Answer:
B.
Explanation:
Proteins targeted to the mitochondrial matrix are unfolded during transport and refolded within the matrix, while proteins targeted to the nucleus are fully folded in the cytoplasm before nuclear transport. So, The correct statement is B.
Proteins targeted to the mitochondrial matrix are unfolded while being inserted into the mitochondria and are refolded within the matrix. Proteins targeted to the nucleus are completely folded into the cytoplasm before they are transported to the nucleus.
- Proteins targeted to the mitochondrial matrix are indeed unfolded while being inserted into the mitochondria. This unfolding allows them to pass through the mitochondrial membranes. Once inside the mitochondrial matrix, they can be refolded into their functional conformation.
- Proteins targeted to the nucleus are typically completely folded into their functional conformation in the cytoplasm before they are transported to the nucleus. The nuclear pore complex allows folded proteins to pass through while excluding unfolded ones.
So, The correct statement is B.
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B. Natural selection is a specific mechanism of evolution in which the heritable traits (characteristics) help an organism to survive and reproduce successfully.
C. Natural selection is a specific mechanism of evolution in which all acquired traits (characteristics) help an organism to survive and reproduce successfully.
b) provide essential amino acids.
c) prevent deficiency diseases.
d) provide fiber
Answer:
c) prevent deficiency diseases.
Explanation:
Vitamins are essential and specific organic compounds that are required mainly in the diet to facilitate the digestion of protein, however, they are not categorized with amino acids and as such they can't provide essential amino acid.
Vitamins are categorized into fat soluble vitamins(A,D,E and K) and water soluble vitamins (B anc C). Vitamins provides several to hundred of roles, majorly they helps to prevent deficiency diseases. Few of their roles are:
Vitamin A helps to prevent blindness. Food sources to obtain vitamin A include spinach, cod liver oil etc.
Vitamin D helps to maintain skeletal structure due to the calcium content embedded in Vitamin D. Therefore, lack of vitamin D can cause rickets.
Vitamin B-complexes e.g B-1 (thiamin) helps in synthesis of certain hormones, B-2 (riboflavin) which asssists in breakdown of fats and energy production. It can be gotten from Milk, youghurt etc. Deficiency in these vitamin B-complexes can cause heart-related disease, skin disorders, anemia etc.