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BIOLOGY XII > cell cycle > Flashcards

cell cycle Flashcards

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1
Q

cytoskeleton is made of

A

microtubules and microfilaments

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2
Q

microtubules are composed of

A

tubulin protein

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3
Q

What is synthesized in G1 phase

A

Cell organelles(most)
proteins
RNA
nucleotides

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4
Q

What is synthesized in S phase

A

DNA
Centriole
Histone

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5
Q

What is synthesized in G2 phase

A

Tubulin(for spindle formation)
mitochondria
chloroplast
golgi complex

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6
Q

_______lasts more than 95% of cell cycle

A

Interphase

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7
Q

_________ cell stage may last up to months or years in oocytes of some vertebrates

A

Diplotene

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8
Q

synapsis forms in which stage

A

zygotene

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9
Q

Crossing over occurs in which stage

A

Pachytene

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10
Q

Dissolution of synaptonemal complex and chiasmata occurs in which stage

A

Diplotene

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11
Q

Terminalisation of chiasmata occurs in which stage

A

Diakinesis

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12
Q

Amino acids that are exception to degeneracy

A

Tryptophan

methionine

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13
Q

Activator for both RubisCO and PEP

A

Mg2+

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14
Q

Activator of Alcohol dehydrogenase

A

Zn+2

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15
Q

Activator of Nitrogenase

A

Mo

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16
Q

The INNER wall of guard cells are _____(thin/thick) and ______(elastic/rigid)

A

Inner wall of guard cells are __thick___ and ___elastic___

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17
Q

Outer walls of guard cells are ____(thick/thin)

A

Thin

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18
Q

Govt of India passed Environment protection Act in

A

1986

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19
Q

Air (Prevention and Control of Pollution)Act came into force in

A

1981

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20
Q

Air (Prevention and Control of Pollution)Act was amended to include noise as an air pollutant in the year

A

1987

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21
Q

In 1990s Delhi ranked ____ among the ___ most polluted cities in the world

A

In 1990s Delhi ranked __4th__ among the _41__ most polluted cities in the world

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22
Q

Euro III norms stipulate that sulphur be controlled at _____ppm in diesel and ___ppm in petrol

A

Euro III norms stipulate that sulphur be controlled at _350____ppm in diesel and _150__ppm in petrol

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23
Q

Euro III norms stipulate that aromatic hydrocarbons are to be contained at _______% of the concerned fuel

A

Euro III norms stipulate that aromatic hydrocarbons are to be contained at ___42____% of the concerned fuel

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24
Q

Goal of Euro III norms is to reduce sulphur to _______ppm in petrol and diesel and bring it down the level to _____%

A

Goal of Euro III norms is to reduce sulphur to __50_____ppm in petrol and diesel and bring it down the level to ___35__%

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25
Q

Biomagnification is well known for _____ and ______

A

Biomagnification is well known for __Mercury___ and __DDT____

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26
Q

DDT in water is

A

0.003ppb

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27
Q

DDT in zooplankton is

A

0.04ppm

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28
Q

DDT in small fish is

A

0.5ppm

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29
Q

DDT in Large fish is

A

2ppm

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30
Q

DDT in Fish eating birds is

A

25ppm

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31
Q

Vitamin B complex is fat soluble or insoluble?

A

Insoluble

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32
Q

Unequivocal proof of DNA as genetic material came from studies on a

A

Bacterial virus

33
Q

In Kranz anatomy the bundle sheath cells have ____walls,_______intercellular spaces, and ______chloroplasts

A

In Kranz anatomy the bundle sheath cells have _thick___walls,___NO____intercellular spaces, and _large number of _____chloroplasts

34
Q

Detrivores break detritus into smaller particles by process called

A

Fragmentation

35
Q

Leaching

A

water soluble inorganic nutrients go down into the soil horizon and get precipitated as unavailable salts

36
Q

Bacterial and fungal enzymes degrade detritus into simple inorganic substances in a process called

