Ribosomes are what make up proteins (the protein builders). There are a lot of ribosomes in the cytoplasm.
Explanation: Ribosomes connect mRNA(messenger RNA) and tRNA (transfer RNA) to synthesize polypeptides and proteins. Proteins are made up of building blocks amino acids. Polypeptides are chains of amino acids and portions of proteins in cells.
(Also, ribosomes are usually the small dots that you see in a cell diagram)
(Hope this helps :) )
Answer:
An higher being, or God created them.
Explanation:
This may not be the exact answer you are looking for, but lots of people looked to higher beings to make sense of the world before science.
In spermatogenesis,from a single spermatogonia 4 haploid sperms are produced after meiosis (100% efficiency).But in case of oogenesis,from a single oocyte only one is transformed into ovum even after meiotic division(25% efficiency)
Answer: Nonrenewable energy resources, like coal, nuclear, oil, and natural gas, are available in limited supplies. This is usually due to the long time it takes for them to be replenished. Renewable resources are replenished naturally and over relatively short periods of time.
Explanation:
The right option is d. Perimenopause
Perimenopause is the transition
phase between regular menstrual periods and no periods at all. It takes place
over several years in advance of the menopause. Perimenopause generally starts
for women in their mid-40s and it can start even earlier. Symptoms of Perimenopause include fatigue, breast
tenderness, irregular periods and mood swings.