Biology today

MTMTBIOLOGY TODAYBIOLOGY TODAY || MARCH ‘16MARCH ‘16 6969

77. 
    

    The restriction endonucleases are used in genetic
    engineering, because
    (a) they can cut DNA at specific base sequences
    (b) they are nucleases that cut DNA at variable sites
    (c) they can degrade harmful proteins
    (d) they can join different DNA fragments

    
    


78. 
    

C e-acceptor

D

LHC

Electron

transport

system

Light

ADP + Pi

AT P

NADPH

NADP+

H 2 O 2e–+2H++ [O]

A B

Which of the following is correctly labelled for the given
figure?
(a) A : PS II ; B : PS I ; C : e– acceptor; D: LHC
(b) A : LHC; B : e– acceptor; C : PS I; D : PS II
(c) A : PS I ; B : PS II ; C : e– acceptor; D : LHC
(d) A : e– acceptor; B : LHC; C : PS II; D : PS I

79. Consider the following statements with respect to
    respiration.
    A. Glycolysis occurs in the cytoplasm of the cell.
    B. Aerobic respiration takes place within the
    mitochondria.
    C. Electron transport system is present in the outer
    mitochondrial membrane.
    D. C 51 H 98 O 6 is the chemical formula of Tripalmitin, a
    fatty acid.

E. Respiratory quotient =

VolumeofOevolved

VolumeofCO consumed

2

(^2)
Of the above statements
(a) A, B and D alone are correct
(b) B, C and D alone are correct
(c) C, D and E alone are correct
(d) B, D and E alone are correct

80. Choose the wrong statement.
    (a) Lipases and nucleases are not present in pancreatic
    juice.
    (b) Goblet cells secrete mucus.
    (c) Brunner’s glands are sub-mucosal glands.
    (d) Carboxypeptidase catalyses conversion of proteins,
    peptones and proteoses to dipeptides.


81. For a plasmolysed cell which equation is correct?
    (a) DPD = OP + TP (b) DPD = –TP
    (c) DPD = OP (d) DPD = OP – TP.
    82. Cortisol is secreted by the adrenal cortex in response to
    stress. In addition to its function in a stress response, it
    functions in negative feedback by
    (a) inhibiting the hypothalamus so that corticotropin
    releasing hormone (CRH) secretion is reduced.
    (b) inhibiting the anterior pituitary’s ability to respond to
    CRH by reducing the pituitary’s sensitivity to CRH.
    (c) both (a) and (b) are correct.
    (d) none of these.
    83. Which of the following statement(s) regarding coelenterates
    is/are wrong?
    I. Cnidocytes are present on the tentacles and on the
    body.
    II. Diploblastic with cellular level of organization.
    III. Polyp forms are free swimming.
    IV. Exhibits metagenesis.
    V. Polyps produce medusae sexually and medusae form
    polyps asexually.
    (a) II and IV only
    (b) III and V only
    (c) I, II and III only
    (d) II, III and V only
    84. Which of these is/are wrongly matched?
    I. Alkaloid – Codeine
    II. Lectin – Morphine
    III. Toxin – Abrin
    IV. Terpene – Curcumin
    (a) I and II only (b) II and III only
    (c) II and IV only (d) IIIand IV only
    85. Match Column - I with Column - II and choose the correct
    option from below.
    Column - I Column - II
    A. Marginal placentation (i) Sunflower
    B. Axile placentation (ii) Mustard
    C. Parietal placentation (iii) Lemon
    D. Basal placentation (iv) Pea
    (a) A - (iv), B - (iii), C - (ii), D - (i)
    (b) A - (iv), B - (iii), C - (i), D - (ii)
    (c) A - (iv), B - (i), C - (ii), D - (iii)
    (d) A - (iii), B - (iv), C - (ii), D - (i)
    86. According to the modern concept of cellular membranes
    the structure of the cell membrane is as follows
    (a) there is a continuous lipid bilayer with interspersed
    proteins on the outside as well as some on the inside
    (b) there is a continuous lipid bilayer with continuous
    protein layer on the outside
    (c) there is a continuous lipid bilayer with continuous
    protein layer on the inside
    (d) both (b) and (c).