Nuclear receptors bind as dimers to inverted repeat DNA sequences. These receptors can be categorized into two groups: steriod receptors and metabolite receptors. Match the description with the type of nuclear receptor. a. Form head-to-tai dimers
b. These receptors typically bind cholesterol- derived hormones
c. Bind to direct repeat DNA sequences
d. Ligands are often derived from dietary nutrients, including vitamins, lipids, and derivatives of amino acids
e. Bind to inverted base repeats due to the orientation of the receptor dimer

the corpus luteum secretes estrogens and progesterone. the latter hormone causes changes in the uterus that make it more suitable for implantation of the fertilized ovum and the nourishment of the embryo. if the egg is not fertilized, the corpus luteum becomes inactive after 10–14 days, and menstruation occurs.

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both male and female gametes are produced by meiosis of the germ cells. therefore, both male and female gametes are haploid. one male and one female gamete unite during the fertilization to form the diploid zygote. in seed bearing plants, pollen grain is the male gametophyte, which produces sperm cells.

. ph changes the ability of them he enzyme to dissolve in water.