B.L.A.; occasionally A.L.B. Bachelor of Liberal Arts Natural Sciences 1 — Questions and Answers
Question 1: Charles Darwin's theory of natural selection proposes that organisms evolve through which mechanism?
- Heritable variations that improve survival and reproduction are passed to offspring over generations (Correct answer)
- Organisms consciously adapt to their environment during their lifetime
- Random mutations are randomly selected regardless of fitness
- Environmental pressures cause direct genetic changes in individuals
Correct answer: Heritable variations that improve survival and reproduction are passed to offspring over generations
Natural selection is the process by which heritable traits that increase survival and reproductive success become more common in a population over time.
Question 2: In chemistry, the pH scale measures which property of a solution?
- The concentration of hydrogen ions, indicating acidity or alkalinity (Correct answer)
- The temperature at which a solution boils
- The electrical conductivity of dissolved substances
- The density of particles dissolved in the solution
Correct answer: The concentration of hydrogen ions, indicating acidity or alkalinity
pH measures the concentration of hydrogen ions (H⁺) in a solution, ranging from 0 (most acidic) to 14 (most basic/alkaline), with 7 being neutral.
Question 3: Which of the following best describes the function of DNA in living organisms?
- DNA stores and transmits genetic information that directs the synthesis of proteins (Correct answer)
- DNA provides energy for cellular processes through metabolic reactions
- DNA forms the structural framework of cell membranes
- DNA catalyzes biochemical reactions as an enzyme
Correct answer: DNA stores and transmits genetic information that directs the synthesis of proteins
DNA is the molecule that encodes genetic information in sequences of nucleotides, which is used to direct protein synthesis and control cell function.
Question 4: Newton's First Law of Motion (the law of inertia) states which principle?
- An object at rest stays at rest and an object in motion stays in motion unless acted upon by an external force (Correct answer)
- Force equals mass times acceleration
- For every action there is an equal and opposite reaction
- Objects in free fall accelerate at the same rate regardless of mass
Correct answer: An object at rest stays at rest and an object in motion stays in motion unless acted upon by an external force
Newton's First Law states that objects resist changes to their state of motion — they won't start, stop, or change direction without an external net force.
Question 5: The scientific method begins with which fundamental step?
- Making an observation and formulating a question to investigate (Correct answer)
- Developing a hypothesis to test
- Conducting a controlled experiment
- Collecting and analyzing data
Correct answer: Making an observation and formulating a question to investigate
The scientific method begins with observation of a phenomenon, which leads to a question that the researcher seeks to answer through systematic investigation.
Question 6: In ecology, a 'food chain' illustrates which relationship between organisms?
- The transfer of energy from producers to consumers through a series of feeding relationships (Correct answer)
- The competition between species for the same ecological niche
- The symbiotic relationships between organisms in an ecosystem
- The geographic distribution of species across a habitat
Correct answer: The transfer of energy from producers to consumers through a series of feeding relationships
A food chain shows the sequential transfer of energy from plants (producers) through herbivores, carnivores, and decomposers.
B.L.A.; occasionally A.L.B. Bachelor of Liberal Arts Natural Sciences 1
Charles Darwin's theory of natural selection proposes that organisms evolve through which mechanism?