Answer:
The correct answer is C: "The secretory phase of the uterine (menstrual) cycle occurs when <em>progesterone stimulates the endometrium to prepare it for implantation".</em>
Explanation:
The luteal phase, also known as a <u>secretory phase </u>or postovulatory phase, has place immediately <em>after ovulation</em>, from 15th to 28th day, and it lasts <em>until the end of the menstrual cycle</em> when bleeding starts again.
During the secretory phase, the <em>follicle</em> in the ovary <em>produces </em><em>progesterone</em> to keep <em>preparing the uterus for a possible pregnancy</em>. If there is no fecundation, estrogen and progesterone levels fall as the follicle reduces. When this happens, the endometrial is eliminated as menstruation and a new cycle begins.
<em>If the ovule is fecundated, </em><em>it occurs implantation</em><em> </em>and follicles continue to produce progesterone and estrogen in high amounts to sustain the endometrial until the placenta is formed.
Answer:
Telomerase acts to elongate the 3' end of linear DNAs.
Explanation:
The 5' ends of the linear DNA can not be replicated by DNA polymerase due to the absence of free 3' end to be elongated. This is prevented by the action of telomerase enzyme which contains both RNA and protein components. The RNA component of the telomerase is 150 nucleotides long.
The telomerase enzyme elongates the 3' end of the template strand by using its inbuilt RNA template. Since it uses an RNA template to make the DNA copies, it is a reverse transcriptase. Repeated translocation and repositioning of the enzyme elongates the 3' end of the template DNA.
The RNA primase makes the RNA primer at the end of the new telomere strand which is then elongated by DNA polymerase. DNA ligase seals the nick. In this way, telomerase serves to prevent the loss of 5' ends of linear DNA in successive rounds of DNA replication.
Explanation:
who many chambers does the heart has
ANSWER IS : A troposphere
Answer:
Outermost
Explanation:
Valence electrons are the electrons in the outermost shell, or energy level, of an atom
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