mcq biology

GATE XL 2016 Life Sciences Model Question Paper Zoology Optional Paper With Answer Key and Explanations Set 1 (MCQ 018)


GATE XL 2016 Life Sciences
ZOOLOGY Model Question Paper (MCQ 018)


GATE Life Sciences Sample Questions

(1). Which of the following taxa of Arthropoda possess prehensors?

a.       Trilobits
b.      Arachnidas
c.       Chilopodas
d.      Diplopodas

(2). In biological systematics the term ‘incertae sedis’ represents:

a.       An extinct taxa
b.      A fossil taxa
c.       A fossil specimen whose complete part is not yet characterized
d.      An enigmatic taxa

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biological chemistry

Artemisinin: A Wonder Phyto-drug Against Malarial Parasite: Plasmodium falciparum; & Nobel Prize Winning Contribution of Prof. Youyou Tu, China (Nobel Prize 2015: Physiology and Medicine)


Nobel Prize 2015 Physiology and Medicine

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Youyou Tu China Nobel Prize 2015 Physiology and Medicine

source: The Hindu

Artemisinin is an anti-malarial parasite drug extracted from a Chinese medicinal plant called sweet wormwood (Artemisia annua; Asteraceae family). It is also known as qinghaosu in Chinese and it is the most rapid acting drug currently available against the malarial parasite, Plasmodium falciparum.

The 2015 Nobel Prize in Physiology and Medicine is shared by William C. Campbell, Satoshi Omura and Youyou Tu for the discoveries of therapies against parasitic infections which saved millions of life over the globe. Among the three Nobel laureates, Professor Youyou Tu of China shares half of the Prize money for the credit of isolation, purification and structure elucidation of Artemisinin, the anti-malarial parasite drug for the first time from a Chinese traditional medicinal plant Artemisia annua. Professor Tu is the first China based Woman scientist to win the science Nobel.

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Zoology lecture notes and study materials

Phylum Arthropoda : General Characters


what are the general characters of phylum arthropoda

Arthropoda is a largest Phylum of Kingdom Animalia, includes about 80% of all known animal species in the biosphere including terrestrial and aquatic biomes. The phylum includes insects, crustaceous, centipedes, millipedes, spiders etc. The word Arthropoda is derived from two Greek words, ‘arthro’ = joint and ‘podo’ = foot. Phylum Arthropoda is characterized by:

@. Segmented body plan

@. Paired jointed appendages

@. Chitinaceous exoskeleton

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General characters of Phylum Arthropoda:

@. Cosmopolitan distribution

@. Presence of exoskeleton, made of chitin

@. Chitin= a structural homo-polysaccharide of N-acetylglucosamine linked by β-1, 4 glycosidic bond

@. Segmented appearance of body

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Free Net Life Science Study Materials

CSIR JRF NET Life Sciences December 2015 Examination Model Question Paper with Answer Key and Explanations Part 02 (Biology MCQ 017)


Biology MCQ 017


NET December 2015 Model Question

(1). Arabidopsis and rice have diploid chromosome number of 10 and 24, respectively. Assuming no crossing over taking place, genetic variation among F2 individuals in a genetic cross is likely to be:

a. Same in both species but not zero
b. More in Arabidopsis
c. More in rice
d. Zero in both the species

(2). In tryptophan operon, tryptophan acts as:

a. Repressor
b. Activator
c. Co-repressor
d. Co-activator

(3). Which of the following statement is CORRECT?

a. Plants adapted to cold environment have higher ratio of ‘unsaturated to saturated’ fatty acids in their membrane compared to those adapted to hot environment
b. Plants adapted to cold environment have lower ratio of ‘unsaturated to saturated’ fatty acids in their membrane compared to those adapted to hot environment
c. Plants adapted to cold environment have same ratio of ‘unsaturated to saturated fatty acids in their membrane compared to those adapted to hot environment
d. Plants do not have any unsaturated fatty acids in the membraneContinue reading