Multiple Choice QuestionsMunch hypothesis is based on
Translocation of food due to Turgor Pressure (TP) gradient and imbibition force
Translocation of food due to Turgor Pressure (TP) gradient
Translocation of food due to imbition force
None of the above
B.
Translocation of food due to Turgor Pressure (TP) gradient
Munch hypothesis is based on the movement of phloem sap along a turgor pressure gradient. The mass flow of organic solutes takes place from the site of higher concentration, (source) to the site of lower concentration (sink).
Thalassemia and sickle cell anemia are caused due to a problem in globin molecule synthesis. Select the correct statement
Both are due to a qualitative defect in globin
chain synthesis
Both are due to a quantitative defect in globin chain synthesis
Thalassemia is due to less synthesis of globin molecules
Thalassemia is due to less synthesis of globin molecules
C.
Thalassemia is due to less synthesis of globin molecules
Match the triplet codons listed in column I with their amino acids mentioned in column II and select the correct option from the given codes.
Column I Column II
A. GGG (i) Proline
B. UUU (ii) Glycine
C. CCC (iii) Arginine
D. AAA (iv) Phenylalanine
(v) Lysine
A-(v), B-(iii), C-(i), D-(ii)
A-(v), B-(iii), C-(i), D-(iv)
A-(ii), B-(iv), C-(i), D-(v)
A-(i), B-(ii), C-(iii),D-(iv)
C.
A-(ii), B-(iv), C-(i), D-(v)
hnRNA undergoes two additional processes. Out of them in one process an unusual nucleotide (methyl GPT) is added to the 5' end of the molecule. What would you call this?
Tailing
Splicing
Termination
Capping
D.
Capping
The process of addition of methyl GPT at the 5' end of hnRNA is known as capping. Enzyme guanly transferase catalyses this process.
Cap is essential for the formation of mRNA- Ribosome complex. Translation is not possible if cap is lacking, because cap is identified by 18 SrRNA of ribosome unity.
Which of the following DNA sequences qualifies to be designated as a palindrome?
5'-GACCAG'3 in one strand
3'GACCAG-5' in one strand
5-GACGAG-3', 3'-CIGGIC-5'
5'-AGCGCT-3', 3'-TCGCGA-5'
D.
5'-AGCGCT-3', 3'-TCGCGA-5'
The palindromic sequence is the sequence of nucleotides whose reading is same when read from both 5'→3' and '3→5' direction. It is the mirror image of the sequence in its first half.
Which of the following are not the functions of genes?
I. Cell division
II. Structure and metabolism control
III. Carrier of hereditary information
IV. Provide proof for crossing over
I, II, III and IV
I, III and IV
I, II and III
II, III and IV
C.
I, II and III
Gene fucntions are as follows:
(i) Genes are the units of inheritance
(ii) They control the morphology and physiology of individuals.
(iii) Their replication is essential for cell division.
(iv) Reshuffling of genes during sexual reproduction produces variations.
Assertion: The honeybee queen copulates only once in her life time.
Reason: The honeybee queen can lay fertilised as well as unfertilised eggs.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
B.
If both assertion and reason are true but reason is not the correct explanation of assertion.
Queen is the only fertile female in beehive, having immensely developed ovaries. She lives for several successive years laying about 2000 or more eggs a day. The queen has a remarkable capacity of controlling the fertilisation of its eggs. A fertilised egg is laid in a worker or queen cell, while an unfertilised egg in a drone cell, the latter develops parthenogenetically. The queen mates only once in her life time. The sperms stored in her spermatheca fertilise her eggs as long as she lives.
Read the following statements.
I. Satellite DNA is found in the region of euchromatin
II. Prokaryotes contain only non-repetitive DNA
Identify wheather the given statements are true or false
Both the statements are true
I is true and II is false
I is false and II is true
Both the statements are false
C.
I is false and II is true
Satellite DNA is a part of eukaryotic DNA that differs in density from most of its DNA as determined by centrifugation, that consists of short repetitive nucleotide sequences. It is found in the region of heterochromatin. It is the region of chromosomes that are permanently coiled up tightly and inert.
Variation in gene frequencies within a population can occur by chance rather than by natural selection. This is referred to as
Genetic flow
Genetic drift
Random mating
Genetic load
B.
Genetic drift
Variation in gene frequencies within populations can occur by chance and is called genetic drift.
Refer to the given figure and select the correct option regarding its parts labelled as A, B and C.
A-Histone octamer, C-DNA
B-H1 histone, C-Histone octamer
A-H1 histone, B-DNA
A-Histone octamer, C-H1 histone
B.
B-H1 histone, C-Histone octamer
The given figure shows nucleosome. Here A is DNA, B is H, histone and C is histone octamer.
