Biology Fundamentals
Which of the following levels of biological organization is arranged from most complex to least complex?
A) Organism, molecules, cells, organs
B)Organism, cells, organs, molecules
C) Molecules, cells, tissues, organs
D) Organism, organs, tissues, molecules
D) Organism, organs, tissues, molecules
All of the following are true of ionic bonds except:
A) Atoms that gain an electron are called anions
B) Electrons are completely transferred during bonding
C) Atoms gain partial charges as a result of the transfer of electrons
D) Cations are positively charged ions
C) Atoms gain partial charges as a result of the transfer of electrons
a) Which is more acidic?
b) How much more?
a) 2 is more acidic
b) 1,000,000x
The ability of glucose and other hydrophillic substances to dissolve in water describes which of the four properties of water?
Water's versatility as a solvent
In a hydrolysis reaction, a water molecule is ______
to convert _______ into _______.
A. added; monomers; polymers
B: added; polymers; monomers
C. removed; monomers; polymers
D. removed; polymers; monomers
D. removed; polymers; monomers
Rosa virginia (Virginia Rose) is a common type of wild rose native to eastern North America.
What is the genus and species of this organism? Also include which domain and kingdom it belongs to.
Genus: Rosa
Species: virginia
Domain: EUKARYA
Kingdom: Plantae
True/ False: The formation of nonpolar covalent bonds will result in partial charges of both atoms
FALSE!!!
An aqueous solution has a hydrogen ion concentration of 10-9. Calculate the OH- and pH. Is this solution acidic or basic?
OH- = 10-5
pH= 9
This solution is BASIC
Hydrocarbons
An individual water molecule is held together by which type of bond?
*For full points, include which atom is more electronegative and their charges*
POLAR COVALENT BOND
O2 is more electronegative
Oxygen gains a partial negative charge
Hydrogen gains a partial positive charge
Sweating to maintain a stable internal environment when it's too hot represents which property of life?
A) Growth and Development
B) Energy Processing
C) Regulation
D)Response to the environment
C) Regulation
How many pairs of electrons are shared in a double covalent bond?
*Is CO2 an example of a double covalent bond?
2 pairs of electrons
YES :)
Adding a base to a solution tends to _______.
A) Increase the H+ concentration and raise the pH
B) Decrease the H+ concentration and raise the pH
C) Increase the H+ concentration and lower the pH
D) Decrease the the H+ concentration and lower the pH
B) Decrease the H+ concentration and raise the pH
Isomers that are mirror images of each other are called ______
Enantiomers
Glucose: C6H12O6 is a ______
A) molecule
B) compound
C) element
D) All of the above
molecule and a compound
Humans have modified other species by selecting and breeding individuals with desired traits through a process called _______
Artificial Selection
We can represent atoms by listing the number of protons, neutrons, and electrons. For example 2p+, 2n0, 2e- for helium. Which of the following represents the 18O isotope of oxygen?
A) 7p+,2n0, 9e-
B) 8p+, 10n0, 8e-
C) 9p+, 9n0, 9e-
D) 10+, 8n0, 9e-
B) 8p+, 10n0, 8e-
In a solution where there is more OH- than H+, a buffer will ______
A) Have no effect in the solution
B) Reversibly bind H+ to OH
C) Release NaCl
D) Release more H+
D) Release more H+
Na+Cl-, a polar molecule is added into an aqueous solution.
A) How will NaCl react with water
B) Is this molecule hydrophillic or hydrophobic?
dissolve; water will form hydration shells around the two atoms
HYDROPHILLIC
Which of the following is true of saturated hydrocarbons?
A. it is saturated with double bonds
B. it contains no double bonds
C. it contains no hydrogens
D. it contains no carbons
B. it contains no double bonds
Johnny had a body temperature of 100.6 ℉, resulting in a fever, thus moving the system away from homeostasis. This is an example of _______
Positive feedback loop
Determine whether the molecule Hydrogen Flouride (HF) is polar/ nonpolar based on the electronegativity of both atoms
H- 2.2
F- 4.0
POLAR
4.0- 2.2=1.8
> 0.5 is polar
< 0.5 is nonpolar
In the chemical reaction:
H2O + NH3 ----> OH- +NH4+
Which of the reactants is an acid and which one is a base?
Acid: H2O donating it's H+ to NH3
Base: NH3 accepting the H+ from H2O
Name the following functional groups and determine if they are polar/ nonpolar
-OH, -CH3 , -COOH, -NH2
-OH = Hydroxyl; polar
-CH3 =Methyl; nonpolar
-COOH =Carboxyl; polar
-NH2 = Amino; polar
Measurements show that the pH of a particular lake is 4.0. What is the hydrogen and hydroxide concentration of the lake?
H+ =10-4
OH- = 10-10