First helicase separates the two strands of DNA and then DNA polymerase adds nucleotides following the base pair rule.
Answer:
True. You can get vitamin A as "preformed vitamin A" which is already active and/or you can get vitamin A as carotenoids which the body can turn into active vitamin A.
Explanation:
There are two different types of vitamin A that can be obtained from food:
1. Preformed vitamin A, which is already active, is found in animal products such as beef, fish, poultry and dairy products.
2. Provitamin A, which is the inactive form, is found in plant-based foods, such as fruits and vegetables. The most common type of provitamin A is β-carotene, which is a carotenoid that the body can turn into active vitamin A via an enzyme named β-carotene 15,15'-monooxygenase.
The series of cells observed which lack membrane-bound
internal organelle are called prokaryotes type of cells.
Prokaryotic organisms such as bacteria don’t have internal
membrane, or don’t have nucleus which makes it different from eukaryotic
organisms such as human beings.
