Biology Chapter 2 Questions

Front

About 25 of the 92 natural elements are known to be essential to life. Which 4 of these 25 elements make up approximately 96% of living matter?

Back

carbon, hydrogen, nitrogen, oxygen

Front

Trace elements are those required by an organism in only minute quantities. Which of the following is a trace element that is required by humans and other vertebrates, but not by other organisms such as bacteria or plants? calcium, iodine, sodium, phosphorus

Back

iodine

Front

Which of the following statements is TRUE?
Carbon, hydrogen, oxygen, and calcium are the most abundant elements of living matter.
Some naturally occurring elements are toxic to organisms.
All life requires the same essential elements.
A patient suffering from a goiter should not consume seafood.

Back

Some naturally occurring elements are toxic to organisms.

Front

Which of the following are compounds? H2O, O2, and CH4

Back

H2O and CH4, but not O2

Front

Atoms have no electric charge because they have _______.

Back

an equal number of protons and electrons

Front

An ion with six protons, seven neutrons, and a charge of 2+ has an atomic number of _______.

Back

six

Front

Molybdenum has an atomic number of 42. Several common isotopes exist, with mass numbers from 92-100. Which of the following can be true? Molybdenum atoms can have between 50 and 58 neutrons.

Back

Molybdenum atoms can have between 50 and 58 neutrons.

Front

Carbon-14 has the same _______.

Back

number of protons but more neutrons than carbon-12

Front

A(n) _______ has charge but negligible mass, whereas a(n) _______ has mass but no charge.

Back

electron; neutron

Front

The atomic number of nitrogen is 7. Nitrogen-15 has a greater mass number than nitrogen-14 because the atomic nucleus of nitrogen-15 contains _______.

Back

8 neutrons