Biology Test 1-MCC-STUDY FOR FINAL

A chlorine atom has 17 protons and 18 neutrons. what is its atomic mass?

35amu

Which of the following describes an amphipathic molecule?

A phospholipid with both a hydrophobic and a hydrophilic end

which statement best describes the cell theory?

All living organisms are composed of basic units called cells

Which statement best describes autotrophic organisms?

Autotrophs synthesize macromolecules from CO2, water and energy

How can we identify a particular element?

By its number of protons

A beta-pleated sheet is an example of a protein's territory structure. (true/false)

False

A combination of adhesive and cohesive forces accounts for surface tension. (true/false)

False

A pyrimidine is a double-ring molecule. (true/false)

False

An example of an anion is K. (true/false)

False

Since a carbon atom has 4 valence electrons, it can complete its valence shell by forming a total of 4 hydrogen bonds. (true/false)

False

Identify three of the five basic themes in biology: I. The cellular composition of life II. The evolution of life III. The interactions of living systems IV. The mechanisms of disease V. The transmission of information.

II, III, V

What are compounds that have the same molecular formulas but different structures and different molecules?

Isomers

Which process is most directly associated with the theory of evolution?

Populations changing over time

Which is a benefit of sexual reproduction over asexual reproduction?

The interaction of genes from both parents allows genetic variation

Which is a property of unsaturated fats?

They are generally liquid at room temperature.

Which statement about van Der Wall interactions is false?

They are very strong

An atom that has a filled valence shell is stable and unreactive. (true/false)

True

Cellulose is the main structural component of the walls that surround plant cells. (true/false)

True

When tissues organize, what do they form?

an organ

What differentiates an organic compound from an inorganic compound?

an organic compound contains carbon

What is the smallest chemical unit that retains the characteristic properties a given element?

atom

The helical coil shape of an a-helic fibrous protein provides what type of property to that protein?

elasticity

How many covalent bonds are formed by carbon atoms, producing a wide variety of molecular shapes and sizes?

four

When we know what kinds of ____ are present in an organic compound, we can predict its chemical behavior.

functional groups

Information in living organisms is transmitted by which mechanism(s)?

genes, hormones, and neurotransmitters

What carbohydrate energy storage molecule is found in animal liver and muscle cells?

glycogen

Which of the following is a purine base found in nucleotides?

guanine

The cohesiveness between water molecules is due largely to _____.

hydrogen bonds

Sugar dissolves readily in water because it is a(n) ____ substance.

hydrophilic

The primary purpose of homeostasis is to:

maintain a constant internal environment

In living organisms, chemical reactions responsible for growth, repair, and nutrition are collectively referred to as:

metabolism

Isotopes differ from each other with respect to the number of:

neutrons only

When a nucleic acid undergoes hydrolysis, the resulting subunits are:

nucleotides

The chemical behavior of an atom is determined most directly by the

number of valence electrons

Unlike lipids, hydrophilic functional groups typically contain ____ atoms, which make them more soluble in water.

oxygen

Which of the following atoms can form five covalent bonds?

phosphorous

Which carbohydrate is the most structurally complex?

polysaccharide

All of the members of the same species occupying the same area at the same time constitute:

population

By definition, an organism that is eukaryotic.

possesses a nucleus

Which sequence represents the pattern of energy flow within an ecosystem?

producers-> consumers-> decomposers

Which cells do not have a nucleus or other membrane-enclosed organelles?

prokaryotic cells

The representation H-O-H is known as a(n)

structural formula

Glucose and fructose are _____ because they have identical molecular formulas but their atoms are arranged differently.

structural isomers

Which event illustrates evaporative cooling?

sweat evaporating from the skin

Why are hydrocarbons considered hydrophobic?

the covalent bonds between hydrogen and carbon are nonpolar

A molecule of a saturated triacylgqcerol contains

the maximum number of hydrogen atoms in the fatty acid chains

Which of the following describes the tertiary structure of a protein molecule?

three-dimensional shape of an individual polypeptide chain

Which stimulus most directly causes the Venus flying to catch an insect?

touch

Which of the following fatty acids include one or more adjacent pairs of carbon atoms joined by a double bond?

unsaturated fatty acids

What substance is removed during a condensation reaction?

water