Human embryonic stem cells that are used in research are
A) cultured in the bodies of human embryos from outer cell mass cells.
B) cultured in laboratory dishes from inner cell mass cells taken from a very early embryo.
C) taken from aborted human fetuses between 10 and 12 weeks of gestation.
D) taken from stillbirths that do not have genetic diseases.
B) cultured in laboratory dishes from inner cell mass cells taken from a very early embryo.
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If a particular trait has three phenotypes and one phenotype represents an intermediate, this
trait displays __________.
a. incomplete dominance b. codominance c. recessive alleles d. dominant alleles
After conjugation between an F+ cell and an F- cell, is the F- cell F- or F+? After conjugation between
an Hfr cell and an F- cell, is the F- cell F- or F+? Explain each answer.
What will be an ideal response?Which of the following statements about the nitrogen cycle is true?
A) The nitrogen cycle requires different types of bacteria. B) Nitrogen gas is converted to nitrates in plant leaves. C) Nitrogen cannot be cycled through living organisms. D) When plants and animals die, nitrogen is removed from the nitrogen cycle
A new community that develops in a disturbed site where the soil that supported a previous community remains is known as ________.
Fill in the blank(s) with the appropriate word(s).