A2.2 Cell Structure

Multiple Choice

Which of the following best describes the level of organization discussed in the theme 'Unity and Diversity' for this session?

• Tissues

• Organs

• Cells

• Organisms

Open Ended

Why is understanding cell structure important for studying the unity and diversity of life?

Open Ended

How do you think understanding cell structure can help you appreciate the unity and diversity of living organisms?

Open Ended

What questions do you still have about cell structure after today's lesson?

Open Ended

How is microscopy used to investigate cell structure?

Open Ended

What are the features common to all cells and the features that differ?

Multiple Choice

Which of the following is NOT a topic covered under A2.2 Cell Structure?

• Microscopy skills

• Prokaryote cell structure

• Photosynthesis

• Atypical cell structure in eukaryotes

Open Ended

State the three parts of the cell theory.

Multiple Select

Which of the following are key concepts of deductive reasoning as described in the context of cell theory?

• Progressing from specific observations to general ideas

• Using general ideas to make specific predictions

• All known organisms are composed of at least one cell

• Newly discovered organisms will be composed of at least one cell

Multiple Choice

Which of the following statements is a prediction that can be made based on cell theory?

• All living things are made of tissues.

• A newly discovered organism will consist of one or more cells.

• All organisms are multicellular.

• Cells can exist independently of organisms.

Fill in the Blank

Measurement using instruments in microscopy is a form of ___ observation.

Multiple Choice

Students should have experience with making temporary mounts of cells and tissues, staining, and measuring sizes using an eyepiece graticule. Which of the following is NOT typically part of microscopy skills?

• Calculating actual size and magnification

• Producing a scale bar

• Performing genetic sequencing

• Taking photographs

Multiple Choice

When preparing temporary mounts to view under a light microscope, which stain would you use for onion epidermal cells?

• Methylene blue

• Iodine solution

• Safranin

• Crystal violet

Open Ended

Explain why it is important for students to practice measuring sizes using an eyepiece graticule and how this relates to quantitative observation in science.

Multiple Choice

Which instrument is used to measure the size of objects viewed under a microscope, and what is the difference between an eyepiece graticule and a stage micrometer?

• Eyepiece graticule; Eyepiece graticule has arbitrary units, stage micrometer has known units

• Stage micrometer; Stage micrometer has arbitrary units, eyepiece graticule has known units

• Ruler; Both have known units

• Scale bar; Both have arbitrary units

Multiple Choice

Which of the following statements about taking photos of micrographs is correct?

• Microscope cameras and smartphones can both be used to take photos of micrographs.

• Only microscope cameras can take photos of micrographs.

• Smartphones cannot be used to take good quality photos of micrographs.

• Scale bars cannot be added to micrographs.

Fill in the Blank

Fill in the blank: The ability of a microscope to distinguish details of a specimen is called ___.

Multiple Choice

A student measures the length of a cell in a micrograph as 50 mm. The actual length of the cell is 10 mm. What is the magnification?

• 5x

• 0.2x

• 500x

• 50x

Multiple Select

When converting between units for magnification calculations, what is the relationship between millimeters (mm), micrometers (μm), and nanometers (nm)? Select all that apply.

• 1 mm = 1000 μm

• 1 μm = 1000 nm

• 1 mm = 100,000 nm

• 1 mm = 1,000,000 nm

Multiple Choice

Which of the following is the correct order of steps to calculate the magnification of an image using a scale bar?

• Measure the length of the scale bar, note the actual length, input values into the formula, convert to nm, calculate magnification

• Note the actual length, measure the length of the scale bar, convert to nm, input values into the formula, calculate magnification

• Convert to nm, measure the length of the scale bar, note the actual length, input values into the formula, calculate magnification

• Calculate magnification, measure the length of the scale bar, note the actual length, input values into the formula, convert to nm

Multiple Choice

Based on the steps shown in the images, what is the magnification if the measured length of the scale bar is 20mm and the actual length is 0.4nm?

• X 5,000

• X 50,000

• X 500,000

• X 500

Multiple Choice

After calculating the magnification, what is the next step to determine the actual length of the mitochondrion?

• Measure the actual length of the mitochondrion in mm and convert to nm

• Rearrange the magnification formula

• Calculate the magnification using the scale bar

• Convert the measured length to mm

Fill in the Blank

Actual Length = ___ ÷ Magnification

Open Ended

Explain the advantages of electron microscopy compared to light microscopy.