Lecture Activity #3 & 4 _____________________________________________________________________________

1. Indicate the chemical reaction for aerobic cellular respiration. __________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

2. Indicate if the following statements are true or false.

__________ a. Energy is used to move ions and molecules across

membranes in your nerves and kidneys.

__________ b. You do not use any energy when you sleep.

__________ c. Some of the energy used to construct molecules is

stored within them.

__________ d. ATP is short for adenosine diphosphate.

__________ e. ADP contains less energy than ATP.

Complete the following with the words or phrases below.

ATP energy heat membranes

blood enzymes homeostasis movement

build excess water kidneys nerve cells

cell organelles excretion light warm-blooded

3. Cells use energy to maintain _________________________.

4. Chemical changes always involve _________________________.

5. Regulation of the rate of biochemical reactions within cells is

accomplished by _________________________.

6. Indicate the chemical reaction for photosynthesis.

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7. Identify the organelle in which photosynthesis occurs. Explain the

function of the different part of this organelle.

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8. Where does the plant get the necessary chemicals of carbon dioxide

and water required for photosynthesis?

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9. Explain how photosynthesis and aerobic cellular respiration are related

to each other in terms of reactants, products and purpose.

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10. Forty bean seeds were planted in 40 different pots containing soil of the same composition and moisture level. All seeds were of the same age and species. The pots were divided into four groups of 10, and each group was kept at a different temperature (5 C, 10 C, 15 C, and 20 C respectively), for a period of 30 days. All other environmental conditions were kept constant.

State a problem being investigated in this experimental setup.

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#3

Factors Affecting Photosynthesis

The rate at which photosynthesis occurs is not always the same. The amount of light, the level of temperature, the supply of carbon dioxide, the supply of water, and the availability of minerals are important factors that affect the rate of photosynthesis in land plants. The rate also varies by the species and its health and maturity.

 

The two graphs below show the effects of light intensity and temperature on the rate of photosynthesis in land plants. These two factors affect many enzymes that control photosynthetic reactions. (Light intensity is measured in lumens, the SI unit of light flow.) Study the graphs and answer the questions below.

 

 

 

 

 

 

 

 

 

 

 

 

 

1. What does Graph 1 tell about the effect of light intensity on the rate of

photosynthesis?

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2. What happens when the light intensity rises above 9000 lumens?

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3. What does Graph 2 show about the effect of temperature on the rate of

photosynthesis?

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4. What happens when the temperature rises past 33C?

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5. Identify the light intensity and temperature levels which allow the

best photosynthesis rate, based on the graphs?

 

 

Use the diagram of the three cube-shaped cells in the picture to answer the following questions.

 

 

 

 

 

 

 

 

 

 

 

6. Cell A

Area of one side ____________________

Total Surface Area ____________________

Volume of the cube ____________________

7. Cell B

Area of one side ____________________

Total Surface Area ____________________

Volume of the cube ____________________

8. Cell C

Area of one side ____________________

Total Surface Area ____________________

Volume of the cube ____________________

 

 

Base your answers to questions 9 & 10 on the diagram below which represents parts of two nucleic acid molecules.

 

 

 

 

 

 

 

 

 

 

9. What is the normal nitrogenous base sequence in the segment of

strand Y shown in the diagram?

 

 

10. If strand X serves as the template for synthesis of strand Z, the base

sequence of that fragment of strand Z shown is

 

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#4