Which is a component of the modern cell theory that was not part of the original cell theory? All organisms are made of cells. All cells are similar in composition and metabolic activities. All cells come from preexisting cells. A cell is the basic unit of structure and function for all living things.
Answers
All organisms are made of cells. All cells are similar in composition and metabolic activities. Thus, the correct option is A.
The first theory about cell was proposed by two German biologist Theodor Schleiden and Matthias Schwann in 1839.
What are the postulates of cell theory?
The main postulates of this theory are as follow:
1. Cell is the basic structural and functional unit of living organisms.
3. All living organisms are composed of cells.
3. New cells arise from already pre existing cells by division.
Modern cell theory is the new version of same cell theory. It also added that all cells are chemically similar in composition and metabolic activities. Cells contain hereditary materials and energy flow occurs with in cell.
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The correct option is that all cells are similar in composition and metabolic activities.
Explanation:
The first theory about cell was proposed by two German biologist Theodor Schleiden and Matthias Schwann in 1839.
Postulates:
The main postulates of this theory are as follow:
1. Cell is the basic structural and functional unit of living organisms.
3. All living organisms are composed of cells.
3. New cells arise from already pre existing cells by division.
Modern cell theory is the new version of same cell theory. It also added that all cells are chemically similar in composition and metabolic activities. Cells contain hereditary materials and energy flow occurs with in cell.
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"An experiment was performed to determine the role that ATP plays in kinesin movement along microtubules. Kinesin and microtubules were incubated together in a test tube, but instead of ATP, a non-hydrolyzable analog of ATP was added to the tube. What impact on kinesin function do you expect to observe in the presence of this ATP analog?"
Choose from the list the molecules necessary for every living thing on earth to survive. Select one or more: a. Lipids b. Carbohydrates c. Phosphate d. Nucleic Acids e. Proteins f. Oxygen ( :
Some problems with use of DNA analysis for forensic evidence may occur because ofidentical twins.not enough of a sample.contaminated samples.degraded samples.All of the above.
Answers
Answer:
0.0035 mL of oxygen per hour is metabolic rate at 20°C at cockroach.
Explanation:
- Metabolic rate of cockroaches at 15°C is 0.01 ml O2/h
- Metabolic rate of cockroaches at 25°C is 0.015 ml O2/hr
From the data we can see that metabolic rate of cockroach is in direct relation with temperature.
On graph, with metabolic rate on y-axis and temperature on x axis straight line will obtained , and the equation of the line can be determined by the help of point slope:
m = Slope of the line =
As per information given , :
x = temperature
y = metabolic rate
Now , put x = 20
y = 0.0035
0.0035 mL of oxygen per hour is metabolic rate at 20°C at cockroach.
Answers
Answer:
True.
Explanation:
Protein is a very versatile molecule and extremely important for the efficient functioning of the organism. However, proteins can only perform their functions through chains that wind and fold to form three-dimensional structures. these three-dimensional structures are the active form of the protein because they build the active site that will allow the substrate needed for body functions to fit and be catalyzed as needed.
In other words, the protein needs to be in its three-dimensional form for the construction of the active site to take place.
Answers
The nucleus is the site of transcription, production of messenger RNA (mRNA). Because of that, it contains a lot of proteins that either directly are involved in transcription or are involved in regulation. mRNA is exported from the nucleus, after being post-transcriptional modified.
Answers
Answer:
Water is Polar
Explanation:
There is no overall charge to a water molecule, but there is a slight positive charge on each hydrogen atom and slight negative charge on the oxygen atom.
B. start a chemical reaction
C. produce a catalyst
D. produce the reactants
Answers
Answer:
Option B is correct.
B. start a chemical reaction
Explanation:
Activation energy is the amount of energy that is needed to start a chemical reaction. To start a chemical reaction we have to provide this amount of energy. Different type of catalyst are used to lower the activation energy and catalyze the reaction.
Final answer:
Activation energy refers to the energy needed to initiate a chemical reaction, making 'B. start a chemical reaction', the correct answer to the question.
Explanation:
Activation energy is the amount of energy required to start a chemical reaction. It's the necessary energy to break the initial bonds of the reactants in a chemical reaction. Without adequate energy to pass this threshold, the reaction cannot proceed. For example, the energy required to start a fire (the reaction) is the heat from a match or lighter (activation energy). Once this energy threshold is surpassed, the reaction continues until the reactants are used up or another factor stops it. Hence, the correct answer to your question is B: start a chemical reaction.
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*prevent liquid from seeping between cells
Desmosomes
*act as rivets to hold adjacent cells together when epithelial tissue moves
Gap junctions
*allow movement of cytosol, ions, and small molecules between animal cells
Plasmodesmata
*openings through the cell walls of plant cells that allow adjacent cells to share materials
Answers
Answer:
Tight junctions - prevent liquid from seeping between cells
Desmosomes - act as rivets to hold adjacent cells together when epithelial tissue moves
Gap junctions - allow movement of cytosol, ions, and small molecules between animal cells
Plasmodesmata - openings through the cell walls of plant cells that allow adjacent cells to share materials
Explanation:
1) Tight junctions are one of the cell junctions found in animal cells. Tight junctions function to prevent the flow of liquid materials between cells.
2) Desmosomes are another type of cell junctions whose function is to form a connection between two adjacent cells. The structure formed by this connection confers strength upon the tissues involved.
3) Gap junctions are the most commonly found cell junctions found in animal cells that connects adjacent cells allowing the passage of cytosol, ions and other small molecules in them from one adjacent cell to another.
4) Plasmodesmata is a cell junction found in plant cells. They are small openings lying across the cell wall of plant cells whose function is to connect the cells and facilitate the movement of materials from one cell to another.
Final answer:
Tight junctions prevent liquid seepage between cells, desmosomes hold cells together, and gap junctions allow movement between animal cells.
Explanation:
- Tight junctionsprevent liquid from seeping between cells by forming a barrier that tightly seals adjacent cells together, preventing substances from passing through the spaces between cells.
- Desmosomes, on the other hand, act as rivets to hold adjacent cells together when epithelial tissue moves or is subjected to mechanical stress.
- Gap junctions, found in animal cells, allow the movement of cytosol, ions, and small molecules between cells, enabling communication and coordination.
- Plasmodesmata, found in plant cells, are openings through the cell walls that link adjacent cells and allow them to share materials, such as water, nutrients, and signaling molecules.
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