EDUC 386 Lecture 8: 3_10_21

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beigedinosaur606

18 Apr 2021

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We will focusing more on how kids think about mathematics, some of the struggles they may have, atypical ways of thinking about numbers. Total on test is 48 points only the letter grade is recorded in the grade sheet. Office hours thursday morning, 9:00 am - 10:00 am (questions about test 1 only) Book your appointment, if you want to see me or if you have any question about your responses on the test or studying or whatever it is concerning test 1. Material covered: weeks 5,6,7 problem sets 14-19. Content in weeks 1-4 is required to understand the material for the test (i. e. place value) I want you to be able to explain to children why algorithms work. You can create a file, or upload a word docx. You can still handwrite the responses and then scan it into one pdf. Other than where to upload, which you will receive in the morning before the test opens.

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Please check my work. I am have to bring my grade up so I need to make sure I get these right this week Here are my notes and answers from lab this week please let me know if I missed any.

NOTES:

Experiment 1: The Effect of Temperature on Catalase Activity

Test tube #1(10ÃÂ°C)

Add 5 mL of 3% hydrogen peroxide

Add 5 mL of water

Add 1 mL of catalase

Observe bubbles: No bubbles observed (or very, very little)

Color changed to red

Test Tube #2 (21.5ÃÂ°C)

Add 5 mL of 3% hydrogen peroxide

Add 5 mL of water

Add 1 mL of catalase

Observe bubbles: Bubbles appeared quickly and constantly for the first 10 seconds then stopped

Color changed to red

Test Tube #3 (40ÃÂ°C)

Add 5 mL of 3% hydrogen peroxide

Add 5 mL of water

Add 1 mL of catalase

Observe bubbles:Bubbles appeared slowly and Sporadically for about 10 seconds then stopped.

Color changed to red

Test Tube #4(60ÃÂ°C)

Add 5 mL of 3% hydrogen peroxide

Add 5 mL of water

Add 1 mL of catalase

Observe bubbles: Bubbles appeared instantly and continued sporadically continued for 10 seconds

color changed to red

Test Tube #5 (80ÃÂ°C)

Add 5 mL of 3% hydrogen peroxide

Add 5 mL of water

Add 1 mL of catalase

Observe bubbles:Bubbles appeared instantly, and sporadically continued for about 10 seconds then stopped.

Color of solution changed to red.

Experiment 2: The Effect of Substrate Concentration on Catalase Activity

Test Tube #1

Add 8mL Water

Add 2mL 3% Hydrogen Peroxide (mL)

Add 0.1 mL of catalase

Time for bubbles to stop forming: .38 seconds

Test Tube #2

Add 5mL Water

Add 5mL 3% Hydrogen Peroxide (mL)

Add 0.1 mL of catalase

Time for bubbles to stop forming: 32 seconds

Test Tube #3

Add 2mL Water

Add 8mL 3% Hydrogen Peroxide (mL)

Add 0.1 mL of catalase

Time for bubbles to stop forming: 28 seconds

Test Tube #4

Add 0mL Water

Add 10mL 3% Hydrogen Peroxide (mL)

Add 0.1 mL of catalase

Time for bubbles to stop forming: No bubbles

Experiment 3: The Effect of pH on Catalase Activity

Test Tube #1 (21.5ÃÂ°C)

Add 5 mL of 3% hydrogen peroxide

Add 5 mL of pH 2 buffer

Add 1 mL of Catalase Solution

Observation: No bubbles

Test Tube #2 (40ÃÂ°C)

Add 5 mL of 3% hydrogen peroxide

Add 5 mL of pH 6 buffer

Add 1 mL of Catalase Solution

Observation: bubbles appear immediately

Test Tube #3 (60ÃÂ°C)

Add 5 mL of 3% hydrogen peroxide

Add 10mL of pH 10 buffer

Add 1 mL of Catalase Solution

Observation: no bubbles.

Experiment 1: The Effect of Temperature on Catalase Activity

Lab Results

At which temperatures did catalase function somewhat, but not optimally?

40 degrees the bubbles appeared slowly and continued sporadically for about 10 seconds before stopping. At 60 & 80 degrees the bubbles appeared immediately but were sporadic as well.

Data Analysis

Why did catalase fail to function at 80 Â°C?

Because the Enzyme catalase denatures

Experiment 2: The Effect of Substrate Concentration on Catalase Activity

Lab Results

Fill in the table below with your results from the substrate concentration experiment.

Substrate Concentration Results
Test Tube	Bubbles Formation (min)
1	00:38 seconds
2	00:32 seconds
3	00:28 seconds
4	No bubbles.

Data Analysis

Before the catalase concentration was saturated with hydrogen peroxide, why did the enzyme function vary with substrate concentration?

The enzymes had varied results before the catalyst concentration was changed due to the differences in temperature. In experiment one all measurements were the same, the variable was the temperature. In experiment two, the concentrations of each material were the variable along with the temperature.

