Which of these components is/are not present in Gram negative bacteria?
Teichoic acid
Pseudomurein
Lipopolysaccharide
Mycolic acid
A.
Teichoic acid
B.
Pseudomurein
D.
Mycolic acid
Gram negative bacteria are a class of bacteria that do not retain crystal violet stain or Gram stain. They contain a thin peptidoglycan layer and outer membrane containing Lipopolysaccharides (LPS). Teichoic acids or lipoteichoic acids are absent. Pseudomurein is present in Archaebacteria when, it forms S-layer.
Mycolic acid is a component of cell wall of Actinomycetes and Gram positive bacteria.
Which of the following features is/are correct for heterochromatin of eukaryotic nucleus?
It is highly expanded in interphase
It stains densely with basic dyes
It is highly condensed in interphase
It stains densely with acidic dyes
Which of the followings is/are correct for the inheritance of genes involved in human 'ABO' blood grouping?
It is inherited by complete dominant allele
It is inherited by complete recessive allele
It is inherited by codominant allele
It is inherited by single gene with more than two alleles
Antelope cervicapra is
a mammal
commonly known as black back
an animal under data deficient category of wildlife
a threatened Indian wildlife
A set of genes will be in a complete linkage when the progeny phenotypes for parental (P) and recombinant (R) types are
P = 0%, R =100%
P = 50%, R = 50%
P < 50%, R > 50%
P = 100%, R = 0%
Which one of the following statements is wrong in relation to transgenic Bt cotton plant?
Crop yield loss due to the attack by Bacillus thuringiensis bacterium is reduced
Crop yield loss due to the attack by lepidopteran insect pests is reduced
The use of chemical insecticides in the cotton field is minimised
Better quality cotton is produced
Which one of the following natural polymers is found both in insects and fungi?
Pectin
Chitin
Cellulose
Suberin
Third stage larva of Wuchereria bancrofti carried by Gulex mosquito is called
cysticercus
merozoite
microfilariae
trophozoite
Persons suffering from sickle-cell anaemia normally do not suffer from
cholera
malaria
high blood pressure
hepatitis
Two related but geographically isolated species are known as
sibling species
sympatric species
taxonomic species
allopatric species