$$\mathrm{C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{energy}}$$

Question 1

Which piece of lab equipment is shown in the image, and for which experiment was it primarily used in your GOB Chemistry labs?

Accepted Answer

A CO$$_2$$ gas sensor, used to measure carbon dioxide production during the cellular respiration lab.

Question 2

Write the chemical equation for photosynthesis in words.

Accepted Answer

Carbon dioxide and water produce glucose and oxygen.

Question 3

Which biomolecule did we test for with iodine during the photosynthesis lab, and what does a positive result look like?

Accepted Answer

Starch; a positive result is a blue-black color.

Question 4

What is the main purpose of the solvent in the paper chromatography lab?

Accepted Answer

To carry the pigments up the paper, separating them based on solubility and polarity.

Question 5

Write the summary equation for cellular respiration in symbols.

Accepted Answer

$$\mathrm{C_6H_{12}O_6$ + 6O_2 ightarrow 6CO_2 + 6H_2O + 	ext{energy}}$$

Question 6

During the photosynthesis lab, how did we bleach the leaves to test if photosynthesis was occurring?

Accepted Answer

By boiling the leaves in alcohol to remove chlorophyll, then staining with iodine.

Question 7

Which carbohydrate produced the highest yield of gas in the yeast fermentation lab?

Accepted Answer

Glucose

Question 8

Why was the temperature of $$37\ ^\circ \mathrm{C}$$ used in the incubator during the yeast fermentation lab?

Accepted Answer

It is the optimal temperature for yeast enzyme activity and fermentation.

Question 9

What is the starting compound for both fermentation and cellular respiration?

Accepted Answer

Glucose ($$\mathrm{C_6H_{12}O_6$})$$

Question 10

What was the purpose of using tetrazolium (TTC) on germinated corn seeds in the cellular respiration lab?

Accepted Answer

To visualize areas of active cellular respiration by turning red where respiration occurs.

Question 11

Which area of a corn kernel has the highest rate of respiration once it has germinated?

Accepted Answer

The embryo

Question 12

Which group of beans produced the most CO$$_2 in $$the cell respiration lab?

Accepted Answer

Germinating beans

Question 13

Write the summary equation for alcohol fermentation in symbols.

Accepted Answer

$$\mathrm{C_6H_{12}O_6$ \rightarrow 2C_2H_5OH + 2CO_2}$$

Question 14

What type of extract was used for the paper chromatography lab?

Accepted Answer

Spinach leaf extract

Question 15

Which glassware was used to measure gas production in the fermentation lab?

Accepted Answer

Graduated cylinder

Question 16

If given a human karyotype, how can you distinguish between a male and a female?

Accepted Answer

A male has one X and one Y chromosome; a female has two X chromosomes.

Lab Exam 3 Review – Photosynthesis, Cellular Respiration, Chromatography, and Cell Cycle

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