Protein Structure

Lateral roots in plants develop from the pericycle. The pericycle is a layer of parenchymatous cells located just inside the endodermis of the root. These cells have the ability to divide and give rise to lateral roots. This is a critical part of root growth, allowing the plant to form a branched root system. Here's a breakdown of other options:
- Epidermis: The epidermis is the outermost layer of cells in the root and is not involved in the formation of lateral roots.
- Hypodermis: The hypodermis is present in some roots and lies beneath the epidermis, but it does not directly give rise to lateral roots.
- Endodermis: The endodermis is the innermost layer of cells surrounding the vascular tissue, and it is not directly involved in lateral root formation. Thus, the correct answer is Pericycle, where lateral roots originate.

Step 1: Understanding Amino Acid Classification - Acidic Amino Acid → Glutamic Acid (II)
- Aromatic Amino Acid → Tryptophan (III)
- Neutral Amino Acid → Valine (I)
- Basic Amino Acid → Lysine (IV)

Step 1: The codon AUG serves dual functions in protein synthesis. It acts as the initiator codon, signaling the start of translation. Additionally, it codes for methionine, the first amino acid incorporated into the polypeptide chain during protein synthesis. Therefore, the correct option is that AUG serves as the initiator codon and codes for methionine.

Let’s evaluate each statement: - A) In C4 plants, photosrespiration is absent: This is true. C4 plants, such as maize and sugarcane, have mechanisms that minimize photorespiration by initially fixing carbon dioxide into a four-carbon compound, which effectively concentrates CO2 in the bundle sheath cells where the Calvin cycle takes place, reducing the oxygenase activity of Rubisco. - B) In the photorespiration pathway, there is no synthesis of ATP and NADPH: This is correct. Photorespiration consumes energy and reduces the efficiency of photosynthesis, as it does not produce ATP or NADPH but rather uses them, which makes the process costly for the plant. - C) C4 plants are photosynthetically more efficient: This is true. Due to their specialized biochemical and anatomical adaptations, C4 plants are more efficient in photosynthesis under high light intensity, high temperatures, and dry conditions. - D) Kranz anatomy is found in C4 and CAM plants: This is incorrect. Kranz anatomy, characterized by a wreath-like arrangement of bundle sheath cells surrounding the mesophyll cells, is specific to C4 plants. CAM plants do not exhibit Kranz anatomy; they have different adaptations for their photosynthetic pathway. Therefore, the correct statements are A and C.