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blagie [28]
3 years ago
9

1. Which of these statements is not a part of the Cell Theory?

Physics
1 answer:
Dmitry_Shevchenko [17]3 years ago
6 0
1. C There are two main types of cells
Even though it's true that there are this 2 types of cells, this is not one of the following statements.
Statements in cell theory:
<span>-All living organisms are composed of one or more cells, although there is controversy about virus since they have a non-cellular.
-The cell is the basic unit of life and organization in organisms.<span>
- Cells always arise from pre-existing cells( spontaneous generation doesn't exist)

2. C  </span></span>Both Prokaryotes and Eukaryotes
Both types of cells need to have genetic information, otherwise it's not possible to transfer the information to the "daughter-cells" when replication happens. Also, it would be possible to synthesize proteins, necessary for cell's survival<span>

3. B- </span><span>Eukaryotes only

</span>Plants have the so called plant cells, which are a type of <span>eukaryotic cell.
</span>In plant cells we find a external wall composed by different kind of cellulose,  chloroplasts;  vacuoles, which don't exist in animal cells.
Other organelles such as the well define nucleus, mitochondria, endoplasmic reticulum, Golgi complex, lysosomes, cytosol are what it makes a eukaryotic cell.


4.B -Eukaryotes only
All living organisms except bacteria and Archaeas are eukaryotic, that includes  protists. Protists are a diverse group of organisms but they are primarily microscopic and unicellular, or made up of a single cell. Their cells are organized with a nucleus and organelles, making protist a group formed by eukaryotic cells.

5- B Eukaryotes only
All living organisms except bacteria and Archaeas are eukaryotic, that includes us humans. Trillions of cells are found in the human body and they are all eukaryotic because they have their genetic material (DNA) within the nucleus that is bound by a double membrane.

6- C <span>Both Prokaryotes and Eukaryotes
</span>The cytoplasm is the material within a cell, that means: the gel-like substance and the organelles.
All cells have a plasma membrane, cytoplasm, DNA, nucleus, mitochondria, endoplasmic reticulum, Golgi complex and lysosomes

7. B Eukaryotic cells only

Eukaryotic cells contain groups of proteins that function as a unit called organelles. An example of these organelles is the lysosome.
  It contains many enzymes that digest proteins, nucleic acids and lipids. It's important that they are not all over the cytosol because they would digest all of the other organelles, leading to cell death. The fact that they are bound to the membrane keeps them away from killing the cell.

8. C- Both Prokaryotes and Eukaryotes
Ribosomes are found in both prokaryotes and eukaryotes. They are not bound to the membrane; Ribosomes build protein based on the genetic information that the cell contains and that's a very important function for both types of cells.

9-  <span>B- Eukaryotes only

There are two main types of eukaryotic cells, the animal and the plant cells.
The name says it all, animals(including humans) have animal cells </span>
because they have their genetic material (DNA) within the nucleus,
<span>contain membrane-bound organelles, that carry out specific functions (like lysosomes) necessary for normal cellular operation.

10. B- </span>Eukaryotes only

The fungi group is formed by either unicelular( only one cell) or pluricellular (two or more cells) livings beings but they all are eukaryotes.
<span>Fungal cells contain a membrane-bound nuclei and other cytoplasmic organelles such as mitochondria, and ribosomes bound to the membrane.

11. A- </span>Prokaryote only<span>
Aside from bacteria and Archeaes, all the other groups are eukaryotes.
</span><span>While the eukaryotes have a well defined nucleus with all the DNA inside, the bacterias and archeaes have their genetic material all spread throughout the cytoplasm of the cell.

</span>12.B Eukaryotes only
This is  one of the differences in Eukaryotic cells and prokaryotes. While the eukaryotes have a well defined nucleus with all the DNA inside, the prokaryotes have their genetic material all  spread throughout the cytoplasm of the cell.


13. C - <span>Both Prokaryotes and Eukaryotes
</span>
The cell membrane( also called cytoplasmic membrane), is a biological membrane that separates the interior of a cell from the outside environment. It's formed by  a lipid bilayer with embedded proteins. This membrane chooses what comes inside the cell, and what comes out of it in prokaryotes and eukaryotes.







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Can anyone tell me how to read a micrometer screw gauge I want very clear instructions.
Natalka [10]

Explanation:

Things you need to know:

Accuracy refers to the maximum error encountered when a particular observation is made.

Error in measurement is normally one-half the magnitude of the smallest scale reading.

