Which one of the following are the correct encoding sites of large and small subunits of Rubisco enzyme in red and brown algae?
Both large and small subunits in chloroplast.
Rubisco Enzyme Subunit Encoding
Rubisco is a very important enzyme for photosynthesis in most plants and algae. It fixes carbon dioxide from the atmosphere. The Rubisco enzyme is typically made up of two types of protein subunits: a large subunit (LSU) and a small subunit (SSU).
Gene Location for Rubisco Subunits
The genes that carry the instructions for making these subunits are located in different parts of the cell in different organisms. In most land plants and green algae, the gene for the large subunit is found in the chloroplast genome, while the gene for the small subunit is located in the nuclear genome. This means the LSU is produced within the chloroplast, and the SSU is produced in the cytoplasm (from nuclear DNA instructions) and then imported into the chloroplast.
Rubisco Encoding in Red and Brown Algae
However, the location of these genes can vary in different groups of algae. In red algae (Rhodophyta) and brown algae (Phaeophyceae), the genetic situation is different compared to land plants and green algae.
In both red algae and brown algae, the genes encoding both the large subunit (LSU) and the small subunit (SSU) of the Rubisco enzyme are found within the chloroplast genome. This is a key characteristic distinguishing them from land plants and green algae regarding Rubisco gene location.
Analyzing the Options
- Option 1: Large subunit in chloroplast and small subunit in nucleus. This is typical for land plants and green algae, but not red or brown algae.
- Option 2: Large subunit in nucleus and small subunit in chloroplast. This is not the typical arrangement for either subunit.
- Option 3: Both large and small subunits in nucleus. The large subunit gene is generally found in the chloroplast in photosynthetic eukaryotes.
- Option 4: Both large and small subunits in chloroplast. This correctly describes the location of the genes for both Rubisco subunits in red and brown algae.
Therefore, the correct encoding sites for both large and small subunits of the Rubisco enzyme in red and brown algae are within the chloroplast.
Important Questions from Photosynthesis
Kranz anatomy is found in _____ plant.
Which plant pigment is present in tomatoes?
Which one of the following reactions takes place during the reduction phase of the Calvin - Benson cycle?
The following statements were made with the assumption that the concentration of 3- phosphoglycerate is high inside chloroplasts of an actively photosynthesizing leaf.
A. There will be high concentration of triose phosphate in the chloroplast.
B. The activity of ADP-glucose pyrophosphorylase will be inhibited.
C. The carbon flow will be diverted from sucrose to starch.
D. Starch synthesis will be inhibited and carbon flow will be more towards sucrose synthesis.
Which one of the following combinations of above statements is correct?
The table below shows photosynthetic type, temperature and sunlight intensity levels.
Photosynthetic Type Temperature Sunlight Intensity A. C3 Plant i High P. High B. C4 plant ii Moderate Q. Moderate iii Low R Low Which of the following correctly matches the plant photosynthetic type with the temperature and sunlight conditions in which photosynthetic rate per unit leaf area is maximum for that plant?
