BiologyQ51–53 of 97 questions
Page 2 of 2 · English
51
BiologyMediumMCQNEET · 2017
In bacteria,$DNA$ replication occurs in .........
A
During $S$-phase
B
Inside the nucleolus
C
Before cell division
D
Before transcription
Solution
(C) In bacteria (prokaryotes),$DNA$ replication is a continuous process that occurs in the cytoplasm. Unlike eukaryotes,bacteria do not have a distinct $S$-phase in their cell cycle. $DNA$ replication must be completed before the cell undergoes binary fission to ensure that each daughter cell receives a complete copy of the genome. Therefore,$DNA$ replication occurs before cell division.
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52
BiologyMediumMCQNEET · 2017
Identify the mismatched pair.
A
$Frankia - Alnus$
B
$Rhodospirillum - Mycorrhiza$
C
$Anabaena - Nitrogen fixer$
D
$Rhizobium - Alfalfa$
Solution
(B) $Frankia$ is a symbiotic nitrogen-fixing bacterium associated with the root nodules of non-leguminous plants like $Alnus$.
$Rhodospirillum$ is a free-living,anaerobic,nitrogen-fixing bacterium,whereas $Mycorrhiza$ is a symbiotic association between a fungus and the roots of higher plants. Thus,$Rhodospirillum - Mycorrhiza$ is a mismatched pair.
$Anabaena$ is a cyanobacterium known for nitrogen fixation.
$Rhizobium$ is a symbiotic nitrogen-fixing bacterium found in the root nodules of leguminous plants like $Alfalfa$.
$Rhodospirillum$ is a free-living,anaerobic,nitrogen-fixing bacterium,whereas $Mycorrhiza$ is a symbiotic association between a fungus and the roots of higher plants. Thus,$Rhodospirillum - Mycorrhiza$ is a mismatched pair.
$Anabaena$ is a cyanobacterium known for nitrogen fixation.
$Rhizobium$ is a symbiotic nitrogen-fixing bacterium found in the root nodules of leguminous plants like $Alfalfa$.
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53
BiologyEasyMCQNEET · 2017
Which of the following represents the order of a horse?
A
Equidae
B
Perissodactyla
C
Caballus
D
Ferus
Solution
(B) The biological classification of a horse $(Equus \ ferus \ caballus)$ is as follows:
$1$. Kingdom: Animalia
$2$. Phylum: Chordata
$3$. Class: Mammalia
$4$. Order: Perissodactyla (odd-toed ungulates)
$5$. Family: Equidae
$6$. Genus: Equus
Therefore,the order of the horse is Perissodactyla.
$1$. Kingdom: Animalia
$2$. Phylum: Chordata
$3$. Class: Mammalia
$4$. Order: Perissodactyla (odd-toed ungulates)
$5$. Family: Equidae
$6$. Genus: Equus
Therefore,the order of the horse is Perissodactyla.
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