15760.Which of the following is considered an exception to cell theory?
Protists
Mycoplasma
Virus
Algae
15761.What is the common point of similarity between DNA and RNA?
Both are double stranded
Both have identical sugar molecules
Both have identical pyrimidine bases
Both are polymers of nucleotides
15762.Plasma membrane is made up of
Protein, lipid, carbohydrate
Lipid, carbohydrate
Protein, lipid
Protein
15763.Plasmodesmata are
Connections between adjacent cells
Lignified cemented layers between cells
Locomotary structures
Membranes connecting the nucleus with plasmalemma
15765.Which of the following statements are true about Eukaryotes?
(a) They are cells with a nucleus.
(b) They are found both in humans and multicellular organisms.
(c) Endoplasmic reticulum is present in Eukaryotes.
(d) They have chemically complexed cell wall.
(a) They are cells with a nucleus.
(b) They are found both in humans and multicellular organisms.
(c) Endoplasmic reticulum is present in Eukaryotes.
(d) They have chemically complexed cell wall.
(a), (b) and (c)
(a), (c) and (d)
(a), (b) and (d)
all are correct
15767.Keeping in view the "fluid mosaic model" for the structure of cell membrane, which one of the following statements is correct with respect to the movement of lipids and proteins from one lipid monolayer to the other (described as flip-flop movement)?
Neither lipids, nor proteins can flip-flop
Both lipids and proteins can flip-flop
While lipids can rarely flip-flop, proteins can not
While proteins can flip-flop, lipids can not
15769.Which one of the following pairs of nitrogenous bases of nucleic acids, is wrongly matched with the category mentioned against it?
Adenine, Thymine – Purines
Thymine, Uracil – Pyrimidines
Uracil, Cytosine – Pyrimidines
Guanine, Adenine – Purines
15770.The length of DNA molecule greatly exceeds the dimensions of the nucleus in eukaryotic cells. How is this DNA accommodated?
Through elimination of repetitive DNA
Deletion of non-essential genes
Super-coiling in nucleosomes
DNAse digestion
15771.Which one of the following does not differ in E.coli and Chlamydomonas?
Cell wall
Cell membrane
Ribosomes
Chromosomal organization
15773.Select the correct statement from the following regarding cell membrane
Lipids are arranged in a bilayer with polar heads towards the inner part.
Fluid mosaic model of cell membrane was proposed by Singer and Nicolson.
Na+ and K+ ions move across cell membrane by passive transport.
Proteins make up 60 to 70% of the cell membrane
15774.Assertion: Eukaryotic cells have the ability to adopt a variety of shapes and carry out directed movements.
Reason: There are three principal types of protein filaments-actin filament, microtubules and intermediate filaments, which constitute the cytoskeleton.
Reason: There are three principal types of protein filaments-actin filament, microtubules and intermediate filaments, which constitute the cytoskeleton.
Both assertion and reason are true and the reason is the correct explanation of the assertion.
Both assertion and reason are true but the reason is not the correct explanation of the assertion.
Assertion is true statement but reason is false.
Both assertion and reason are false.
15775.Comparing small and large cells, which statement is correct?
Small cells have a small surface area per volume ratio
Exchange rate of nutrients is fast with large cells
Small cells have a large surface area per volume ratio
Exchange rate of nutrients is slow with small cells
15776.In eubacteria, a cellular component that resembles eukaryotic cell is
Cell wall
Plasma membrane
Nucleus
Ribosomes
15777.What is true about ribosomes?
These are found only in eukaryotic cells
These are self-splicing introns of some RNAs.
The prokaryotic ribosomes are 80S, where "S" stands for sedimentation coefficient
These are composed of ribonucleic acid and proteins.
15778.E. Coli about to replicate was placed in a medium containing radio active thymidine for five minutes. Then it was made to replicate in a normal medium. Which of the following observation shall be correct?
Both the strands of DNA will be radio active
One strand radio active
Each strand half radio active
None is radio active
15779.A genophore (nucleoid) consists of
Histone and RNA
A single double stranded DNA
A single stranded DNA
Histone and non-histone