The importance of crossing over during meiosis is
a. to hold homologous pairs of chromosomes together.
b. to result in chromosomes consisting of two identical sister chromatids.
c. to result in daughter nuclei with too much or too little genetic material.
d. to ensure that the developing zygote receives cytoplasm from one of the parents.
e. to allow formation of parental chromosomes.
A
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During the development of the vulva in Caenorhabditis, when the Notch ligand binds a Notch receptor on a progenitor cell:
A. signal transduction results in activation of a set of transcription factors. B. genes that produce the Notch ligand are transcribed. C. genes that produce the Notch receptor are inhibited. D. genes that produce the EGF receptor are inhibited. E. None of these choices are correct.
To prevent swollen thyroid glands, many nations add iodine to
A. milk. B. soda pop. C. salt. D. processed meats. E. orange juice.
How is DNA linked to the production of proteins?
A) Proteins hold the instructions on how to make DNA. B) DNA is the end point of protein production that allows cells to finish making proteins. C) DNA holds the instructions for the cells on how to make proteins. D) DNA is not linked to the production of proteins.
"P" is the chemical symbol for
A. nickel. B. potassium. C. plutonium. D. phosphorus. E. copper.