Ex 1-2 Review Upadhyaya

I have made a thick, homemade ketchup to go with my dinner potato. I measure the density of the ketchup to be 1.31 g/mL. My friend, a ketchup expert, tells me the actual density is 1.10 g/mL. What is the Percent Error of my measurement of ketchup density?

• 19.1%

• 16.0%

• -17.1%

• Potato

What is the correct formula for Density?

• D = Volume/Mass

• D = cm / mL

• D = Mass / Volume

• D = L * W

I have a solution of Bromophenol Blue (BPB) that I want to dilute for an upcoming experiment. The total volume of the solution I'm making will be 20 mL. My starting concentration of BPB is 0.017 mg/mL; I add 5 mL of BPB soln to 15 mL of DI water. What is my new BPB concentration?

  [Volume of Added Solution x Concentration of Initial Solution] / Total Volume

• 0.0057 mg/mL

• 0.0043 mg/mL

• 0.013 mg/mL

• 0.068 mg/mL

What is Absorbance?

• A pattern of light absorption over a range of wavelengths for a particular solution/substance.

• The amount of light that passes through a sample compared to the initial amount of light present.

• How much water a sponge can hold.

• The distance in nm between successive crests of a wave of light.

I'm designing an experiment where I measure how different concentrations of caffeine in a cup of coffee impact the reaction of pleasure receptors in the brain. I ask for BIO 2010L participants to volunteer for the experiment and sort them into three groups. The first group receives no caffeine, the second group receives 60mg of caffeine, and the third group receives 120mg of caffeine. What function does the FIRST group play in my experiment?

• Positive Control

• Negative Control

• Independent Variable

• Dependent Variable

What is the function of using immersion oil on the 100x Objective?

• Immersion oil has the same refractive index as glass, so it's as if the light on our sample is only passing through one medium. This improves our resolution.

• Immersion oil increases our field of view, allowing us to see more of our sample.

• Immersion oil adds 10x magnification to our Total Magnification.

• Immersion oil increases the contrast between the slide and our sample, which allows us to view cytoplasmic streaming.

How do amoeba move around?

• They use their contractile vacuole for propulsion.

• They use their long, tail-like flagella.

• They use pseudopodia and cytoplasmic streaming.

• They use small, hair-like projections called cilia.

Which of the following organisms is likely responsible for helping create an oxygen atmosphere on Earth and also lends support to the endosymbiotic theory?

• Cyanobacteria - they are photosynthetic prokaryotes that form symbiotic relationships with plants

• Lactobacillus - they are anaerobic prokaryotes and similar in size to mitochondria

• Elodea - they have cell walls made of cellulose and use kinesins for cytoplasmic streaming

• Potato - they store starch in their amyloplasts as fuel

What is visible in Elodea after staining the cells with Methylene Blue?

• The Cell Wall

• The Nucleus

• Cytoplasmic Streaming

• The Central Vacuole

I would like to take a high-quality close-up photo of my dinner potato. Pulling out my camera, I begin at a magnification of 2x. Since my Field of View (FOV) at this point is 7 cm and also contains some nearby broccoli (ew), I zoom in until my magnification is 3.7x. What is the new FOV with which I view my dinner potato?

• 0.60 cm

• 1.1 cm

• 13.0 cm

• 3.8 cm