The hormone prolactin, found in distantly related vertebrates, exerts different effects in different species. From an evolutionary standpoint, this is an indication that prolactin

A) can only have functions related to childbirth.
B) is an ancient hormone whose function diversified through evolution.
C) was a recent evolutionary adaptation.
D) was not required in fish and amphibians.


Answer: B

Biology & Microbiology

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Each skeletal muscle cell constitutes a single

A. motor unit. B. muscle fiber. C. sarcolemma. D. myofibril. E. sarcomere.

Biology & Microbiology

Which of the following statements about energy metabolism is false?

-The energy that powers living systems ultimately comes from the sun. -All animals in some way rely on producers for their energy. -Plants provide the water and carbon dioxide that animals need to carry out cellular respiration. -Most eukaryotic organisms carry out cellular respiration in the presence of oxygen. -The main objective of cellular respiration is to break down glucose and make ATP.

Biology & Microbiology

Joan and her doctor notice a suspicious lump in her breast. Joan also has a family history of breast cancer. Which of the following is not a likely next step as they work to determine the cause of the lump?

A. performing a diagnostic mammogram B. genetic testing for mutations in the BRCA1 gene C. taking a biopsy of the lump to look for the presence of cancer cells D. performing a mastectomy to remove all breast tissue in that breast

Biology & Microbiology

When atoms react to form an ionic bond, electrons are shared between those atoms

__________________ Indicate whether the statement is true or false.

Biology & Microbiology