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Cell membranes are composed mainly of

A. sugar and proteins

B. lipids and proteins

C. starch and lipids

D. sugar and lipids

Correct Answer :

B. lipids and proteins


Related Questions

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Cell theory was proposed by

A. M.J. Schleiden and Theodore Schwann in 1838 and 1839 respectively

B. M.J. Schleiden and Theodore Schwann in 1939 only

C. Theodore Schwann and M.J. Schleiden in 1938 only

D. T.J. Schleiden and M.J. Schwann in 1838 only.

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Ribosomes of plastids and mitochondria are

A. 55S to 70S

B. 80S

C. 40S

D. 60S

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Cells having large nuclei in proportion of cytoplasm are perhaps

A. dying

B. dehydrated

C. active

D. dividing

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 The function of cristae in a mitochondrion is

A. electron transport and ATP synthesis

B. carbon assimilation

C. intake of o2

D. elimination of co2

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There are 46 chromosomes in humans, of which

A. any 23 chromosomes are from father and remaining from the mother

B. the first 11 pairs and 'X' are from the father and next 11 pairs and 'Y' from the mother

C. the first 11 pairs and 'X' from mother and remaining from father

D. out of each pair one is received from the father and the other from the mother

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One of the following is a single-membraned structure:

A. Chloroplast

B. Nucleus

C. Mitochondria

D. Lysosome

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The cells were first seen microscopically by

A. Scheiden

B. Schwann

C. Leeuwenhock

D. Robert Hook

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Cell organelle which has electron transport system is

A. nucleus

B. centriole

C. nucleolus

D. mitochondria

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Electron microscope has revealed the presence of

A. ribosomes

B. chromosomes

C. chloroplast

D. leucoplast

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Physical basis of life is

A. nucleus

B. cell

C. protoplasm

D. nutrition

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Lysosomes were discovered by

A. Porter

B. DeDuve

C. Palade

D. Golgi

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Nitrogenous bases of RNA are

A. uracil and adenine

B. thymine and uracil

C. uracil, adenine, guanine and cytosine

D. thymine, adenine, guanine and cytosine

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Which structure performs a similar function in both plant and animal cell

A. Ribosomes

B. Contractile vacuoles

C. Chloroplasts

D. Cell wall

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Mitochondria were first observed in striated muscle cells by

A. Benda

B. Kolliker

C. Altmann

D. Robert Hooke

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One angstrom is equal to

A. 10-8cm

B. 10-8m

C. 10-6m

D. 10-7m

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In plant cell vacuole contains

A. water

B. cytoplasm

C. air

D. water and dissolved substance

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Janus-green-B is used for staining

A. ribosomes

B. chloroplast

C. mitochondrion

D. all of these

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"The substance of cells is living " was firs suggested by

A. Purkinje

B. Lamarck

C. Dutrochet

D. Dujardin

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The cell size is dependent upon

A. oxygen supply

B. nutrition

C. regulation by nucleus

D. all of die above

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Concept of unit membrane was given by

A. Danielli and Davson

B. Singer and Davson

C. Buvat

D. Robertson

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In centriole, microtubules are arranged in this order:

A. 9 + 2

B. 9 + 4

C. 9 + 0

D. 9 + 1

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Granal thylakoids occur in a

A. chloroplast

B. mitochondrion

C. microtubules

D. crista

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Intake of liquid food by formation of food vacuoles is called

A. pinocytocis

B. phagocytosis

C. absorption

D. imbibition

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The largest cell organelle is

A. nucleus

B. endoplasmic reticulum

C. chloroplast

D. mitochondria

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Cellular components can be physically separated from each other by

A. centrifugation

B. radioactive tracers

C. microscopy

D. chromatography

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Another name for ligase is

A. joining enzyme

B. RNA polymerase

C. nuclease

D. none of these

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Extranuclear DNA is found in

A. chloroplast

B. ribosomes

C. endoplasmatic reticulum

D. golgi apparatus

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Carbohydrate is synthesized from fat within

A. lysosome

B. spherosome

C. glyoxysome

D. lomasome

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According to cell theory

A. all cells have nuclei

B. all cells are living

C. cells, are fundamental units of all the living organisms

D. cells arise from pre-existing cells

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Sequence of nucleotides in a DNA strand is CAT TAG CAT CAT GAC, what will be the base sequence in complementary strand of RNA?

A. GUA AUC GUA GUA CUG

B. GTA ATC GAT GTA CTA

C. TAG ATG ATG GUA CUG

D. GTA ATG GTA GAT CTA