Science Exam Flashcards

Question

Using food in the human body for energy

Answer 1

C₆H₁₂O₆+6O₂→6CO₂+6H₂O+Heat energy Above → is Enzymes Activity 1.1 Increases in CO₂ concentration in ppm, increased breathing rate. Activity 8.1 increases CO₂ concentration, decreases O₂ concentration, and increases in absolute humidity.

Answer 2

1. levels of oxygen increase 2. levels of carbon dioxide decrease Reasoning: When exercising, breath rate increases b/c more oxygen is inhaled so that energy can be made faster. As a result of this, more oxygen is inhaled faster, and more carbon dioxide is produced by being exhaled more.

Answer 3

When a French fry is digested: 1. it has been broken down from starch (polysaccharides) to glucose molecules (monosaccharides) 2. glucose + oxygen travels through the circulatory system to all cells to provide us w/ energy

Answer 4

CO₂ + water are used to make more glucose molecules that stay in the plant and cause an increase in mass from adding carbon to the plant.

Answer 5

Hydrolysis combines water and large food molecules to create sub-units Example: A carbohydrate with many subunits+ Many molecules of water→ Many Carbohydrate subunits

Answer 6

Dehydration synthesis removes water Example: Two amino acids → molecules with 2 amino acids+ water

Answer 7

PG. 11 -increase in the amount of activity causes changes we observed when we exercised in class. -heart beat faster, breathed faster, breathed more carbon dioxide, skin temp. decreased PG. 9 -Energy can make things happen simplest way to talk about it. There are many types of energy, such as light, thermal, kinetic, elastic, and sound.

Answer 8

PG.30 data from investigation provided evidence humans can get energy from eating plants, the tortilla chips activity illustrated. Your body converts chemical energy stored in plant into energy your cells can use. Therefore, by studying plants, how they get energy, you learn about how get energy you need. We set an experiment test plants need light, water, soil grow and produce food. We collected data which organized and written about CER for Activity 6.1. Our data demonstrated plants we grew needed light not just heat energy, the plants in dark not grow well as the plants in light, even though they at the same temperature. In addition, plants grew best in white light, blue light, red light, while plants in green light turn yellow, died. This demonstrates plants need certain colors light to grown. Our data shows plants need water to grow as plants without water died. The plants in soil, vermiculate (without soil) grew same indicating plants don't need soil to grow.

Answer 9

PG. 63 you look Venn diagram, you see carbohydrates, proteins have about same number carbon, oxygen atoms, twice as many hydrogen atoms. Glucose, a carbohydrate, 6 carbon atoms, 6 oxygen atoms, and 12 hydrogen atoms make C6H12O6. Fats have few oxygen atoms compared to carbon atoms. The chemical formula the triglyceride shown in reading is C56H110O6. Difference the number of oxygen atoms reason fats provide body with more energy than carbohydrates and proteins.

Answer 10

PG. 78 -One molecule of starch=thousands of carbohydrate subunits -chemical reaction, carbohydrate made of two subunits splits between the two subunits. One of the hydrogen atoms from water molecule separates from water molecule and combines with one subunit. -other oxygen atom and hydrogen atom from that same water molecule combine with the other subunit. -When starch breaks down, it turns into carbohydrate subunits. These subunits are new molecules that form a new substance glucose which has very different properties than starch. PG. 81 Organisms need to break down food molecules for two reasons. -complex food molecules are too big to fit inside of cells, but the subunits can easily get into a cell. Once the food molecule is in the cell, it can go through more chemical reactions to be used for energy and building materials. -different organisms need different kinds of carbohydrates and proteins. -when you eat an egg, you are eating the proteins that are important for chickens. However, you do not need chicken proteins to live. You need human proteins. Those chicken proteins must be broken down into their subunits so that your body can make a protein that is useful for you laboratory activity, we measured that starch had changed into glucose in the presence of the enzyme amalyse. We confirmed this by testing for glucose using Benedict’s indicator and found glucose in the starch solution containing enzyme and no glucose in the starch solution without enzyme. This helps us see that food molecules are broken down into sub-units for our body to use for energy or building materials.

Answer 11

1. animals and/or plants exhale CO₂ (b/c of cellular respiration) 2. Plants inhale CO₂ during photosynthesis 3. animals eat carbon-containing food molecules that plants make 4. carbon atoms are rearranged into carbon dioxide during cellular respiration (for both plants and animals) + Carbon atoms are rearranged into CO₂ during photosynthesis to make food molecules 5. Cycle repeats again with plants inhaling CO₂ (b/c of photosynthesis)

Answer 12

1. George Washington exhaled carbon atoms 2. plants took in CO₂ molecules 3. plants use these molecules to make food molecules (CO₂ molecules used in photosynthesis) 4. CO₂ molecules are either inhaled b/c of plant's cellular respiration or the plant (which took in the CO₂ molecules) was eaten Conclusion: The CO₂ molecules that have been exhaled by George Washington cycle through the environment in multiple different ways, like being taken in by plants through photosynthesis and the plants being eaten and/or the plants exhaling CO₂ b/c of cellular respiration.