Any answers to pick from?
Answer:
The correct option is <em><u>B. Eukarya only</u></em>
Explanation:
Bacteria can be described as prokaryotic organisms that do not possess a nucleus. Their genetic material is generally present in the cytoplasm of the cell in a region called nucleoid. Some extra genetic material is found in them in the form of plasmids. Hence, option D is not correct.
The domain, Archae, contains prokaryotes and they lack a nucleus. Hence, option A and C are not correct.
Eukaryotes are multicellular organisms which contain a nucleus and other membrane-bound organelles. Hence, option B is correct.
Answer:
The correct answers would be:
- a a zygote is formed
- b a barrier to other sperm forms immediately
Acrosomal and cortical reactions take place at the time of fertilization of egg and sperm.
Acrosomal reaction helps in penetrating the zona pellucida so that sperm nuclei can enter the oocyte.
Cortical reaction results in the hardening the zona pellucida which prevents the entry of any other sperm cell.
Post-fertilization, the oocyte completes its second meiotic division and matures into the ovum.
The pronucleus of the male moves towards the center of the oocyte in order to fuse with the pronucleus of the female. It results in the formation of a diploid zygote nucleus. It divides with the help of mitotic divisions and develops into the embryo.
Energy conversions that is the answer
