Question

question 6 (2.5 points)
to visualize the structure of dna, which has a width of 10 nm, which microscope would be best?
fluorescence microscope
light microscope
staining microscope
polarized microscope
electron microscope
question 7 (2.5 points)
a water - soluble hormone (signaling molecule) would most likely bind to which membrane protein?
active transporter
recognition

Explanation:

• Question 6: DNA with a width of \(10\ nm\) is at the nanoscale. Electron microscopes have much higher resolution (can resolve structures at the nanometer scale) compared to light - based microscopes (fluorescence, light, staining, polarized microscopes which are limited by the wavelength of light to around \(200 - 300\ nm\) resolution).
• Question 7: Water - soluble hormones are unable to pass through the lipid - bilayer of the cell membrane. They bind to cell - surface receptors (which are a type of recognition protein). Active transporters are involved in moving molecules against a concentration gradient across the membrane, not in hormone binding.

Answer:

• Question 6: electron microscope
• Question 7: recognition