alternative exons used in different mRNAs, as are exons 7 and 8
 
Consider the following statements:
A) Exons 2 and 3 must have the same number of nucleotides.
B) Exons 2 and 3 must each contain an integral number of codons (that is, the number of nucleotides divided by 3 must be an integer).
C) Exons 2 and 3 must each contain a number of nucleotides that when divided by 3 leaves the same remainder (that is, 0, 1, or 2).

 
Which of the following statements about exons 2 and 3 is the most accurate?

Which of the following statement is true for Fasciola hepatica (liver fluke)?