Answer: Cell wall; plant cells have a cellulosic cell wall, which is absent in the case of animal cells. The plasma membrane serves as the outermost boundary for an animal cell. Chloroplast: The presence of chloroplast enables photosynthesis in plant cells and it is absent in animal cells.
Explanation:
The respiratory system brings oxygen into the lungs when you breathe. The digestive system breaks food down into nutrients such as glucose. Now the circulatory system enters the picture. ... The circulatory system also transports carbon dioxide waste from the cells to the lungs of the respiratory system
Answer: Larger cells would become limited by the ability to move materials across the plasma membrane.
Explanation:
The larger size of the cell will not aid in the movement of particles across plasma membrane.
Larger size of the cell will disrupt the membrane integrity of the cell which will will not move the materials across plasma membrane.
The smaller particles are moved across the membrane by diffusion and larger molecules will require membrane transporters.
Hence. cells should not be larger in size.
Osteocytes are mature bone cells that maintain bone matrix and detect mechanical stress of new bone matrix. Osteoblasts synthesize and secrete osteoid (bone matrix). Osteoclasts are involved in bone resorption.
1. The answer is; B
This is because the soup has a higher temperature than the surrounding air. The heat will move from hotter object to the cooler object in search of thermal equilibrium. Heat transfer will only stop when the soup and the surrounding air have more or less the same temperatures.
2. The answer is; B
No mas is required because radiation (which are mainly electromagnetic waves) can transfer energy even through a vacuum. Other forms of energy transfer (such as convection and conduction)involve the transfer of vibrational motion from one molecule of matter to the next.
3. The answer is; D
The sun rays (which are electromagnetic waves that travel in photons) travel from the sun and through the vacuum of space before they reach the earth. When the photons hit the molecules that make up your skin, they energize them and cause them to vibrate more energetically. As they, differentially, lose this kinetic energy (when resuming a lower excitation state), this energy is expended as heat which you feel on your face.
4. The answer is; D
To start with, it is important to note that water is not a good conductor of heat. Therefore, as it is heated from below by the Bunsen burner, the water at the bottom of the glass gets warmer that than at the top of the glass. Warm water is less dense than cool water hence begin to rise while the cooler water from the top replaces the rising warm water. This process continues and forms convection currents until the water starts to boil.
5. The answer is; B
When the can is opened, it exposes the soup to the environment. This way the heat from the soup (due to thermal disequilibrium) transfers from the soup to the air. Because the soup is hotter, it loses heat energy to the surrounding as dictated by laws of thermodynamics.