Which of the following statements is false?
A. The cells of the epiblast and hypoblast
differentiate into the three germ layers.
B. The inner cell mass of the blastocyst forms
the embryo.
C. The outer layer of cells of the blastocyst
forms the placenta.
D. The placenta is composed of both
maternal and embryonic cells.
E. None of the answer options is false.
A
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Which one of the following statements does not accurately describe segregation of the sex chromosomes?
A. In human males, segregation of the X chromosome from the Y chromosome occurs during anaphase I of meiosis. B. In humans, half of the fertilized eggs are expected to be male and half are expected to be female; this 1:1 ratio is characteristic of Mendelian segregation. C. The secondary sex ratio of males to females at birth usually shows a slight excess of males. D. In humans, the sex at each birth is not a random process because there are often large families with either all girls or all boys. E. Females are slightly less likely to survive from conception to birth, but males are slightly less likely to survive from birth to reproductive maturity.
Describe the cellular and molecular function of the ras gene family and the consequences of mutations in ras
What will be an ideal response?
Which of the following would be a primary consumer?
A. tree B. decomposer C. carnivore D. herbivore
Organs that are commonly affected by drug toxicity include the kidneys and the liver.
Answer the following statement true (T) or false (F)