misc questions that are difficult Flashcards
The sporozoites that cause infection when a female Anopholes mosquito bites a human being are formed in
a) Liver of human
b) RBCs of mosquito
c) Salivary glands of mosquito
d) Intestine of mosquito
(d) Intestine of mosquito
Name the toxin responsible for causing the symptoms of malaria
Haemozoin
Antibody which is most effective in allergies
IgE
Name a vaccine produced by recombinant DNA technology
Hepatitis B vaccine
What causes shivering in a malaria patient?
When the RBC ruptures and releases the toxin haemozoin, it causes fever and chills
Name the malarial parasite that causes malignant malaria
Plasmodium falciparum
Differences between Humoral immunity and cell mediated immunity
- HI: Consists of B cells
CMI: Consists of T-cells - HI: Produced antibodies circulate in the body
CMI: Produce 4 types of T-cells - HI: Against viruses and bacteria
CMI: against all pathogens including fungi and protozoa, bacteria, viruses - HI: Doesn’t respond to transplants, cancer cells, extra-cellular microbes
CMI: Reacts against transplants, cancer cells, autoimmune disorders, intracellular microbes
In a DNA strand the nucleotides are linked together by
(a) glycosidic bonds
(b) phosphodiester bonds
(c) peptide bonds
(d) hydrogen bonds
(b) phosphodiester bonds
In E. coli the lac operon gets switched on when
(a) lactose is present and it binds to the repressor
(b) repressor binds to operator
(c) RNA polymerase binds to the operator
(d) lactose is present and it binds to RNA polymerase
(a) lactose is present and it binds to the repressor
The amino acid attaches to the tRNA at its
(a) 5’- end
(b) 3’ – end
(c) anticodon site
(d) DHU loop
(b) 3’ – end
In Miller’s experiment, the gaseous mixture in the flask contained:
(a) Methane, ammonia, carbon dioxide and helium
(b) Carbon dioxide, hydrogen, water vapour and ammonia
(c) Ammonia, methane, hydrogen and water vapour
(d) Hydrogen, ammonia and methane and helium
(a) Methane, ammonia, carbon dioxide and helium
Neo–Darwinism is:
(a) Natural selection theory
(b) Modern mutation theory
(c) Modern synthetic theory
(d) Population theory
(c) Modern synthetic theory
What is the effect of high pH on sperm?
(a) High activity leading to early death
(b) Sluggish, longer life
(c) High activity, longer life
(d) No effect
(c) High activity, longer life
Which of the following can be used as biofertilizer?
(a) Anabaena
(b) Nostoc
(c) Oscillatoria
(d) All the above
(d) All the above
The sperm of Drosophila contains _____ number of chromosomes:
(a) 4
(b) 46
(c) 23
(d) 8
(a) 4
difference between first trophic level of detritus food chain and grazing food chain
detritus food chain: decomposers form the first trophic level
grazing food chain: green plants form the first trophic level
grw All the primary productivity is not available to a herbivore
a considerable amount is utilised by the plants in respiration, while some is lost as heat into the environment.
what four features must a biomolecule have to act as genetic material
(i) It should be able to replicate.
(ii) It should be structurally and chemically stable.
(iii) It should be able to undergo slow mutations.
(iv) It should be able to express itself in the form of Mendelian characters.
A woman has certain queries as listed below, before starting with contraceptive pills. Answer them.
(a) What do contraceptive pills contain and how do they acts as contraceptive?
(b) What schedule should be followed for taking these pills?
(a) Contraceptive pills contain progesterone or estrogen or progesterone-estrogen combinations.
They functions as contraceptives by:
inhibiting ovulation
Inhibiting implantation
Altering the quality of the cervical mucus to prevent or stop the entry of sperms.
(b) The oral contraceptive pills are to be taken daily for 21 days, preferably within the first five days of the menstrual cycle.
List any four ways by which GMOs have been useful for enhanced crop output.
- Increased food production
- Resistant to extreme conditions like extreme cold,drought,heat stress
- Some crops are made pest resistant by genetic modification which cuts down the usage of pesticides
- Increased efficiency of mineral usage by plants and prevents early exhaustion of stability of soil
Write the situations as discovered by the ecologists when the value of ‘Z’ (slope of the line) lies between (i) 0.1 and 0.2 (ii) 0.6 and 1.2. What does ‘Z’ stand for?
(c) When would the slope of the line ‘b’ become steeper?
(i) for a small area
(ii) for a large area such as a continent
Z stands for slope of the line
It becomes steeper when wide areas such as continents are are considered for species-area relationships