CSIR NET Weekend Booster Quiz 2024 | Life Science | 14 April

In haplontic life cycle

Which of the listed drugs below binds tightly to actin filaments and stabilize them against depolymerization?

Sound is perceived when

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?

The a₁, a₂, and a₃ are three alleles of a gene in Neurospora.
 
Crosses between different mutants gave the following results. Consider the following processes:
A) gene conversion
B) forward mutation
C) non-homologous recombination
D) incomplete dominance

The process which best explains this result is

Which one of the following drugs is obtained from the capsule of Papaver somniferum?

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

Research groups in a study found that loss of heat /unit body weight of a rabbit was greater than that of a bear. Although their body temperature was maintained at constant. What can be a possible reason?

Major histocompatibility complex (MHC) molecules are encoded by a cluster of genes called MHC locus. There are several reasons why an MHC molecule on the surface of a cell is important. Which one of the following reasons is INCORRECT?

The feather pattern of mallard ducks is determined by multiple alleles at a locus. One allele, M, produces the wild-type mallard pattern. A second allele, M^R, produces a different pattern called restricted, and a third allele, m^d, produces a pattern termed dusky. In this allelic series, restricted is dominant over mallard and dusky, and mallard is dominant over dusky: M^R >M > m^d. Estimate the number of genotypes and phenotypes produced?