A

Catabolism

37
Q

Humification

A

Accumulation of dark amorphous substance called humus that is highly resistant to microbial action and decomposes at extremely slow rate

38
Q

Important steps in the process of decomposition are

A 
Fragmentation
Leaching
Catabolism
Humification
Mineralisation
39
Q

Common cold is not cured by antibiotics because

A

It is caused by a virus

40
Q

Pancreatic juice contains

A 
trypsinogen
chymotrypsinogen
procarboxypeptidases
amylases
lipases
nucleases
41
Q

Enterokinase role

A

secreted by intestinal mucosa that converts trypsinogen into active trypsin

42
Q

Bile is released into

A

dudodenum

43
Q

Bile contains

A

Pigments(bilurubin & bili-verdin)
cholesterol
phospholipids
NO ENZYMES

44
Q

Goblet cells location and function

A

Located in intestinal mucosa and secretes mucus

45
Q

Brunners gland location and function

A

Located in sub mucosa of intestine

helps maintain alakaline pH -7.8 in the intestine

46
Q

peptic or chief cells

A

+nt in stomach mucosa and secrete pepsinogen

47
Q

Parietal or oxyntic cells

A

+nt in mucosa of stomach and secretes HCl and intrinsic factor essential for absorption of Vitamin B12

48
Q

Simultaneous deficiency of proteins and calories

A

Marasmus

49
Q

Marasmus is found in children ___ than a yr in age and Kwashiorkar is seen in child _____than 1 yr in age

A

Marasmus is found in children _less__ than a yr in age and Kwashiorkar is seen in child __more___than 1 yr in age

50
Q

Unlike marasmus in Kwashiorkar

A

some fat is still left under the skin

51
Q

Tidal volume

A

500mL

52
Q

IRV

A

2500-3000mL

53
Q

ERV

A

1000-1100mL

54
Q

Residual volume

A

1100-1200mL

55
Q

pO2 in atmospheric air

A

159mmHg

56
Q

pCO2 in atmospheric air

A

0.3mmHg

57
Q

pO2 in Alveoli

A

104mmHg

58
Q

pO2 in deoxygenated blood

A

40mmHg

59
Q

pO2 in oxygenated blood

A

95mmHg

60
Q

pO2 in tissues

A

40mmHg

61
Q

pCO2 in Alveoli

A

40mmHg

62
Q

pCO2 in deoxygenated blood

A

45mmHg

63
Q

pCO2 in oxygenated blood

A

40mmHg

64
Q

pCO2 in tissues

A

45mmHg

65
Q

97% of O2 in our body is transported

A

RBCs in blood

66
Q

3%of O2 in our body is transported

A

in dissolved state thro plasma

67
Q

20-25% of CO2 in our body is transported

A

by RBCs

68
Q

70% of CO2 in our body is transported

A

as bicarbonates

69
Q

7% of CO2 in our body is transported

A

in dissolved state thro plasma

70
Q

CO2 carried by haemoglobin is called

A

carbamino-haemoglobin

71
Q

Every _____mL of deoxygenated blood delivers approx ____mL of CO2 to the alveoli

A

Every _100____mL of deoxygenated blood delivers approx _4___mL of CO2 to the alveoli

72
Q

Respiratory rhythm centre is present in

A

Medulla

73
Q

Pneumotaxic centre is +nt in

A

Pons

It can moderate the functions of the respiratory rhythm centre

74
Q

Role of O2 in regulation of respiratory rhythm centre is quite______(significant/insignificant)

A

insignificant

75
Q

Acidophils is _____% of TLC

A

2-3%

76
Q

Basophils is _____% of TLC

A

0.5-1%

77
Q

Neutrophils is _____% of TLC

A

60-65%

78
Q

Monocytes is _____% of TLC

A

6-8%

79
Q

Lymphocytes is _____% of TLC

A

20-25%

BIOLOGY XII (18 decks)

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