A solution with a pH of 5 has how many times more protons in it than a solution with a pH of 7?
Which of the following statements correctly described cis-trans isomers?
they have variations in arrangement around a double bond.
Inside a cell, which chemical bond is strongest?
triple covalent bond
Which of the following effects can occur because of high surface tension of water?
a raft spider can walk across the surface of a small pond.
African bombardier beetle has two chambers in its abdomen, which of the following is incorrect?
the two chambers are always connected
One of the buffers that contribute to pH stability in human blood is carbonic acid (H2CO3). Carbonic acid is weak acid that, when placed in an aqueous solution, dissociates into a bicarbonate ion (HCO3-) and a hydrogen ion (H+).
If the pH of blood drops, one would expect...
The HCO3- to act as a base and remove excess H+ by the formation of H2CO3.
Van der Waals interactions may result when___.
electrons are not symmetrically distributed in a molecule
Based on your knowledge of the polarity of water molecules, the solute molecule depicted here is most likely___.
A carbon atom is most likely to form what kind of bond(s) with other atoms?
Which bond or interaction would be difficult to disrupt when compounds are put into water?
covalent bonds between carbon atoms
Prokaryotes are classified as belonging to two different domains. What are the domains?
Bacteria and Archaea
Which of the functional groups acts most like an acid in water?
Bonds between two atoms that are equally electronegative are...
nonpolar covalent bonds
Which of the following are compounds?
H2O and CH4, but not O2
You find yourself standing next to a beautiful rose bush. Which of the following do you and the rose have in common?
You are both multicellular
Which of the following best describes the relationship between the atoms pictured?
They are isotopes
Water has many exceptional and useful properties. Which is the rarest property among compounds?
Solid water is less dense than liquid water
The level of the hierarchy of life that is more inclusive than community is...
Which of the following illustrations is NOT a structural isomer of an organic compound with the molecular formula C6H14? For clarity, only carbon skeletons are shown; hydrogen atoms that would be attached to the carbons have been omitted.
The half-life of C-14 is 5730 years. If a sample contains 8mg of C-14, how long will it take to contain 1mg?
How many electrons are involved in a double covalent bond?
In a single molecule of water, two hydrogen atoms are bonded to a single oxygen atom by...
polar covalent bonds
The figure above shows the structures of glucose and fructose. These two molecules are...
Which of the following types of cells utilize deoxyribonucleic acid (DNA) as their genetic material but do not have their DNA encased within a nuclear envelope?
Which of the following is NOT an organic molecule?
What determines whether a carbon atom's covalent bonds to other atoms are in a tetrahedral configuration or a planar configuration?
the presence or absence of double bonds between the carbon atom or other atoms
The two dynamics of the biosphere are...
cycling of chemicals and flow of energy
About twenty-five of the ninety-two natural elements are known to be essential to life. Which four of these twenty-five elements make up approximately 96 percent of living matter?
carbon, hydrogen, nitrogen, oxygen
Which of the following is the best description of a control for an experiment?
the control group is matched with the experimental group except for one experimental variable
In comparison to eukaryotes, prokaryotes...
Which of the pairs of molecular structures shown below depict enantiomers of the same molecule?
In what way are elements in the same column of the periodic table the same?
They have the same number of electrons in their valence shells when neutral
Which of the structures illustrated above is an impossible covalently bonded molecule?
Nitrogen (N) is more electronegative than hydrogen (H). Which of the following is a correct statement about the atoms in ammonia (NH3)?
each hydrogen atom has a partial positive charge; the nitrogen atom has a partial negative charge
The element present in all organic molecules is...
Which of the following can be attributed to water's high specific heat?
a lake heats up more slowly than the air around it
A localized group of organisms that belong to the same species is called a
characteristic of prokaryotic and eukaryotic organisms
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?
consider the following reaction at equilibrium CO2+H2O --> <--H2CO3. What would be the effect of adding additional H2CO3?
it would drive the equilibrium dynamics to the left.
Which of the following types of cells utilize deoxyribonucleic acid (DNA) as their genetic material and have their DNA encased within a nuclear envelope?