NLN NEX Science section Exam 2
Question and Answers Latest Version
Top Rated A+
### Biology Questions
*1. Which process allows a cell to move molecules from low to high
concentration using energy?*
A. Diffusion
B. Osmosis
C. Active transport
D. Facilitated diffusion
*Answer: C. Active transport*
Explanation: Active transport requires ATP to move substances against
their concentration gradient (e.g., sodium-potassium pump). Passive
processes like diffusion and osmosis move down the gradient without
energy.
*2. During which phase of mitosis do sister chromatids separate and
move to opposite poles?*
A. Prophase
,B. Metaphase
C. Anaphase
D. Telophase
*Answer: C. Anaphase*
Explanation: In anaphase, the centromeres split, and microtubules pull
sister chromatids apart, ensuring each daughter cell gets identical
chromosomes.
*3. What is the primary role of chlorophyll in plants?*
A. Absorb light energy for photosynthesis
B. Transport water through the xylem
C. Store glucose as starch
D. Protect against herbivores
*Answer: A. Absorb light energy for photosynthesis*
Explanation: Chlorophyll in chloroplasts captures sunlight to convert
CO₂ and H₂O into glucose and oxygen.
*4. Which of the following is a producer in an ecosystem?*
A. Mushroom
B. Deer
C. Grass
,D. Bacteria
*Answer: C. Grass*
Explanation: Producers (autotrophs) like plants make their own food via
photosynthesis. Consumers eat others; decomposers break down
matter.
*5. In DNA, which base pairs with adenine?*
A. Guanine
B. Cytosine
C. Thymine
D. Uracil
*Answer: C. Thymine*
Explanation: A pairs with T (two hydrogen bonds); C pairs with G (three
bonds). Uracil replaces thymine in RNA.
*6. What is the function of ribosomes?*
A. Energy production
B. Protein synthesis
C. Lipid storage
D. Waste elimination
, *Answer: B. Protein synthesis*
Explanation: Ribosomes (free or on rough ER) translate mRNA into
polypeptide chains.
*7. Which term describes an organism that causes disease?*
A. Pathogen
B. Vector
C. Host
D. Symbiont
*Answer: A. Pathogen*
Explanation: Pathogens include bacteria, viruses, fungi, and parasites
that disrupt normal function.
### Human Anatomy & Physiology Questions
*8. The functional unit of the kidney responsible for filtration is the:*
A. Nephron
B. Alveolus
C. Neuron
D. Villus
*Answer: A. Nephron*
Question and Answers Latest Version
Top Rated A+
### Biology Questions
*1. Which process allows a cell to move molecules from low to high
concentration using energy?*
A. Diffusion
B. Osmosis
C. Active transport
D. Facilitated diffusion
*Answer: C. Active transport*
Explanation: Active transport requires ATP to move substances against
their concentration gradient (e.g., sodium-potassium pump). Passive
processes like diffusion and osmosis move down the gradient without
energy.
*2. During which phase of mitosis do sister chromatids separate and
move to opposite poles?*
A. Prophase
,B. Metaphase
C. Anaphase
D. Telophase
*Answer: C. Anaphase*
Explanation: In anaphase, the centromeres split, and microtubules pull
sister chromatids apart, ensuring each daughter cell gets identical
chromosomes.
*3. What is the primary role of chlorophyll in plants?*
A. Absorb light energy for photosynthesis
B. Transport water through the xylem
C. Store glucose as starch
D. Protect against herbivores
*Answer: A. Absorb light energy for photosynthesis*
Explanation: Chlorophyll in chloroplasts captures sunlight to convert
CO₂ and H₂O into glucose and oxygen.
*4. Which of the following is a producer in an ecosystem?*
A. Mushroom
B. Deer
C. Grass
,D. Bacteria
*Answer: C. Grass*
Explanation: Producers (autotrophs) like plants make their own food via
photosynthesis. Consumers eat others; decomposers break down
matter.
*5. In DNA, which base pairs with adenine?*
A. Guanine
B. Cytosine
C. Thymine
D. Uracil
*Answer: C. Thymine*
Explanation: A pairs with T (two hydrogen bonds); C pairs with G (three
bonds). Uracil replaces thymine in RNA.
*6. What is the function of ribosomes?*
A. Energy production
B. Protein synthesis
C. Lipid storage
D. Waste elimination
, *Answer: B. Protein synthesis*
Explanation: Ribosomes (free or on rough ER) translate mRNA into
polypeptide chains.
*7. Which term describes an organism that causes disease?*
A. Pathogen
B. Vector
C. Host
D. Symbiont
*Answer: A. Pathogen*
Explanation: Pathogens include bacteria, viruses, fungi, and parasites
that disrupt normal function.
### Human Anatomy & Physiology Questions
*8. The functional unit of the kidney responsible for filtration is the:*
A. Nephron
B. Alveolus
C. Neuron
D. Villus
*Answer: A. Nephron*
