BIO 109 QUIZ 1

The difference in pH units between two acidic solutions is three (like pH 2 to pH 5). How much more acidic is the stronger acid than the weaker acid?

1000 more acidic

An atom of carbon has an atomic number of 6 and an atomic weight of 12. How many neutrons are in a typical carbon atom?

6

Carbon has the atomic number of 6 and an atomic weight of 12. How many protons are in a typical carbon atom?

6

Which best describes how charges are distributed on a water molecule?

The oxygen end is negative relative to the end with the two hydrogen atoms.

Water striders are common insects that can skip across the surface of ponds and streams. This lifestyle is possible by water's ___

cohesion and resulting surface tension.

Which of the following is not a characteristic of life?

All living things eat other organisms to gain energy

Which of the following groups in the classification hierarchy has members that are the most closely related?

Genus

Skin is sometimes referred to as the largest organ of the body. Why is skin considered to be an organ and not a tissue or some other structure?

Skin consists of multiple tissue types that cooperate to perform a specific task.

In chemical bonding, when the bonded atoms share electrons, it is specifically called

a covalent bond

The 2+ in Cu2+ tells us that this atom

has two more protons than electrons