Answer:
In a chemical reaction the total mass of all the substances taking part in the reaction remains the same. Also, the number of atoms in a reaction remains the same. Mass cannot be created or destroyed in a chemical reaction
The female body responds to a drop in the luteinizing hormone B. By preparing for the next cycle.
- The luteinizing hormone remains at lower levels most of the time during the menstrual cycle.
- It reaches the highest levels around the 14th day of the menstrual cycle. It helps in the formation of follicles with the help of estrogen.
- An increase in LH triggers the increase of progesterone level and helps in preparing of corpus luteum.
- After the formation of the corpus luteum and the release of follicles, the level of LH drops.
- When the level of LH further decreases, this triggers the shedding of the uterine lining as no pregnancy takes place.
Thus, the low levels of LH are an indication of
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IV:The detergents
DV: the dishes
Hypothesis: The expensive dish detergent cleans better then cheaper detergent
Control: the amount of detergent used
Contants: the detergents
The early immune response to HIV-1 infection is likely to be an important factor in determining the clinical course of disease. Recent data indicate that the HIV-1 quasispecies that arise following a mucosal infection are usually derived from a single transmitted virus. Moreover, the finding that the first effective immune responses drive the selection of virus escape mutations provides insight into the earliest immune responses against the transmitted virus and their contributions to the control of acute viraemia. Strong innate and adaptive immune responses occur subsequently but they are too late to eliminate the infection. In this Review, we discuss recent studies on the kinetics and quality of early immune responses to HIV-1 and their implications for developing a successful preventive HIV-1 vaccine.