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FrozenT [24]
3 years ago
9

When we are born, we have about how many brain cells?

Biology
2 answers:
Reil [10]3 years ago
5 0
When babies are born, their brains contain about a hundred billion of neurons. However, a few of these brain cells are connected. At age three, there are one thousand trillion connections formed. The brain starts to cut off unused connections at the age of eleven. 
mafiozo [28]3 years ago
4 0

Answer:

The correct answer will be- 100 billion brain cells or neurons

Explanation:

The development of brain starts after three weeks of conception in the womb and the brain cells called neurons starts developing in the brain.

The brain usually develops about 100 billion neurons at the time of birth with very few synapses about 2500 synapse per neuron. In the first few years, the number of neurons increases to trillions and the formation of synapses begins and reaches about 15000 synapses per neuron at the age of five.

Thus, 100 billion brain cells or neurons is the correct answer.

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A person working in your lab creates a synthetic semi-fluid like substance embedded with proteins that transport nutrients and i
morpeh [17]

It is mostly likely the cell membrane.

The cell membrane is a structure of a cell composed of double layer of lipids and proteins. It surrounds a cell and separates the cytoplasm from its surrounding environment. The cell membrane is selectively permeable (semi-permeable), which means that it only lets certain molecules enter and exit. It can also control the amount of some substances that go into or out of the cell.  


7 0
2 years ago
Which event marks the beginning of DNA replication?
GrogVix [38]
DNA replication begins when something called Helicase (an enzyme) unwinds the helix structure of the DNA. It does this so that Primase can then come along and set down an RNA primer.
8 0
3 years ago
Read 2 more answers
Look at the blank with the number 15 in the passage. Which of these answers correctly completes the sentence?
Archy [21]

Answer:

b

Explanation:

its b because it doesnt say any else then 15 or any clues so its tryna trick u

6 0
2 years ago
Classify each picture as Carbohydrates or Lipids
stepan [7]

Answer:

1. Lipids

2. Carbohydrate

3. Lipids

4. Carbohydrate

5. Lipids

6. Lipids

7. Carbohydrate

Explanation:

Lipids and carbohydrates are two of the four major biological molecules (the other two being proteins and nucleic acids). They (lipids and carbohydrates) are both long chains composed of elements: carbon (C), hydrogen (H) and oxygen (O).

Lipids called triglycerides are majorly made up of building block fatty acids (long hydrocarbon chains with carboxylic acid) and glycerol ( an hydrocarbon made up of three hydroxyll groups).

Carbohydrates, on the other hand, are made up of long chains of carbon, hydrogen and oxygen with aldehyde or ketone functional group. They are composed of monosaccharide building blocks (also called simple sugars) with general formula CH20(n).

Based on the structural composition of lipids and carbohydrates, structures 1,3,5 and 6 are lipids while 2, 4 and 7 are carbohydrates.

3 0
3 years ago
PLEASE HELP!!!!
schepotkina [342]

I think its D. Mitosis is the division of a parent cell, producing 2 identical daughter cells whereas meiosis is the division of 2 germ cells, producing 4 non-identical gametes.

7 0
3 years ago
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