1. A fertilizer and seed company located in Prince George’s County claims that their fertilizer causes rose bushes to produce more flowers. To support this claim, they set up an investigation. They added the recommended amount of fertilizer to 100 rose bushes in a greenhouse and then counted the number of flowers that bloomed on each bush. The number of flowers on each rose bush ranged from 28 to 36. The average number of flowers on each bush was 33. A gardener was skeptical of the company’s claim. Which statement provides the best reason to be skeptical about this investigation?
*
5 points
a. The sample size was too small to be valid.
b. The investigation tested only one variable.
c. The investigation was conducted without a control.
d. The investigation was conducted only on rose plants.
2. Intestinal lactase deficiency leads to lactose maldigestion which subsequently can lead to lactose intolerance, i.e. causing clinical symptoms. Infants and children normally express sufficient lactase levels and do not experience clinical symptoms. Overall, adults can be classified as individuals who are lactase persistent or lactose intolerant. The graph below shows the percent of people who are lactose intolerant in various countries. What is the approximate percentage of individuals who are lactase persistent in the US?
a. 45-50%
b. 80-90%
c. 10-15%
d. 30-35%
3. In your family, lactose intolerance is very common. At a recent holiday holiday gathering (reunion), you noticed that several family members were using the bathrooms after dinner. What part of the scientific process is this?
a. conclusion
b. hypothesis
c. observation
d. experimenting
4. Knowing that your family members are lactose intolerant, you presume that they may have eaten food containing dairy products at the party. What part of the scientific process is this?
a. conclusion
b. hypothesis
c. observation
d. experimenting
5. Based on the data, which food do you think caused stomach upset (malestar) of some family members in the gathering (reunion) to use the bathroom after dinner?
a.bread
b.carrots
c.green beans
d.macaroni & cheese
6. A researcher is comparing fatty acid molecules with that of amino acid molecules. Which of these statements is true about amino acids, but NOT about fatty acids?
a.always contain carbon
b.always contain oxygen
c.always contain nitrogen
d.always contain hydrogen
7.You and a partner have brainstormed a design for an implanted device to help keep insulin levels in check for a person who is diabetic. What should be the next step in the design process?
a.Test on a patient
b.Build a prototype
c.Revise the design
d.Evaluate the design
8.A transportation engineer involved in designing a traffic light system for an intersection is most likely to conduct a vehicle count at the intersection during which of the following stages of the engineering design process?
a.gathering information
b.analyzing the solution
c.generating multiple solutions
d.selecting an appropriate solution
10.Atoms connected by covalent bonds share ____________.
a.hydrogen ions
b.ionic compounds
c.pairs of electrons
d.carbon and oxygen
11.Which element are many of the molecules composing living things based on?
a.carbon
b.iron
c.nitrogen
d. potassium
12.The diagram shows the particles that make up an atom. What is the name of the negatively charged particles shown in this model of an atom? Choose the correct answer.
a.prions
b.protons
c.neutrons
d.electrons
13.Which of these describes the structure of a nucleic acid? Select the correct answer.
a. a long chain of monosaccharides
b. a chain of monomers composed of a sugar, a phosphate group and a base
c.several fatty acids linked together
d. a hydrophilic head containing a glycerol and two hydrophobic tails
14.Which of these describes a polymer? Choose the correct answer.
a. a large molecule made of smaller subunits
b. a molecule with a polar head and nonpolar tails
c. a moleculecomposed of hydrogen, carbon and oxygen
d. a molecule that catalyzes a reaction in living organisms
What substance is composed on only one type of atom?
a. cell
b. element
c. water
d. compound
15. Which of these includes sugars and starches?
a. proteins
b. carbohydrates
c. phospholipids
d. unsaturated fatty acids
16. What is the main function of phospholipids in a cell?
a. produce energy for the cell
b. contain genetic information
c. form the cell membrane
d. increase the rate of reactions
17. Based on evidence from the images, which statement about the bonding of carbon atoms is NOT true?
a. Carbon has the ability to form up to four bonds.
b. Carbon containing compounds must contain double bonds.
c. Carbon has the ability to bond with other atoms besides carbon.
d. Carbon atoms can sometimes form ring structures when they bond.
18.The image below represents: _______________ because a double bond is present between the carbon atoms.
a. unsaturated fat
b. saturated fat
19.What is the name for the basic building blocks of polymers?
a. proteins
b. macromolecules
c. monomers