The resting membrane potential of a typical neuron is –60 to –80 millivolts because
If 5- bromo- 2'- deoxyuridine (BrdU) is added to dividing cells it will be incorporated into the DNA of
The recombination frequency between gene p and gene q is 18%, between gene p and gene r is 8.4% and between gene q and gene r is 9.6%. Based on this information, the correct linear arrangement of these genes on the chromosome would be
Leeches belong to the phylum
Based on evidence from fossils, during which of the following geological periods did many of the animal phyla on earth first evolve ?
Birds are most closely related to
In animal cells, phospholipids are built on a backbone of
Which one of the following enzymes has proof- reading activity ?
Which one of the following is the correct expression for the function f(x) shown in the figure below ?
The following in infinite series represents
Eye colour in fruit flies is an X- linked trait specified by a single locus. The allele for red eye colour is dominant over that for white eye colour. If a white- eyed female fly is crossed with a red- eyed male fly, which of the following would be true of their progeny ?
The body sizes of individuals of a population of frogs on a remote island were measured and found to be normally distributed (Gaussian). After several years with severe winters, the mean body size was found to have significantly increased, although the distribution remained normal (Gaussian).
These results can be interpreted to mean that body size is under
The following bacterial DNA segment is transcribed in an in vitro reaction
5' ATGTGCGGTGCATAC 3'
3' TACACGCCACGTATG 5' (template strand)
The sequence of the RNA generated from this will be:
Which of the following statements on the similarity between bacterial lambda virus and human immunodeficiency virus (HIV) is NOT correct ?
Find the correct combination of the deficiencies in vitamins (lest column) with the defects that they are associated with (right column).
The enzyme that breaks down H2O2 into H2O and O2 in animal cells is usually found in which one of the following intracellular organelles ?
Which one of the following correctly represents the function f(X) = sin (2X) where X is angle in degrees ?
If f(x) = 4x2sin(2x) then its first derivative is
Which of the following correctly represents the relationship between values sin2(q) and cos2(q) ?
Which of the following DOES NOT happen in the loop of Henle of a nephron in the human kidney ?
The gametophyte phase of a plant is
The transcription of b- galactosidase in the lac operon is inhibited when a more efficient source of such as glucose is present in the medium. This happens because
Genetic relatedness in bacteria can be most reliably inferred by
Which of the following is a totipotent stem cell ?
Which one of the following is true for core and complex glycosylation of N- glycans occurring in animal cells ? (RER = Rough Endoplasmic Reticulum)
For a Ramachandran plot, which one of the following statements is true regarding the range of values for and ?
In the glycolytic pathway, cleavage of fructose I ,6- bisphosphate to two 3- carbon fragments is catalyzed by
The A and B antigens from the ABO blood group differ in
Fragments of which type of macromolecules are presented by MHC class 1 molecules ?
Which of the following is a true difference between Archaea and Bacteria ?
Vasopressin, released from the posterior pituitary, is responsible for
Males of a fish species react to other males of their species intruding into their territories with a characteristic headstand display. In an experiment, a male fish in an aquarium was shown a mirror, which provoked the headstand display. Non- reflective objects of the same shape and size, and water from other aquaria housing male fish of the same species in similar physiological condition failed to evoke a response. This experiment shows that
Gene rearrangements in which of the following cell types lead to antigen receptor diversity in immune cells ?
All mammalian tRNAs have
Which of the following are prezygotic isolating mechanisms between populations of sexually reproducing animals ?
Which of the following statements) about the electromagnetic spectrum is are true ?
Which of the following statement(s) is/are TRUE for oogenesis in humans ?
Which of the following are characteristics of receptors for lipid- soluble hormones ?
Acclimatization results from physiological adaptations. Which of the following happen(s) during acclimatization at high altitudes in humans ?
The root(s) of the equation x2 + 1 = 0 is/are
In a survey of 25 owners of dogs and/or cats, 20 owned dogs and 10 owned cats. The number of people who owned both dogs and cats was _____.
An opaque bag contains three balls, of red, blue and white colour, respectively. The balls are pulled out from the bag at random one after the other until the bag is empty. The probability that the red ball is picked before the white ball is _____. (Use decimal notation for your answer)
A linear 2- kb double- stranded DNA fragment contains two EcoRI restriction enzyme sites as shown in the figure.
After complete digestion with EcoRI, the products were resolved by agarose gel electrophoresis, followed by ethidium bromide staining. The number of bands visible would be _____.
A cube X, with each side of 2 cm length, is split into two new objects Y and Z. The plane of splitting is parallel to one of the faces of the cube. The value of the difference between the combined surface area or new objects Y and Z, and the surface area of X, in cm2 is ____.
Suppose that P, Q, R, S, T are the names of the only five different amino acids present in an organism. The number of kinds of tri- peptides that can be synthesized by this organism if repetition of amino acids is not allowed anywhere within any tri- peptide, is ______.
The area of the region bounded by the dashed line shown in the figure below in cm2 is _____.
Use π = 3.14.
The maximum number of molecules of ATP that can be generated by oxidative phosphorylation of one molecule of glucose is ______.
If P = 10 and Q = 4 then the value of 1 + P – Q (1 – e–x) when x = ∞ is _____.
In a simple food- chain, grass is eaten by deer, which are in turn eaten by tigers. If 1000 kJ energy is available in the grass, then the number of kJ of energy that can potentially reach the tigers is _______.
Consider two ligands A and B which can bind to receptor R either individually or simultaneously. The probability that A can bind to R is 0.10, and probability that B can bind to R is 0.20. The probability that both A and B can bind to R is 0.05. The probability that both A and B will NOT bind to R is ______
In a Mendelian cross, snapdragon plants with red flowers were crossed to snapdragon plants with white flowers. In the F1 generation, all the plants had pink flowers. When two plants from the F1 generation were crossed, 1000 F2 generation plants were produced. The number of F2 plants with red flowers was ______.
In the B form of DNA, the helical structure repeats every 34 Angstroms. Therefore, adjacent bases in the helix are separated by _______ Angstroms.
A single coin- tossing experiment has two possible outcomes, namely head and tail. Suppose three coins are tossed simultaneously, the probability of getting two heads and one tail is ______.
In an acid- base titration experiment with glycine, it was observed that 50% of its alpha- amino group was deprotonated at a pH of 2.34 while 50% of its carboxyl group was deprotonated at a pH of 9.6. The isoelectric point of glycine from the above information is ______.
A trait in a hypothetical diploid organism is inherited via a single gene with three different alleles.
The number of distinct genotypes possible in this system is _______.
Consider that the half- life of a radioactive element is 2 years. Suppose the total number of radioactive nuclei in year 2016 is N0, The number of radioactive nuclei will become N0/64 in the year _______.
Consider that doubling time of a bacterium is 20 minutes. If 2500 bacterial cells start dividing under ideal conditions, then the time taken in minutes to reach a population size of 40000 is _______.
if the concentration of Hydrogen ions in a solution is 10000 nM, then the pH of this solution is ______.
In a double reciprocal or Lineweaver- Burk plot for an enzymatic reaction, 1/[S] is plotted along the X- axis and 1/V is plotted along the Y- axis. Here [S] is the substrate concentration, 1/V is initial velocity, and Vmax is maximum velocity of the reaction. If the value of the slope is 1 per second and the value of the intercept on the X- axis is - 0.1 μM-1 then the value of Vmax in μMs-1 for this enzymatic reaction is ______.