Multiple Choice QuestionsThe smooth endoplasmic reticulum is the major site for synthesis of
Protein
Lipid
Glycoproteins
Carbohydrates
Carbohydrates
Which of these is wrongly matched?
70 S ribosomes — Prokaryotes
80 S ribosomes — Eukaryotes
Axoneme — Cilia
Centromere — Centrosome
Centromere — Centrosome
D.
Centromere — Centrosome
Centromere is the point on a chromosome by which it is attached to a spindle fibre during all division, whereas, the centrosome is an organelle near the nucleus of a cell which contains the centrioles (in animal cells) and from which the spindle fibres develop in cell division.
In a polypeptide, amino acids are linked by
An ester bond
A hydrogen bond
A covalent bond
A glycosidic bond
A glycosidic bond
Which of the following is/are cellulosic?
(i) Paper
(ii) Cotton fibre
(iii) Chitin
(iv) Glycogen
(i) and (ii) only
(i) and (iii) only
(i), (iii) and (iv) only
(iii) and (iv) only
(iii) and (iv) only
Which of the following statements about amino acids is false?
Based on the nature of the carboxyl group there are many amino acids
Amino acids are substituted methane
Amino acids have an amino group and acidic group as substituent on the -carbon
There are four substituent groups occupying the four valency positions
There are four substituent groups occupying the four valency positions
Which of the following phases correspond to the interval between mitosis and initiation of DNA replication?
S phase
G1 phase
G2 phase
M phase
M phase
Which of these is not a key feature of meiosis?
Meiosis involves two sequential cycles of nuclear and cell division
Meiosis involves pairing of homologous chromosomes
Two cycles of DNA replication occur during meiosis
Three is recombination between the paired homologous chromosomes
Three is recombination between the paired homologous chromosomes
When a molecule moves across a membrane independent of other molecules the process is called
(i) Uniport
(ii) Symport
(iii) Antiport
(i) only
(i) and (ii) only
(i) and (iii) only
(ii) and (iii) only
(ii) and (iii) only
Apopalstic movement of water occurs exclusively through the
(i) Intercelluar spaces
(ii) Walls of the cells
(iii) Plasmodesmata
(iv) Cytoplasm
(i), (ii) and (iv) only
(iii) and (iv) only
(i) and (ii) only
(ii) and (iv) only
(ii) and (iv) only
Which of the following is not a role played by potassium in plant growth?
Translocation of carbohydrates
Maintaining anion-cation balance
Opening and closing of stomata
Synthesis of protein
Synthesis of protein
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