Which of the following are characteristics of cyclins?

a. They are active only when combined with another cyclin molecule.
b. The levels of cyclins remain constant throughout the cell cycle.
c. The levels of cyclins fluctuate throughout the cell cycle.
d. Cyclins add phosphate groups to target proteins.
e. Cyclins remove phosphate groups from target proteins.


C

Biology & Microbiology

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Which of these is an example of the action of an endocrine disruptor?

A) BPA in bottles affects particular glands. B) Feedback from estrogen inhibits FSH. C) Lack of iodine prevents synthesis of adequate thyroid hormone. D) Lowered levels of calcitonin causes increased bone density.

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The cardiovascular system consists of the ________ and ________

Fill in the blank(s) with correct word

Biology & Microbiology

The two main divisions of the skeletal system are:

A) cranial and axial. B) vertebral and appendicular. C) appendicular and cranial. D) appendicular and axial. E) axial and articular.

Biology & Microbiology

The hypothesis that states that eukaryotic organelles are derived from once free living prokaryotes is known as the:

a. prokaryote origins hypothesis. b. organelle hypothesis. c. hybrid hypothesis. d. endosymbiosis hypothesis. e. early life hypothesis.

Biology & Microbiology