Because one has to align one end of the rule or device to the starting point of the measurement, the appropriate error is thus twice that of the smallest scale reading.

Error is usually expressed in at most 1 or 2 significant figures.

Tape

Equipment: It is made up of a long flexible tape and can measure objects or places up to 10 – 50 m in length. It has markings similar to that of the rigid rule. The smallest marking could be as small as 0.1 cm or could be as large as 0.5 cm or even 1 cm.

How to use: The zero-mark of the measuring tape is first aligned flat to one end of the object and the tape is stretched taut to the other end, the reading is taken where the other end of the object meets the tape.

Ruler

Equipment: It is made up of a long rigid piece of wood or steel and can measure objects up to 100 cm in length. The smallest marking is usually 0.1 cm.

How to use: The zero-end of the rule is first aligned flat with one end of the object and the reading is taken where the other end of the object meets the rule.

Vernier Caliper

Equipment: It is made up of a main scale and a vernier scale and can usually measure objects up to 15 cm in length. The smallest marking is usually 0.1 cm on the main scale.

It has:

a pair of external jaws to measure external diameters

a pair of internal jaws to measure internal diameters

a long rod to measure depths

How to use: The jaws are first closed to find any zero errors. The jaws are then opened to fit the object firmly and the reading is then taken.

Micrometer Screw Gauge

Equipment: It is made up of a main scale and a thimble scale and can measure objects up to 5 cm in length. The smallest marking is usually 1 mm on the main scale (sleeve) and 0.01 mm on the thimble scale (thimble). The thimble has a total of 50 markings representing 0.50 mm.

It has:

an anvil and a spindle to hold the object

a ratchet on the thimble for accurate tightening (prevent over-tightening)

How to use: The spindle is first closed on the anvil to find any zero errors ( use the ratchet for careful tightening). The spindle is then opened to fit the object firmly (use the ratchet for careful tightening) and the reading is then taken.

5 0
3 years ago
Using an unmanned rocket to visit the space station requires 85.2 trillion BTU of energy. The best fuel for the mission will hav
Illusion [34]
We shall convert all of the densities to lbs/gal, so the product of
BTU/lbs and lbs/gal gives us the basis of comparison, which was "ratio of energy to volume".
grams / ml x 1 lbs/454 grams → 1 lbs/ 454 ml
1 lbs/454 ml x 3785.41 ml/gal → 3785.41 lbs/454gal
Conversion of g/ml = 8.34 lbs/gal
Looking at each fuel:

Kerosene:
18,500 x (8.34 x 0.82) = 126,517 BTU/gal

Gasoline:
20,900 x (8.34 x 0.737) = 128,463 BTU/gal

Ethanol:
11,500 x (8.34 x 0.789) = 75,673 BTU/gal

Hydrogen:
61,000 x (8.34 x 0.071) = 36,120 BTU/gal

The best fuel in terms of energy to volume ratio is Gasoline.
Gallons required:
BTU needed / BTU per gallon
= 85.2 x 10⁹ / 128,463
= 6.6 x 10⁵ gallons
5 0
3 years ago
Two particles with oppositely signed charges nC are placed at two of the vertices of an equilateral triangle with side length 3
babymother [125]

The magnitude of the electric field at the third vertex of the triangle is determined as zero.

<h3>Electric field at the third vertex of the triangle </h3>

The electric field at the third vertex of the equilateral triangle due to the other charges placed on the first and second vertices is calculated as follows;

E = E(13) + E(23)

E = (kq₁)/r² + (kq₂)/r²

where;

  • q1 is positive charge
  • q2 is negative charge

E =  (kq₁)/r² - (kq₂)/r²

E = 0

Thus, the magnitude of the electric field at the third vertex of the triangle is determined as zero.

Learn more about electric field here: brainly.com/question/14372859

#SPJ1

5 0
2 years ago
What is the volume of a cube with length = 3 centimeters, width = 3
suter [353]

Answer:

D. 27 cubic centimeters

Explanation:

l*w*h

3*3*3= 27

4 0
3 years ago
The burning of a log releases the logs chemical_energy into other forms of energy
saul85 [17]

Answer:

When we burn wood we are releasing solar energy, in the form of heat, that has been stored in the wood as chemical energy. The process of photosynthesis converted solar energy, water and carbon dioxide into oxygen and the organic molecules that form the wood, half the weight of which is carbon.

Explanation:

7 0
3 years ago
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