Answer: The correct statements are a, c, and e.
Explanation:
Oogenesis is the process by which ovum or female gamete is formed.
The process of oogenesis initiates in a female during her fetal stages. During embryonic stage, the oogonium (2n) or stem cells divide and mature into primary oocyte (2n) with the help of mitotic division.
Primary oocyte starts its meiotic division but gets arrested in prophase I stage before birth. After puberty, one oocyte resumes the division each month till menopause.
The primary oocyte completes the first meiotic division and produce secondary oocyte (n) and one polar body. The polar body is usually small in size and gets degenerated with time. It may or may not complete its meiosis II.
The first meiotic division is usually completed one day before ovulation (not just prior to ovulation).
Secondary oocyte is released during ovulation. It undergoes meiosis II but gets arrested in metaphase II. It does not complete its meiosis II until fertilized by a sperm.
Once, sperm penetrates the secondary oocyte, it resumes and completes its second division. It releases second polar body which also gets degenerated.
Thus, the correct statements are a, c, and e.
Answer: NADH
Explanation: nicontinamide adenine dinucleotide (NAD) carrying two electrons and bonded with a hydrogen (H)
Answer:
B. Falling transportation costs
Explanation:
that makes the most sense to me
Answer:
Proteins are the internal machinery of a cell. Among the many different roles that proteins serve in the cell, proteins have structural roles to help the cell keep its shape, regulatory roles to control the movement of particles in and out of the cell, and repair roles to help signal and help with the repair of a cell if it is damaged. Proteins are especially important in cell division because they control when it starts, ends, and every movement in between.