The chorionic villi eventually form the placenta, a disc-shaped structure that ____
a. releases sex hormones at appropriate times throughout pregnancy
b. initiates uterine contractions
c. binds to the zygote to accelerate organ development
d. nourishes the embryo throughout pregnancy
e. prevents infection by blocking the passage of microorganisms through the cervix during pregnancy
d
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In analyzing the number of different bases in a DNA sample, which result would be consistent with the base-pairing rules?
A) A = G B) A + G = C + T C) A + T = G + T D) A = C E) G = T
In mitosis, the chromosomes move to opposite poles during
a. anaphase. b. metaphase. c. prophase. d. telophase
What is receptor mediated endocytosis
What will be an ideal response?
Which of the following bones is (are) NOT part of the axial skeleton?
A. sternum B. skull C. vertebrae D. scapula E. ribs