Ciliate sexual reproduction by conjugation differs from sexual reproduction in most animals in that ________.
A. cell fusion occurs during fertilization
B. the zygotic nucleus is diploid
C. meiosis occurs in both partners
D. both parents are converted into zygotes
Answer: D
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Darnell and Tinaka are each carriers of an autosomal recessive disorder that is lethal in early childhood. They want to have a child who is free of the disease, so they have preimplantation genetic diagnosis. Unfortunately, their child has the disease. A scientific explanation is that
A) the blastomere that was tested had undergone a somatic mutation, making it not representative of the rest of the embryo. B) Darnell was not really the father. C) the 7 cells of the remaining embryo each underwent a mutation, so the sampled cell was not representative. D) Darnell or Tinaka is really homozygous recessive, and not heterozygous.
Which type of glial cells is involved in the production of cerebrospinal fluid?
a. satellite glia b. astrocytes c. ependymal cells d. Schwann cells
Gametes contain
A. two different sets of chromosomes. B. two chromosomes. C. one chromosome. D. one set of chromosomes. E. two identical sets of chromosomes.
You decide to repeat the Meselson-Stahl experiment, except this time you plan to grow the E. coli cells on light 14N medium for many generations and then transfer them to heavy 15N medium and allow them to grow for 2 additional generations (2 rounds of DNA replication). If the conservative model of DNA replication was correct, what is the expected distribution of DNA in the density gradient after two rounds of replication?
A. One band of light density. B. One band of intermediate density. C. One band of light density and one band of intermediate density. D. One band of light density and one band of heavy density. E. One band of heavy density.