Biology cell mcq

1. Who discovered cell in 1665?

a) Robert Hook

b) Robert Crook

c) David Thomson

d) Marie Francois

Ans. a)

2. Name an Organelle which serves as a primary packaging area for molecules that will be distributed throughout the cell?
a) Mitochondria

b) Plastids

c) Golgi apparatus

d) Vacuole

Ans. c)

3. Name the outer most boundary of the cell?

a) Plasma membrane

b) Cytoplasm

c) Nuclear membrane

d) None of the above

Ans. a)

4. Name the process in which the ingestion of material by the cells is done through the plasma membrane?

a) Egestion

b) Diffusion

c) Osmosis

d) Endocytosis

Ans. d)

5. Which among the following sentence is not correct about the organelles?
a) They are found in all Eukaryotic cells.

b) They are found in multicellular organisms.

c) They coordinate to produce the cell.

d) They are small sized and mostly internal.

Ans. b)
6. Name the process in which the passage of water goes from a region of higher concentration to a region of lower concentration through a semi permeable membrane?

a) Diffusion

b) Osmosis

c) Both a) and b)

d) Neither a) nor b)

Ans. b)

7. Name an organism which contains single chromosome and cell division occurs through fission or budding?

a) Eukaryotes

b) Prokaryotes

c) Bacteria

d) Primitive organism

Ans. b)

8. Name the process in which the membrane of a vesicle can fuse with the plasma membrane and extrude its contents to the surrounding medium?

a) Exocytosis

b) Endocytosis

c) Osmosis

d) Diffusion

Ans. a)

9. The jelly like substance present inside the cell is known as:

a) Cytoplasm

b) Ectoplasm

c) Nucleoplasm

d) None of the above

Ans. a)

10. Blue green Algae are:

a) Prokaryotes

b) Eukaryotes

c) Both a) and b)

d) Neither a) nor b)

Ans. a)

Earwax

                             Earwax


Why do we have Earwax and what is its function?

The earwax is very useful substance which keeps our ears healthy and is produced naturally in the ear. This wax is found not only in humans, but also in animals. It cleans, protects and lubricates the ears. Let us study through this article about earwax, its function etc.
Important facts about Earwax
1. The scientific name of the earwax is cerumen. It is formed in the outer part of our ear canal where there are thousands of glands. It is sticky and shiny substance. It coats the ear to moisturize it and fight against infection.
2. Earwax also prevents from dust, dirt, and insects from entering the ear.
3. It also works like a natural antibiotic, i.e. it contains anti-microbial properties. According to some researchers, cerumen contains a lysozyme antibacterial enzyme which is capable of destroying the walls of the cells of bacteria.
4. With the help of earwax, you can tell which family you belong to. People have wet or dry wax. Although, both the wax is made up of chemicals. But it depends upon the family that the wax will be wet or dry in your ear. This is detected by the gene. This gene is called ABCC11. If the gene G is replaced by gene A, then, the wax in the ear will be dry and its odour will also be different.

What is the function of Earwax in the Human Body?

Some people have dry or wet earwax. This wax is very useful and helps in keeping our ears healthy. It lubricates and protects the ear. This article deals with some important facts about earwax, its function etc.

Coronavirus

Coronaviruses (CoV) are a large family of viruses that cause illness ranging from the common cold to more severe diseases such as Middle East Respiratory Syndrome (MERS-CoV) and Severe Acute Respiratory Syndrome (SARS-CoV). A novel coronavirus (nCoV) is a new strain that has not been previously identified in humans.  

Coronaviruses are zoonotic, meaning they are transmitted between animals and people.  Detailed investigations found that SARS-CoV was transmitted from civet cats to humans and MERS-CoV from dromedary camels to humans. Several known coronaviruses are circulating in animals that have not yet infected humans. 

Common signs of infection include respiratory symptoms, fever, cough, shortness of breath and breathing difficulties. In more severe cases, infection can cause pneumonia, severe acute respiratory syndrome, kidney failure and even death. 

Standard recommendations to prevent infection spread include regular hand washing, covering mouth and nose when coughing and sneezing, thoroughly cooking meat and eggs. Avoid close contact with anyone showing symptoms of respiratory illness such as coughing and sneezing.