Nseb

If a gene needs to be introduced in a plant, the expression vector has to be: 

(a) pBR322 

(b) Ti plasmid 

(c) λ phage 

(d) YAC

Though both starch and cellulose are composed of repeating glucose units, the main difference between them is that: 

(a) they are bonded by 1-6 and 1-4 glycosidic linkages respectively. 

(b) they differ in the α and  β configuration. 

(c) most of the fruits and grains are rich in starch and poor in cellulose or fiber. 

(d) starch is made of simple sugars while cellulose is made of amino sugars.

Some R-plasmids carry genes for resistance to many antibiotics. This occurs naturally due to: 

(a) transposons 

(b) transduction 

(c) transformation 

(d) transgenesis

Eastern and Western Meadow Larks look almost the same and inhabit the same areas of Prairie. They recognize mates of their own species by distinctive courtship songs: This is an example of type of pre-zygotic isolation. 

(a) Ecological 

(b) gametic 

(c) mechanical 

(d) behavioural

Which of the following animals has blood as circulating medium? 

(a) Cockroach 

(b) Mussel 

(c) Leech 

(d) Planaria

The X in the accompanying diagram is:

(a) amniotic egg 

(b) bipedal locomotion 

(c) diapsid skull 

(d) four chambered heart

Which ofthe following is a mismatched pair? 

(a) Lady’s finger – Capsule 

(b) Banana – Berry 

(c) Date – Drupe 

(d) Maize – Caryopsis

Four types of chemical messengers (Black Dots) released from the regulator cell (R) to the target cell (T) are depicted in I, II, III and IV

Match I, II, III and IV sequentially with (i) Steroid Hormone, (ii) Pheromones, (iii) Neurohormone iv) Neurotransmitter and choose the correct option. 

(a) iv, iii, ii, i 

(b) iv, iii, i, ii 

(c) i, ii, iii, iv 

(d) iii, iv, i, ii

Mark the correct option that shows highest to lowest % resorption of substances from nephron: 

(a) Water > Sodium > Urea 

(b) Glucose > Water > Urea 

(c) Water > Urea > Glucose 

(d) Urea > Glucose > Sodium

Filtration rate through kidneys is dependent on the filtration pressure. This in turn depends on the following three factors: 

l. Glomerular blood hydrostatic pressure 

II. Capsular hydrostatic pressure 

III. Blood colloid osmotic pressure 

The net filtration pressure will be:

(a) I+ II+ III 

(b) I – ( II + III) 

(c) (I+III)-II 

(d) II – (I + III)