12830.A foreign DNA and plasmid cut by the same restriction endonuclease can be joined to form a recombinant plasmid using
ligase
Eco RI
Taq polymerase
polymerase III
Explanation:
Ligase are the enzymes used to join substrates. Here in case of DNA T4 DNA ligase is used.
Ligase are the enzymes used to join substrates. Here in case of DNA T4 DNA ligase is used.
12831.Which of the following is not a component of downstream processing?
Expression
Separation
Purification
Preservation
Explanation:
Expression of recombinant DNA is part of upstream processing.
Expression of recombinant DNA is part of upstream processing.
12832.Which of the following restriction enzymes produces blunt ends?
Hind III
Sal I
Eco RV
Xho I
Explanation:
Eco RV cuts DNA strands at the same position to provide blunt ends.
Eco RV cuts DNA strands at the same position to provide blunt ends.
12833.Which kind of therapy was given in 1990 to a four-year-old girl with adenosine deaminase (ADA) deficiency?
Radiation therapy
Gene therapy
Chemotherapy
Immunotherapy
12834.How many hot spots of biodiversity in the world have been identified till date by Norman Myers?
43
17
25
34
12835.The primary producers of the deep-sea hydrothermal vent ecosystem are
coral reefs
green algae
chemosynthetic bacteria
blue-green algae
Explanation:
Deep sea hydrothermal vents do not have oxygen for green algae, blue green algae and coral reefs. Further due to absence of light photosynthesis cannot occur.
Deep sea hydrothermal vents do not have oxygen for green algae, blue green algae and coral reefs. Further due to absence of light photosynthesis cannot occur.
12836.Which of the following is correct for r-selected species?
Small number of progeny with large size
Large number of progeny with small size
Large number of progeny with large size
Small number of progeny with small size
12837.If + sign is assigned to beneficial interaction, – sign to detrimental and 0 sign to neutral interaction, then the population interaction represented by + – refers to
parasitism
mutualism
amensalism
commensalism
Explanation:
Parasitism +, –
Mutualism +, +
Amensalism 0, –
Commensalism +, 0
Parasitism +, –
Mutualism +, +
Amensalism 0, –
Commensalism +, 0
12838.Which of the following is correctly matched?
Stratification-Population
Aerenchyma-Opuntia
Age pyramid-Biome
Parthenium hysterophorus-Threat to biodiversity
Explanation:
Parthenium hysterophorus – a rapidly growing weed which threatens biodiversity by not allowing the growth of other plants near it.
Parthenium hysterophorus – a rapidly growing weed which threatens biodiversity by not allowing the growth of other plants near it.
12839.Red List contains data or information on
marine vertebrates only
all economically important plants
plants whose products are in international trade
threatened species
Explanation:
Red list in the red data book published by IUCN (New name WCU) has information on threatened species of plants & animals.
Red list in the red data book published by IUCN (New name WCU) has information on threatened species of plants & animals.
12840.Which one of the following is wrong for fungi?
They are both unicellular and multicellular.
They are eukaryotic.
All fungi possess a purely cellulosic cell wall.
They are heterotrophic
Explanation:
In fungi, cell wall is usually composed of Chitin. Cellulosic cell wall is found in oomycetes of phycomycetes in fungi.
In fungi, cell wall is usually composed of Chitin. Cellulosic cell wall is found in oomycetes of phycomycetes in fungi.
12841.Methanogens belong to
Slime moulds
Eubacteria
Archaebacteria
Dinoflagellates
Explanation:
Biogas producing, obligate anaerobe, methanogens are type of Archaebacteria.
Biogas producing, obligate anaerobe, methanogens are type of Archaebacteria.
12842.Select the wrong statement.
Diatoms are microscopic and float passively in water.
The walls of diatoms are easily destructible.
Diatomaceous earth is formed by the cell walls of diatoms.
Diatoms are chief producers in the oceans.
Explanation:
The wall of diatoms contains cellulose & Silica. It is called frustule. It is non-degradable. After death, it is deposited at the bottom in water & form diatomous earth.
The wall of diatoms contains cellulose & Silica. It is called frustule. It is non-degradable. After death, it is deposited at the bottom in water & form diatomous earth.
12843.The label of a herbarium sheet does not carry information on
height of the plant
date of collection
name of collector
local names
12844.Conifers are adapted to tolerate extreme environmental conditions because of
presence of vessels
broad hardy leaves
superficial stomata
thick cuticle
Explanation:
Presence of thick cuticle, presence of sunken stomata and needle like leaves are xerophytic adaptations of conifers for tolerating extreme environmental conditions.
Presence of thick cuticle, presence of sunken stomata and needle like leaves are xerophytic adaptations of conifers for tolerating extreme environmental conditions.
12845.Which one of the following statements is wrong?
Laminaria and Sargassum are used as food.
Algae increase the level of dissolved oxygen in the immediate environment.
Algin is obtained from red algae, and carrageenan from brown algae.
Agar-agar is obtained from Gelidium and Gracilaria.
Explanation:
Algin is obtained from Laminaria & Fucus – Brown algae while Carrageenan from Chondrus crispes – Red alage.
Algin is obtained from Laminaria & Fucus – Brown algae while Carrageenan from Chondrus crispes – Red alage.
12846.The term polyadelphous is related to
calyx
gynoecium
androecium
corolla
Explanation:
If filaments of Androecium are joined to form more than two groups but their Anthers separate, it is called polyadelphous E.g. Citrus.
If filaments of Androecium are joined to form more than two groups but their Anthers separate, it is called polyadelphous E.g. Citrus.
12847.How many plants among Indigofera, Sesbania, Salvia, Allium, Aloe, mustard, groundnut, radish, gram and turnip have stamens with different lengths in their flowers?
Six
Three
Four
Five
Explanation:
Salvia, Mustard, Radish and turnip have stamens with different lengths in their flowers
Salvia, Mustard, Radish and turnip have stamens with different lengths in their flowers
12848.Radial symmetry is found in the flowers of
Cassia
Brassica
Trifolium
Pisum
Explanation:
Cassia, Trifolium & Pisum have zygomorphic flowers while Brassica has Actinomorphic flowers (Radial symmerty).
Cassia, Trifolium & Pisum have zygomorphic flowers while Brassica has Actinomorphic flowers (Radial symmerty).