Scientific Method
research
What is the first step in conducting a controlled experiment?
to control what goes into and out of the cell.
What is the function of the cell membrane?
sunlight, carbon dioxide, water, and enzyme
What raw materials are needed to carry out the process of photosynthesis?
During diffusion molecules move from high concentration to low concentration.
What occurs during the process of diffusion?
Glucose is small enough to move through the blood vessels. Starch must be digested, it is too big.
Why is glucose able to move through the small intestine into the bloodstream but starch cannot?
If children eat more fats and sugars, then they are more likely to be diabetic or have disorders.
State a testable hypothesis for the experiment below.
The American Academy of Pediatrics has noted an increase in the population of children with disorders that are usually associated with older adults, such as diabetes. Observers of American culture point to the trend to "super-size" food servings as a possible cause. Larger servings might encourage children of today to eat more fats and sugars than children ate a generation ago.
The nucleus sends instructions to the other organelles like the brain sends signals throughout the body telling it what to do.
Why is the nucleus of a cell similar to the brain of the body?
Chloroplast
Where does photosynthesis occur?
The size and charge of a molecule determines if they can move through the cell membrane.
What determines if molecules can move through a cell membrane?
to release waste, to maintain homeostasis, or to obtain nutrients and oxygen
What is a benefit to having a higher pulse rate (heart rate) after exercising?
You divide the highest number for the variable on the data table by the number of boxes for the axis.
How do you create an appropriate scale on an axis of a graph?
chloroplast and cell wall
What organelles are only found in plant cells?
Proteins that help chemical reactions occur faster.
What are enzymes?
salt solution
What substances can be added to an onion cell that will cause it to shrink?
60.75 or 61
What is the average of the following pulse rates: 64, 55, 74, 50?
If the experimental data is inconclusive, you should redo the experiment to gather more data, increase the trials, and amount of test subjects.
If your experiment was inconclusive, what should you do next?
The mitochondria releases ATP during cellular respiration for the cell to carryout cellular activities.
Why is the mitochondria the powerhouse of the cell?
The energy-rich molecule created during photosynthesis is glucose which is needed to release ATP during cellular respiration
How do organisms use the energy-rich molecule created during photosynthesis?
To determine the presence of starch, you must add starch indicator. If the solution turns blue-black, starch is present in the solution.
How do we determine the presence of starch in a solution?
Since their is 60 seconds in a minute, you will take the students 20 second pulse rate and multiply it by 3 to determine their pulse per minute.
If a student takes their pulse rate for 20 seconds, how do you determine their pulse per minute?
Using the class data provided, What is a valid conclusion that can be made about the effect of exercise on muscle performance?
Answers will vary.
The cell wall helps the plant cell maintain its shape during diffusion. This is why the cell never shrinks when salt is added to the cell.
Why does a plant cell never lose its shape when water diffuse into and out of the cell?
They work together to keep the body at homeostasis. During photosynthesis, glucose and oxygen are made to be used during the process of respiration to release energy for cellular activities. The other waste products, carbon dioxide and water ensure that the cycle can continue.
What is the relationship between photosynthesis and respiration?
Saline solutions helps the person bloodstream maintain a balance water content ensuring cells do not absorb too much water. Distilled water will create an environment where too much water is found in the blood. The water will want to diffuse into the cells to maintain homeostasis, causing cells to burst. This disrupts homeostasis.
Explain how the placement of distilled water in a person's IV instead of saline solution would be expected to upset the patient’s homeostasis.
The student squeezed the clothespin less the second time because waste products like lactic acid were building up in his cells.
Why did the student squeeze the clothespin during the second trial?