Yes, an inkjet printer can work with just black ink, but its functionality might be limited. Typically, inkjet printers are designed to work with a combination of color and black ink cartridges to produce full-color prints. If color cartridges are empty or absent, many inkjet printers will allow for printing in a "black ink only" or "grayscale" mode. This is particularly useful for text documents or any printing task that doesn't require color. However, not all printers support this feature; some models may refuse to print at all if any of the cartridges are empty or removed. Additionally, for printers that do allow printing with only black ink, it's important to regularly check and maintain the empty color cartridges as they can dry out and potentially clog the printhead, leading to additional maintenance issues.

The sequence 5' GAA 3' in RNA corresponds to the codon for the amino acid glutamic acid (Glu). In the genetic code, amino acids are specified by sequences of three nucleotides known as codons. Each codon is unique to a specific amino acid or serves as a stop signal during protein synthesis. The genetic code is universal across almost all organisms, highlighting its fundamental role in biology. Therefore, the codon GAA directly codes for glutamic acid in the process of translating RNA into protein.

The Nikon 85mm f/1.8G lens does not come with a nano crystal coat. Nikon's Nano Crystal Coat technology is designed to reduce ghosting and flare, and it's typically employed on their higher-end lenses, such as the Nikon 85mm f/1.4G. However, the 85mm f/1.8G utilizes Super Integrated Coating (SIC) instead, which also helps to improve light transmission and reduce lens flare and ghosting to produce clearer images. While the SIC is effective, the Nano Crystal Coat offers a superior level of anti-reflective efficiency by minimizing internal reflections across a wide range of wavelengths. If having the lowest possible amount of flare and ghosting is critical for your photography, you might want to look at lenses equipped with the Nano Crystal Coat. However, the 85mm f/1.8G remains a popular choice for its excellent optical performance, wide aperture, and relatively affordable price point.