Signaling by the steroid hormone estrogen is an example of _______ signaling.
a. autocrine
b. endocrine
c. paracrine
d. direct cell-to-cell
Ans: b. endocrine
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Steroid hormomes are an example of an effector which regulates regulatory transcription factor activity
Indicate whether the statement is true or false
Hillary is 8 years old and has neuronal ceroid lipofuscinosis, also known as Batten disease. It is autosomal recessive. She was fine until age five, when she began to lose her vision and stumble. She had learning difficulties in school and was diagnosed at age six. Hillary may only live into her twenties, experiencing dementia and seizures. Her younger brother Jaden, age six, is healthy, as are her parents. The probability that Jaden is a heterozygote is
A) 1/8. B) 1/4. C) 1/3. D) 2/3.
Afterbirth refers collectively to:
a. the fetus and the placenta. b. the fetus and the surrounding fetal membranes. c. the fetus and the umbilical cord. d. the placenta and the fetal membranes. e. the fetus, the umbilical cord, and the placenta.
Which of the follow could occur if a cell cycle checkpoint was missed?
A) The cell cycle would be arrested until the error could be corrected. B) An unreplicated chromosome could be put through mitosis. C) Cohesin could not function correctly. D) DNA would mutate during G2. E) The spindle apparatus would not form.