Nucleic acid structure refers to the structure of nucleic acids such as DNAand RNA. Chemically speaking, DNAand RNA are very similar. Nucleic acid structure is often divided into four different levels: primary, secondary, tertiary and quaternary.
Answer: The follicle assumes a new role which is:
--> the secretion of hormone PROGESTERONE and
--> OESTROGEN
Explanation:
The cycle in the female reproductive system of humans which tak s 28dayd to complete is known as menstrual cycle. At the beginning of the menstrual cycle, several primary oocytes begin to develop. Each oocyte is surrounded by actively dividing granular cells from which it receives nutrients. The whole structure is called a FOLLICLE.
A developing follicle secretes OESTROGEN.
Usually, only one of the developing follicles becomes mature to produce an ovum. As the follicle matures, it becomes filled with fluid and the oocyte is pushed to one side. Ovulation occur when there is release of an ovum from a mature follicle.
The ruptured mature follicle develops into a CORPUS LUTEUM which is a solid yellow body that secretes the hormone PROGESTERONE. This is the hormone that helps to maintain the early stages of pregnancy if fertilization and implantation of embryo occurs. In the absence of pregnancy, the corpus luteum shrivels.
Answer:
Homology refers to the similarities between the group of species that share the common ancestor. The homology individuals arise from a common ancestor. They shows divergent evolution. The basic structure in homology is similar. The organs perform different function. They occur due to the evolutionary process.
Homoplasy refers to the shared characters of the group of species that do not share the common ancestor. The homoplasy do not involve the common ancestor. They shows convergent evolution. The basic structure in homoplasy is different. The organs perform the similar function. They occur due to the adaptation in different habitats.
Answer:
Energy is lost at each trophic level and between trophic levels as heat and in the transfer to decomposers ([Figure 4]). Thus, after a limited number of trophic energy transfers, the amount of energy remaining in the food chain may not be great enough to support viable populations at yet a higher trophic level.
Explanation:
Heterotrophs is the answer