*Question*
Q: What takes over the synthesis and secretion of progesterone throughout pregnancy as the corpus luteum degenerates? Read this paragraph and choose the correct option from the provided answers: The placenta takes over the synthesis and secretion of progesterone throughout pregnancy as the corpus luteum degenerates. Like estrogen, progesterone suppresses FSH and LH. It also inhibits uterine contractions, protecting the fetus from preterm birth. This hormone decreases in late gestation, allowing uterine contractions to intensify and eventually progress to true labor. The placenta also produces hCG. In addition to promoting survival of the corpus luteum, hCG stimulates the male fetal gonads to secrete testosterone, which is essential for the development of the male reproductive system. The anterior pituitary enlarges and ramps up its hormone production during pregnancy, raising the levels of thyrotropin, prolactin, and adrenocorticotropic hormone (ACTH). Thyrotropin, in conjunction with placental hormones, increases the production of thyroid hormone, which raises the maternal metabolic rate. This can markedly augment a pregnant woman's appetite and cause hot flashes. Prolactin stimulates enlargement of the mammary glands in preparation for milk production. ACTH stimulates maternal cortisol secretion, which contributes to fetal protein synthesis. In addition to the pituitary hormones, increased parathyroid levels mobilize calcium from maternal bones for fetal use. Choices: - vagina - uterus - ovaries - placenta A:
**Answer**
placenta

*Question*
Q: What causes light to refract? Read this paragraph and choose the correct option from the provided answers: Light slows down when it enters water from the air. This causes the wave to refract, or bend. Choices: - speeding up - blinking - bending - slowing down A:
**Answer**
slowing down

*Question*
Q: What part of an animal helps to prevent water loss and gives support and protection? Read this paragraph and choose the correct option from the provided answers: The arthropod exoskeleton consists of several layers of cuticle. The exoskeleton prevents water loss and gives support and protection. It also acts as a counterforce for the contraction of muscles. The exoskeleton doesn't grow as the animal grows. Therefore, it must be shed and replaced with a new one periodically through life. This is called molting . Choices: - membrane - cuticle - backbone - exoskeleton A:
**Answer**
exoskeleton

*Question*
Q: What kind of reaction adds water to an organic molecule and breaks the large molecule into smaller molecules? Read this paragraph and choose the correct option from the provided answers: A hydration reaction is the opposite of a dehydration reaction. A hydration reaction adds water to an organic molecule and breaks the large molecule into smaller molecules. Hydration reactions occur in an acidic water solution. An example of hydration reaction is the breaking of peptide bonds in polypeptides. A hydroxide ion (OH - ) and a hydrogen ion (H + ) (both from a water molecule) bond to the carbon atoms that formed the peptide bond. This breaks the peptide bond and results in two amino acids. Choices: - heat reaction - supplementation reaction - aerobic reaction - hydration reaction A:
**Answer**
hydration reaction