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Alik [6]
3 years ago
15

The results of experiments conducted by Louis Pasteur showed

Biology
2 answers:
const2013 [10]3 years ago
7 0

Answer:

<u>that all cells come from preexisting cells</u>

Explanation:

Louis Pasteur postulate that all living cells come from preexisting cells. Cells are the basic unit of life. All living things are made up of cells that formed through division of the preexisting cells. The scientist cultured cells in a lab. After few days, the mass of cells had increased greatly.

forsale [732]3 years ago
6 0

Answer: A) that all cells come from preexisting cells

Explanation: Apex

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A student designs an experiment to test substances X, Y, and Z, to determine which one is a catalyst for the reaction: A + B ® C
guapka [62]
The effect of a catalyst is to increase the speed of the reaction, this is the speed at which reactants, A and B, are consumed, ant the product, C, is produced.


Given that when C is produced the solution bubbles, the bubbles are an indication of progression of the reaction.


The greater the speed of reaction, the earlier the reaction will end and the earlier the bubbles will stop.   


So the student can identify the catalyst because the bubbles will stop first.


Answer: <span>The test tube that stops bubbling first contains the catalyst.</span>
3 0
3 years ago
Name and describe three groups of protozoans
monitta

Answer:

(1) Amoeboid protozoans or sarcodines

They are unicellular, jelly-like protozoa found in fresh or sea water and in moist soil.

(2) Flagellated protozoans or zooflagellates

They are free living, non-photosynthetic flagellates without a cell wall.

(3) Ciliated protozoans or ciliates

They are aquatic individuals that form a large group of protozoa.

Explanation:

hope this helps :}

7 0
3 years ago
Which of the following statements correctly describes some aspect of ATP hydrolysis being used to drive the active transport of
saw5 [17]

Answer:

B) This is an example of energy coupling

Explanation:

Energy coupling is a process by which cells carry out thermodynamically unfavorable, endergonic (energy-requiring) reactions to other exergonic (reactions that liberate free energy) reactions.

Reactions which are endergonic do not occur spontaneously as they result in a decrease in entropy and a positive free energy change, ∆G.

Exergonic reactions occur spontaneously as they result in an increase in entropy and have a negative free energy change, ∆G.

For example, the active transport of ions against their concentration gradients in cells is a non-spontaneous endergonic process which is coupled to the hydrolysis of ATP, an exergonic process in other for the reaction to proceed. ATP hydrolysis phosphorylates an amino acid side chain in the transport protein which then drives the forward process of transport of the ion.

Considering the above,

Option A: The hydrolysis of ATP is endergonic, and the active transport is exergonic is false because ATP hydrolysis is exergonic while active transport is endergonic.

Option B: This is an example of energy coupling is true.

Option C: Both ATP hydrolysis and active transport are spontaneous because they result in an increase in entropy of the system is false because only ATP hydrolysis is spontaneous

Option D: Neither ATP hydrolysis nor active transport is spontaneous is false because ATP hydrolysis is spontaneous.

Option E: ATP is acting as a transport protein to facilitate the movement of the ion across the plasma membrane is false because ATP is not a protein, rather it serves to activate the transport protein by phosphorylating it.

8 0
2 years ago
What is the goal of a conclusion?
kirill [66]

The goal of a conclusion is to state whether the hypothesis was supported by the data

Explanation:

A conclusion is a type of small paragraph where we explain the overall outcome of an experimental procedure and after it mention the proposed hypothesis at the starting of the experiment was correct or not.

These discussions which is mentioned in the conclusion is helpful for further experiments or also test that could be done to support your findings in the present experiment. This part could also be called perspectives.

4 0
3 years ago
Suppose the volume of milk in a glass is 230 cubic cm. If 1 gallon of milk equals 3.79 liters, there are how many glasses of mil
balu736 [363]
Volume of milk that a glass can hold = 230 cubic cm
It is already given that
1 gallon of milk = 3.79 liters
W already know
1 liter = 1000 cubic cm
Then
3.79 liters = 1000 * 3.79 cubic cm
                = 3790 cubic cm
Now
Number of glasses needed to contain 230 cm^3 of milk = 1
So
<span>Number of glasses needed to contain 3790 cm^3 of milk = 3790/230
</span>                                                                                           = 16.48
From the above deduction, we can conclude that 17 glasses of milk are required to hold 1 gallon of milk.
4 0
3 years ago
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