Statements: (1) in Outer Space, an Astronaut May Be Weightless

question 24

Multiple Choice

Statements: (1) In outer space, an astronaut may be weightless but never massless.
(2) The metric system prefixes milli and micro differ in mathematical meaning by a factor of 1000.
(3) The addition of 273 to a Fahrenheit temperature reading will convert it to a Kelvin temperature reading.

• A) All three statements are true.
• B) Two of the three statements are true.
• C) Only one of the statements is true.
• D) None of the statements is true.

---

Definitions:

Molecules

Groups of two or more atoms held together by chemical bonds, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.

Active Site

A specific region of an enzyme (generally near the surface) that accepts one or more substrates and catalyzes a chemical reaction. Compare with allosteric site.

Enzyme Molecule

A biological catalyst that speeds up the rate of chemical reactions in cells without being consumed in the process.

Substrate

A substance on which an enzyme acts; a reactant in an