Uncategorized 11 - BIOLOGY JUNCTION

Volume Lab Answer Key

Part A: Answers will vary; however, my students usually end up with an average of 20 drops per milliliter. The biggest problem I encounter is that students count the number of drops to 11 ml. They should fill the cylinder to 10 ml (meniscus is on the 10 ml mark) and count the number of drops it takes to reach 11 ml.

Part B: Answers will vary. My students usually end up with a volume of 5-6 ml for three marbles.

Part C: Students should end up with measurements of 6.5 cm, 3 cm, and 1.5 cm if they measure to the nearest centimeter (two decimal places). The answer would be 6.5 x 3 x 1.5 = 29.25 cm3.

Part D: Students should end up with final measurements of 10 ml in each test tube if they measured carefully for each step. I allow ±0.5 ml for error. The final colors should be A – red, B – orange, C yellow, D – blue, E – green, and F – purple.

TIP: When mixing the main colors, make all of them dark. It is a good idea to test the colors before the lab to make sure the final results are close to the colors listed above. The purple often ends up as a very dark purple. It does help to hold the test tubes up to a light to determine the final colors.

Safety Rules: After the lab, ask students if anyone has colored hands or papers and relate to lab safety rules. If the water samples were chemicals, colored hands or papers would indicate that the person came in contact with the “chemicals.”

Sugar Template

Six Divisions of Algae

Six Divisions of Algae

Holt, Rinehart, & Winston

Sordaria Lab Pictures

Sordaria octad

Below you will find reproductions of a number of Sordaria octad preparations. For the purposes of mapping the tan locus with respect to its centromere, count only complete tetrads and count ALL complete tetrads on a particular slide.
Pictures by Fordyce G. Lux III

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8sordaria.jpg (48236 bytes)

9sordaria.jpg (65312 bytes)

Photosynthesis

Name:

Photosynthesis

True/False Indicate whether the sentence or statement is true or false.
	1.	All organisms require energy to carry out life processes.
	2.	Animals that live exclusively on a diet of other animals are unable to use carbohydrates to fuel their life processes.
	3.	When light hits a plant, all of the wavelengths are absorbed and used to make sugar.
	4.	A series of linked chemical reactions in which the product of one chemical reaction serves as the reactant in the next reaction is called a biochemical pathway.
	5.	An autotroph is able to make its own organic molecules from inorganic materials and energy.
	6.	The major light-absorbing pigment in plants is chlorophyll.
	7.	Plant cells use light to make ATP and NADPH.
	8.	The “light reactions” of photosynthesis can occur only under light conditions, and the “dark reactions” occur only during the dark hours.
	9.	The final product of photosynthesis is not actually glucose.
	10.	C4 and CAM plants use less water to produce the same amount of carbohydrate as C3 plants.
Completion Complete each sentence or statement.
	11.	Stacks of thylakoids, called ____________________, are found suspended in the stroma of chloroplasts.
	12.	A pigment that absorbs primarily red and blue photons of light for photosynthesis is called ____________________, while pigments that absorb other wavelengths and appear yellow and orange are called ____________________.
	13.	Organisms that harvest energy from either sunlight or chemicals in order to make food molecules are called ____________________.
	14.	The main pigment associated with the two photosystems is ____________________.
	15.	In the electron transport chain of photosynthesis, electrons travel from molecule to molecule as part of a(n) ____________________ atom.
	16.	The abundance of oxygen in Earth’s atmosphere is a result of ____________________.
	17.	Chemiosmosis results in the release of ____________________.
	18.	The third stage of photosynthesis, in which glucose is manufactured, is called the ____________________.
	19.	The scientist who determined the sequence of steps in the light-independent reactions was ____________________.
	20.	The ____________________ plants have an enzyme that is more efficient at fixing CO2 than is the enzyme that accomplishes this in ____________________.