Everyday Science – Cell Biology

Who was the first scientist to use an instrument for biological studies in 1665 ?

The first person to observe the bacteria,protozoa and spermatozoa under the microscope was.

Who invented the electron microscope ?

The theory that all animals and plants are made up of cells and they could arise only from pre-existing cells was propounded by.

The cell theory of Schleiden states that.

The smallest size of a cell,which can be seen directly by the eye is.

The use of which of the following devices has given the modern biologist a better insight into the internal structure of cells.

Cellular component can be physically separated from each other by.

Match list I with list II and select the correct answer using the codes given below the lists.
List(I)
(A) Cell Theory
(B) Theory of Natural Selection
(C) One gene on enzyme hypothesis
(D) Chemiosmotic hypothesis
List(II)
(I)P.Mitchell
(II) Beadle and Tatum
(III)Schleiden and Schwann
(IV) C.Darwin

The function of a cell wall is.

Plant cells can usually be distinguished because only plant cells possess.

Who first observed the plasma membrane ?

Cell membrane is.

What controls the entry and exit of molecules in a cell ?

The plasma membrane in animal cell is composed of.

The main function of plasma membrane is to.

The wonder pigment chlorophyll is present in.

The thin layer that forms a common layer for any two adjacent cells is.

Which of the protoplasm of a child is a physical basics of life.

The protoplasm of a child is exactly the same as that of its.

Quantosomes are present in.

The cytoplasm of a cell refers to.

Cell sap is.

Which of the following plays a on important part in photosynthesis ?

The powerhouse of a cell is the.

Within the cell,the site of respiration is the.

A mitochondria possesses a.

The electron transport chain is in the.

Endoplasmic reticulum is bound by.

Vacuoles are bound by a definite membrane in plant cells called.

A particular cell organelle is sometimes referred to as the suicide bag,because it contains certain enzymes (acid hydrolase)that can break down the cell components or even the whole cell. Which one of the following is such an organelle ?

Depending upon their structure and function lysosomes are categorized into.

Autophagy is the function of .

Lysosomes were discovered by.

Most plant and animal cells are similar in some respects since they both have in common.

In the plant cells,golgi complex is scattered in the cytoplasm in the form of small vesicles called.

A crosome in a sperm is secreted by.

The primary energy for living organisms is.

Granum is a component of .

Which one of the following is not a correct pairing of structure and function ?

Red pigment is found in.

The cell that lacks a nucleus is.

The cell that is concerned with excretion and osmoregulation is.

In human body,the longest cell is.

The cells that make up neurilemma nerve tissue are.

A prokaryote is.

Nuclear membrane is absent in.

Match the following (Q.48-Q.50)
(A) William Seifriz
(B) Flemming and Kollicker
(C) Camillo Golgi
(D) Porter Palade and Thomson
(1) Golgi bodies
(2) Endoplasmic reticulum
(3) Plasma membrane
(4) Mitochondria

(A) Louis Pasteur
(B) Walter Flemming
(C) Watson and Crick
(D) Christian Duve

(1) DNA
(2) Life begets life
(3) Lysosome
(4) Mitosis

(A) Purkinje
(B) Schleiden and Schwann
(C) Leuwenhoek
(D) Cinchona officinalis

(1) Cell theory
(2) Microscope
(3) Quinine
(4) Protoplasm

The protein synthesis takes place in .

Nucleus was first discovered by.

Nucleus was discovered by.

Meischer discovered.

Waldeyer gave the name.

Chromosomes are principally composed of.

DNA is found.

Chromosomes are concerned with.

The amount of DNA present in cell.

Haploid chromosome number is not seen in.

The DNA is a double helix was proposed by.

The DNA bases are.

Which of the following is not a constituent of DNA molecule ?

All of the following are constituents of RNA molecule,expect.

Dr.Khorana,s work relates to.

The division of nucleus is called.

The quality and number of chromosomes remain unchanged in.

The period between two divisions, that is the resting phase of a cell,is referred to as.

The process of the division of somatic cells of an organism is called.

Reverse transcription was first of all discovered by.

At which stage,mobilisation of materials takes place during mitosis ?

For a cell to divide,it is essential that its DNA is replicated so that each daughter cell gets an identical DNA. This replication occurs during .

All higher plants and animals, including man, were a single cell in their earliest life history.This cell.the gygote undergoes repeated divisions to produce all the body cells of the organism which are identical to start with. This process of division is called.

Mitosis actually means.

The body cells of both plants and animals divide mitotically to produce identical cells. The stage at which the chromosomes are aligned exactly in the middle of the spindle, each attached to the spindle fibres (microtubule) is called.

The spores formed by the zygospore of rhizopus is by.

In complex plants,the formation of spores takes place by.

The pairing of homologous chromosomes during prophase I of meiosis is called.

In meiotic prophase,the synapsis of chromosomes occurs at the stage of.

During which period of cell cycle does a centriole become a centrosome ?

The exchange of chromosomal segments between maternal and paternal chromatids during meiosis is known as.