| all the components of the nodal tissue are autoexitable. why does the SA node act as the normal pacemaker | SA node has the highest rate of depolarisation |
| a specialized nodal tissue embedded in the lower corner of the right atrium, close to atrio-ventricular septum, delays the spreading of impulses to heart apex for about 0.1 sec. this delay allows | the atria to empty completely |
| DCT- | conditional reabsorption of sodium ion and water |
| PCT | reabsorption of ion, water and organic nutrients |
| descending limb of henle's loop | reabsorption of water only |
| ascending limb of loop of henle | reabsorption of salts only |
| which of the following receptors are specifically responsible for maintenance of balance of body and posture | crista ampullaris and macula |
| in the dicot root the vasuclar cambium originates from | tissue located below the phloem bundles and a portion of pericycle tissue above protoxylem |
| whorled phyllotaxy | alstonia |
| bicarpellary ovary with obliquely placed septum is seen in | solanum |
| most common type of embryo sac in angiosperms | monosporic with three sequential mitotic divisions |
| correct combination of saliant features of genetic code | degenerate, non-overlapping, non-ambiguous |
| which scientist experimentally proved that DNA is the sole genetic material in bacteriophage | hershey and chase |
| in the process of transcription in eukaryotes, the RNA polymerase I transcribes | rRNAs- 28 S, 18 S and 5.8 S |
| in which genetic condition, each cell in the affected person has 3 sex chromosomes XXY | kleinfelter's syndrome |
| prosthetic groups differ from co-enzymes in that | they (prosthetic groups) are tightly bound to apoenzymes |
| crossing over takes place between which chromatids and in which stage of the cell cycle | non-sister chromatids of homologous chromosomes at pachytene stage of prophase I |
| ramachandran plot is used to confirm the structure of | protiens |
| one scientist cultured cladophora in a suspension of azotobacter and illuminated the culture by splitting light through a prism. he observed that bacteria accumulated mainly in the region of | blue and red light |
| in order to increase the yield of sugarcane crop, which of the following plant growth regulators should be sprayed | gibberellins |
| in which one of the following, both autogamy and geitonogamy are prevented | maize |
| basal
axile
parietal
free central | dianthus
china rose
mustard
dianthus |
| a selectable marker is used to | help in eliminating the non-transformants, so that the transformants can be regenrated |
| western ghats have a large number of plant and animal species that are not found anywhere else. which of the following terms will you use to notify such species | endemic |
| in mung bean, resistance to yellow mosaic virus and powdery mildrew were brought about by | mutation breeding |
| an enzyme catalyzing the removal of nucleotides from ends of DNA is | exonuclease |
| in RNAi, the genes are silenced using | ds-RNA |
| which of the following glucose transporters in insulin-dependent | GLUT IV |
| what map unit (centimorgan) is adopted in the construction of genetic maps ? | a unit of distance between genes on chromosomes , representing 1 per cent cross over |
| select the hormone-releasing intra-uterine devices | progestasert, LNG-20 |
| expressed sequence tags (ESTs) refers to | genes expressed as RNA |
| the shorter and longer arms of a submetacentric chromosome are referred to as | p-arm and q-arm respectively |
| what is the site of perception of photoperiod necessary for induction of flowering in plants | leaves |
| xylem translocates | water, mineral salts, some organic nitrogen and hormones |
| which of the following muscular disorders is inherited | muscular dystrophy |
| the frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes was explained by | alfred strurtevant |
| placentation, in which ovules develop on the inner wall of the ovary or in peripheral part, is | parietal |
| varitations caused by mutation, as proposed by hugo de vries, are | random directionless |
| respiratiory quotient value of tripalmitin is | 0.7 |
| from evolutionary point of view, retention of the female gametophyte with developing young embryo on the parent sporophyte for some time, is first observed in | pteridophytes |
| concanavalin A is | a lectin |
| extrusion of second polar body from egg nucleus occurs | after entry of sperm but before fertilization |
| grass leaves curl inwards during very dry weather. why? | flaccidity of bulliform cells |
| cornea consists of dense matrix of collagen | and it is the most senesitive portion of the eye |
| phloem in gymnosperms lacks | both sieve tubes and companion cells |
| which combination of hormones can be applied to artificially induce flowering in pineapple plants throughout the year to increase yield | auxin and ethylene |
| i gene
z gene
a gene
y gene | repressor
beta-galactosidase
transacetylase
permease |
| sequence of organs in the alimentary canal of cockroach starting from mouth | pharynx--->oesophagus-->gizzard--->ileum--->crop--->colon--->rectum |
| how does steroid hormone influence the cellular activities | binding to DNA and forming a gene-hormone complex |
| which of the following is a commercial blood cholestrol lowering agent | statin |
| biocontrol agents | trichoderma, baculovirus, bacillus thuringiensis |
