*Question*
Q: Where do carrier proteins carry ions or molecules? Choices: - between nuclei - across isotopes - back to nucleus - across the membrane A:
**Answer**
across the membrane

*Question*
Q: What regulates the cell cycle only when they are tightly bound to cdks? Choices: - kinases - subclades - hormones - cyclins A:
**Answer**
cyclins

*Question*
Q: The structure of the human tail bone is called what? Choices: - a abnormal structure - a vital structure - an artifact - a vestigial structure A:
**Answer**
a vestigial structure

*Question*
Q: What external feature in human beings is responsible for balance? Choices: - tails - brain - hands - ears A:
**Answer**
ears