The cell in panel 3 in the figure is in ___
a. anaphase
b. metaphase
c. interphase
d. prophase
e. telophase
ANSWER: d
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Steroid hormones bind to receptors inside the cell and alter their conformation. The hormone-receptor complex is then transported into the nucleus, where it can directly affect gene expression. To get from the location where the receptor binds the hormone to its site of action, the hormone-receptor complex must _____.
A) undergo another conformational change B) become water soluble by binding to a carrier molecule C) be transported through the nuclear pore complex D) enter the smooth endoplasmic reticulum
Look at the illustration and think about what you have learned about the regulation of the cell cycle. If Rb were mutated and could not be phosphorylated or bind E2F, which would be a possible outcome?
a. E2F would bind and transcription would proceed.
b. Rb would block transcription and apoptosis would be triggered.
c. Cancer would result due to unchecked cell growth and mitosis.
d. Transcription would be blocked and the cell cycle could not proceed.
What is the long tube through which mature sperm are transported to the urethra during ejaculation?
What will be an ideal response?
Which of the following is the best definition of antagonism?
A. competition for limited resources B. cooperation in utilization of resources C. sharing the same environment without harming each other D. production of products that interfere with the growth of others E. competition and production of products that interfere with growth