1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
rewona [7]
3 years ago
8

How was bacteria first discovered?

Biology
1 answer:
matrenka [14]3 years ago
3 0

Bacteria were first observed by the Dutch microscopist Antonie van Leeuwenhoek in 1676

<u>-TheUnknownScientist</u>

You might be interested in
How does DNA in cells determine an organism? ’s complex traits?
hodyreva [135]
DNA<span> contains codes for proteins, which are necessary for the growth and functioning of an </span>organism<span>. </span>DNA<span> separates into long single strands that make up each part of an</span>organism<span>. </span>DNA<span> produces the energy an </span>organism<span> needs in order to grow. </span>DNA<span> folds into the nucleus of each of the </span>cells<span> of an </span>organism<span>.</span>
5 0
3 years ago
Describe both innate and acquired immune systems and the importance of vaccines.
lbvjy [14]

Answer:

Innate immunity is a non-specific immune system which provides defence against any pathogenic microorganism in early stages. It includes physical barrier such as skin, chemical barriers such as saliva, tears, et cetera, phagocytic cells such as macrophages, et cetera.

Acquired immune system is the one which develops after exposure to pathogen or antigen. It is highly specific in nature. It includes B-lymphocytes and T-lymphocytes. It includes the production of antibodies.

Vaccines are used to develop acquired immunity in people. The process is termed as vaccination or immunisation. Heat-killed or weakened pathogen or antigen is inserted into a person after which a person develops antibodies and memory cells against that pathogen or disease. So, the immune system acts more vigorously against that pathogen in secondary infection.

Thus, a person becomes immunised.

3 0
3 years ago
How does physical digestion take place in these parts of the human digestive system? Mouth or Stomach?
omeli [17]

Answer:

1-Mouth:the mechanical digestion takes place in mouth with the help of teeth. chewing is the machanical digestion of food in mouth.

2-Stomach: by the churning process. churning is the mixing of food in stomach by the movements of smooth muscles in stomach wall.

Explanation:

4 0
3 years ago
WILL MAKE THE BRAINLIEST      How often do Solar Eclipse on Earth? options: Once every century 2 to 7 times a year Once every 40
OLga [1]
Once every century hop I helped
5 0
3 years ago
Read 2 more answers
The unwinding of DNA at the replication fork causes twisting and strain in the DNA ahead of the fork, which is relieved by an en
Eddi Din [679]

Answer:

Topoisomerase

Explanation:

Topoisomerase is an enzyme that is involved in the unwinding of Deoxyribonucleic acid (DNA).  They are involved in double stranded DNA and they help to relieve the making of supercoils.

Topoisomerase play an important role during DNA replication, as the prevent the the twisting of the DNA double helix ahead of the replication fork. In other words, they ensure that the DNA open up for unwinding without being tightly wound.

8 0
3 years ago
Read 2 more answers
Other questions:
  • Consider the following reaction:
    12·1 answer
  • Question 5 what organisms have an open circulatory system? fish frogs mammals insects birds
    11·1 answer
  • Glaucoma is a leading cause of blindness. Studies have linked a common form of glaucoma to three genes and more than 20 genetic
    15·2 answers
  • how do you think plant cells differ from animal cells? (Hint: what can plants do that animals cannot?
    15·2 answers
  • What is turgor what causes it and what does it do for a plant
    13·2 answers
  • Warning coloration is an example of what kind of behavior?
    10·2 answers
  • The tails of the phospholipid bilayer face away from water because they are *
    14·1 answer
  • Describe how the artificial heart is different from a normal heart?
    8·1 answer
  • An energy pyramid is shown below. What does the energy pyramid demonstrate? A. The same amount of energy is available at every l
    6·2 answers
  • karen and her brother both have a straight hairline, but her parents and sister all have a widow’s peak. complete the punnett sq
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!