Experiment 3: The Effect of pH on Catalase Activity

Lab Results

What was the pH value at which catalase functioned the best?

pH 6 buffer

Data Analysis

Why did catalase only function in a limited range of pH values?

Conclusions

What are the enzyme, substrate, and product in these experiments?

The enzyme is Catalase

The Substrate is Hydrogen peroxide

The product was the bubbles.

What role does catalase play in the mammalian liver, or any other cell it is found in?

Catalase is an enzyme in the liver that breaks down harmful hydrogen peroxide into oxygen and water. When this reaction occurs, oxygen gas bubbles escape and create foam.

Reference:

https://www.scientificamerican.com/article/bring-science-home-liver-helping-enzymes/

I want to make sure I understand my lab, so can someone help me with the prelab questions?

Hello, I am working on an assignment related to Harley-Davidson Motorcycles. After reading the article below, please complete the 3 questions at the end.

Harley-Davidson Wheels Out an Electric Bike; Hog Maker Aims for Younger Riders With Electric-

Motorcycle Test

Harley-Davidson Inc., known for gasoline-powered motorcycles thundering with machismo, is testing a battery-powered model that it hopes will appeal to younger people concerned about the environment.

"We'd like to get customer feedback," Matt Levatich, Harley's president and chief operating officer, said in an interview, adding that the product is at least two years away from being offered for sale. For now, he said, the lithium-ion batteries in prototype models have a range of roughly 100 miles between recharges under typical riding conditions. They can go from zero to 60 miles an hour in "just under four seconds," he said.

The Milwaukee-based company said on Thursday that "select consumers" around the country next week will start getting a chance to ride prototype cycles with rechargeable batteries.

Harley wouldn't be the first to offer such a motorcycle. Companies including Zero Motorcycles Inc., Brammo Inc. and Mission Motorcycles Inc. now sell battery-powered motorcycles, and bigger manufacturers are experimenting. BMW AG sells a battery-powered scooter, dubbed the C evolution, in Europe. So far, said Harley's Mr. Levatich, sales of electric motorcycles are "insignificant."

"We anticipate it's going to appeal to a younger, more urban demographic," a Harley spokesman said. The company said the test was part of a goal of "preserving the riding environment."

The company still hasn't decided whether or when to put such motorcycles on the market and is looking for feedback from bike owners before proceeding further, he said. The project, dubbed LiveWire, has been in the works for four years, he said.

Chris Narayanan, 39, said he is curious about the battery-powered bike. "I'd give it a try if I had the opportunity," said the New York resident. For now, though, he is having fun with his 1998 Harley Sportster 1200 and plans to upgrade to a bigger Harley in a few years. "It's an interesting gamble for Harley. I know they want to appeal to younger riders and get them into Harley."

Justin Massey, general sales manager for a Harley-Davidson dealership in Hammond, Ind., thinks the sporty, racing-bike styling and first-of-its-kind status for Harley will attract an audience on its tour of dealerships. "I'm sure it will create quite a buzz," said Mr. Massey, who doesn't know if his dealership will be on the tour. "It's a good-looking bike and people will want to be around it."

Rather than the rumbling sound of traditional Harleys, the new machines sound more like a jet engine, only much quieter, Mr. Levatich said.

The project wasn't launched in response to environmental regulations, he said. Rather, current technology allows the company to produce a battery-powered cycle and "we feel we should," Mr. Levatich added.

James Hardiman, an analyst for Longbow Research, called the project a surprise. "It's a pretty big departure from anything they've ever done," he said and should help Harley appeal more to a younger and more environmentally conscious crowd.

Initially, "you're not going to get very far from one charge," he said, but battery technology is going to get "a whole lot more efficient in the years to come."

For people who don't already ride motorcycles, Harley promised to offer a "simulated riding experience" rather than a road test. Experienced riders will be invited for highway rides.

In recent years, Harley has striven to reduce its reliance on ageing white male baby boomers and appeal more to young people, women and minorities. As part of the company's strategy, two new bikes, known as the 750 and 500, are being rolled out. These smaller bikes are aimed at younger riders, who might find a traditional Harley touring bike too large or heavy to handle, particularly on crowded city streets.

The company didn't release a possible price for the LiveWire. High costs and limited range have kept demand low for battery-powered cars so far.

Harley-Davidson is the dominant U.S. supplier of heavyweight motorcycles. For this year's first quarter, the company reported that its share of sales in the U.S. market for new motorcycles with engines of 601 cubic-centimetres displacements or greater was 56%.

(Please use detail in answering each question below. And also please use the information in the article above to answer the three questions below).

1. Please segment the consumer market for motorcycles in the US using a needs-based segmentation strategy.

2. For each needs-based segment, determine which demographics, life-styles, and usage behaviors make the segment distinct and identifiable (actionable by marketers).

3. Based on the information in the article and your own research, determine the overall attractiveness and profitability of each segment.

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EDUC 386 Lecture 8: 3_10_21

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