Exams & Certification

A group of biologists is studying the competitive relationships among strains of bacteria that exist in the guts of fish. The researchers have constructed a competitive dominance hierarchy diagram for a particular set of conditions (shown below). Under these conditions, which bacterial strain is the LEAST competitively dominant?  The Correct Answer and Explanation is: To […]

Identify a true statement about anorexia nervosa. It begins in late adolescence or early adulthood. ? It is difficult to detect as anorexics fall within a normal weight range. It is about 10 times more likely to occur in females than in males. It occurs when an individual consistently follows a binge-and-purge pattern. The Correct

In a certain economy, jam and bread are produced, and the economy currently operates on its production possibilities frontier. Which of the following events would allow the economy to produce more jam and more bread, relative to the quantities of those goods that are being produced now? a. Unemployed labor is put to work producing

Which of the following defines hypothesis?A. idea that proves a theoryB. means of explaining social phenomenaC. tentative explanationD. way of looking at the world The Correct Answer and Explanation is: Correct Answer: C. tentative explanation A hypothesis is best defined as a tentative explanation for an observation, phenomenon, or scientific problem that can be tested

The horned lizard shoots blood out of its eye as a form of defense. To understand if this defense mechanism improves their survival, biologists went to the field and collected data on 46 horned lizards. After making observations, the biologists recorded that 15 lizards did not survive predatory attack when shooting blood from the eye:

Draw a molecular orbital diagram for the neutral C2 molecule. Label all atomic orbitals and molecular orbitals. Plausible Lewis structures are :C=C: and •C≡C•. Use your molecular orbital diagram to explain which Lewis structure is a better representation. The correct answer and explanation is : Molecular Orbital Diagram for the C₂ Molecule Step 1: Atomic

All matter has physical and chemical properties. which of these describes a chemical property? a. boiling point b. flexibility c. electrical conductivity d. reactivity with water The Correct Answer and Explanation is: Correct Answer: d. reactivity with water Explanation: All matter exhibits both physical and chemical properties. Physical properties are characteristics that can be observed

50.0 g of methanol (CH3OH, molecular mass = 32.04 g/mol) is dissolved to make 500.0 mL of solution. What is the molarity, mol/L, of the resulting solution? Would that be? 32.04/.50 = 64.08 The correct answer and explanation is : To calculate the molarity (mol/L) of a solution, use the formula: Molarity (M)=moles of soluteliters of solution\text{Molarity (M)} = \frac{\text{moles

Grouped frequency distribution? a. None of these b. Class width = \frac{Highest value – lowest value}{sum of frequencies} c. Class width = \frac{Highest value + lowest value}{number of intervals} d. Class width = \frac{Highest value – lowest value}{number of intervals}What is the formula to find the class width(or class interval) in the grouped frequency distribution?

If an effective price ceiling is placed on hamburgers, thenMultiple ChoiceA. The price charged will be below the market-clearing price.B. A black market for hamburgers may evolve.C. The quantity demanded will exceed the quantity supplied.D. All of these choices are correct The Correct Answer and Explanation is: Correct Answer: D. All of these choices are