1.an attraction between molecules can be called a
select one:
a. polar bond
b. covalent bond
c. ionic bond
d. hydrogen bond
2.the reason water sticks to the inside of a graduated cylinder like the image below is because of
select one:
a. adhesion
b. cohesion
c. polar molecules
d. hydrogen bonding
3.water molecules are composed of
select one:
a. 2 oxygen atoms and 1 hydrogen atom
b. 2 oxygen atoms and 2 hydrogen atoms
c. 1 oxygen atom and 1 hydrogen atom
d. 1 oxygen atom and 2 hydrogen atoms
4.plants are able to absorb water from the ground through their roots because
select one:
a. the atoms in water are ionically bonded together
b. water is considered the universal solvent
c. capillary action causes the water to rise up in tubes
d. water has a high level of surface tension
5.why are water molecules attracted to each other?
select one:
a. when the temperature changes, water molecules move toward each other.
b. polar molecules have partially charged positive and negative ends.
c. the sharing of electrons keeps them stuck together.
d. some molecules are positively charged and others are negatively charged, so opposites attract.
6.water is
select one:
a. an atom
b. a compound
c. an element
d. a mixture
7.water molecules stick to themselves. this is known as
select one:
a. adhesion
b. capillary action
c. cohesion
d. polar molecules
8.how does the high heat capacity of water life exist on earth?
select one:
a. it makes us sweat more.
b. it makes ice float in water.
c. it allows water molecules to stick together.
d. it keeps the air temperature relatively stable.
9.insects such as water striders can walk on water because:
select one:
a. of aerodynamics
b. of surface tension
c. of density
d. of temperature
can be disrupted by the addition of soap into water.
select one:
a. density
b. temperature
c. surface tension
d. density and temperature
11.due to the fact that ice is less dense than water in its liquid
select one:
a. snow falls to the ground
b. ice storms are very dangerous
c. aquatic life can survive in a pond that has frozen over at the surface
d. cars will hydroplane if one drives too fast on a wet roadway

Which of the following is not a main characteristic that scientists focus on when determining which kingdom an organism belongs to

After reading the paragraph below, answer the questions that follow. researchers have created a robot that has a very thin leg that is moved by cardiac (heart) cells contracting in unison. the robot, made of a polymer similar to that used in making contact lenses, is bathed in heart cells with supporting cells, which then attach to the robot and provide movement as they contract. all of the cardiac cells working together can cause the robot leg to move in a way that individual cells could not. this is an example of a. emergent properties of cells. b. energy flow through an ecosystem. c. adaptation. d. internal environment regulation.

For your initial isolation of the bacterium, you simply needed to grow enough of it that you could identify some of its more general features. thus, you used a complex nutrient agar that would allow for the growth of almost any bacterial species. different bacterial species often have very specific requirements for life. this is a fact that you can utilize when you are trying to identify the bacterium to the species level. growth conditions that will permit the growth of one species but not another may allow you to select which one you would like to culture. you can utilize different selective/differential media that allow for the growth of only one type of bacteria (e. g., either gram positive or gram negative). culturing media such as phenylethyl alcohol or sodium chloride agar will be selective/differential for gram-positive bacteria. you may also want to show that it is different from other bacteria that may be present, so you could use a selective/differential agar. selective/differential media such as blood agar or phenol red sugar broths allow for the determination of whether a bacterial cell can grow and utilize specific ingredients included in the medium and turn the agar a distinct color. sheep's blood agar utilizes red blood cells to differentiate which bacterial species may have hemolytic properties. selective or differential? 1. an agar that uses a high salt concentration to limit the growth of one type of bacteria over another would be considered selective/differential. 2. if an agar contains a dye or ph indicator in the presence of a sugar, it is generally considered selective/differential for those bacteria that may ferment the sugar over those that cannot. 3. an agar that uses the dye in crystal violet agar suppresses the growth of gram-positive bacteria. this agar would be considered selective/differential. 4. the selective/differential aspect of macconkey agar allows for the determination of which bacteria are lactose fermenters and which are not. 5. a blood agar plate contains sheep red blood cells and allows for the determination of hemolytic capabilities for all bacteria that grow on the agar. this would make this type of agar selective/differential. 6. emb agar uses lactose and two dyes that allow it to be selective/differential between the blue-black colonies of e. coli and the pinkish colonies of all other enteric bacteria. 7. bile salts in macconkey agar allow for the agar to be selective/differential for the growth of enteric gram-negative bacteria over gram-positive bacteria. 8. an agar that allows for the distinction of bacteria based on metabolism would be considered selective/differential.