Where does a fertilized egg attach?
A. Ovary
O
O
B. Cervix
O
C. Fallopian tube
O
D. Uterus
SUBM

D). Uterus

Explanation: Fertilization occurs in the fallopian tube. Fertilization is the fusion of a sperm and an egg to form a zygote. The zygote moves down the fallopian tube to the uterus where it gets embedded into the wall of the uterus. Its attachment to the uterine wall enables the embryo to develop. If the embryo fails to attach itself to the wall of the uterus, the pregnancy will be aborted.

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step 1: initiation

initiation is the beginning of transcription. it occurs when the enzyme rna polymerase binds to a region of a gene called the promoter. this signals the dna to unwind so the enzyme can ‘‘read’’ the bases in one of the dna strands. the enzyme is now ready to make a strand of mrna with a complementary sequence of bases.

step 2: elongation

elongation is the addition of nucleotides to the mrna strand. rna polymerase reads the unwound dna strand and builds the mrna molecule, using complementary base pairs. there is a brief time during this process when the newly formed rna is bound to the unwound dna. during this process, an adenine (a) in the dna binds to an uracil (u) in the rna.

step 3: termination

termination is the ending of transcription, and occurs when rna polymerase crosses a stop (termination) sequence in the gene. the mrna strand is complete, and it detaches from dna.