The muscles of a recently deceased human can remain in a contracted state, termed rigor mortis, for several hours, due to the lack of _____
A) ATP needed to break actin-myosin bonds
B) calcium ions needed to bind to troponin
C) oxygen supplies needed for myoglobin
D) sodium ions needed to fire action potentials
A
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Which type of cellular junction allows for the movement of proteins and transfer RNA molecules?
A. desmosomes B. plasmodesmata C. gap junctions D. Answers b and c are both correct.
At the conclusion of mitosis, each daughter cell has ____
a. twice the amount of DNA and half the cytoplasm of the parent cell b. DNA identical to the parent cell c. half the DNA and half the cytoplasm found in the parent cell d. twice the cytoplasm and the same amount of DNA as the parent cell e. DNA genetically different from the parent cell
Which of the following is characteristic of steroid hormones?
a. They are derived from peptides or proteins. b. They influence the activity of DNA. c. They interact with receptors on the exterior surface of the cell membrane. d. They utilize second messenger systems to produce target tissue actions. e. They produce cAMP molecules in target tissue.
A diuretic is a substance that
What will be an ideal response?