BIOLOGY
Which organ of the respiratory system is the main site of gas exchange between oxygen and carbon dioxide?
Alveoli
What do we call an atom that has the same number of protons but a different number of neutrons?
ISOTOPE
At convergent plate boundaries where an oceanic plate is forced beneath another plate, a deep depression forms on the seafloor. What is this underwater feature called?
Trench
Using the visible light spectrum, what is the correct arrangement of colors from lowest to highest energy?
Red, Orange, Yellow, Green, Blue, Indigo, Violet
In pea plants, the allele for tall (T) is dominant over short (t). If two heterozygous tall plants (Tt × Tt) are crossed, what is the probability that their offspring will be short?
25%
The particles in a certain state of matter vibrate in fixed positions and have the strongest intermolecular forces. What state of matter is being described?
Solid
Global climate change is being attributed to the atmospheric increase in what two gases produced by human activities?
A. oxygen and hydrogen
B. ozone and methane
C. nitrous oxide and sulfur dioxide
D. methane and carbon dioxide
D. methane and carbon dioxide
What type of electromagnetic wave has the highest frequency and lowest wavelength?
Gamma Ray/Gamma Waves/Gamma Radiation
What molecule serves as the final electron acceptor in the electron transport chain during aerobic respiration?
Oxygen
The electron configuration of an element is 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹. Using its electron configuration, identify the group number of the atom.
A. Group 1
B. Group 2
C. Group 17
D. Group 18
A. Group 1
The Ring of Fire, known for frequent earthquakes and volcanic eruptions, is located around which ocean?
Pacific Ocean
A javelin thrower must land on its pole at the longest range possible. At what angle must the pole leave the hand of the player?
A. 15°
B. 30°
C. 45°
D. 60°
C. 45°
If one strand of a DNA molecule has the sequence of bases 5′-ATTGCA-3′, what will be the template strand synthesized by the mRNA?
3′-UAACGU-5′
Which of the following elements cannot easily form chemical reactions with other elements because it has a stable electron configuration?
A. Hydrogen
B. Oxygen
C. Neon
D. Nitrogen
C. Neon
During an earthquake, which seismic wave arrives last at a seismic station?
A. S-wave
B. P-wave
C. Rayleigh wave
D. Love wave
C. Rayleigh wave
What are the characteristics of the image formed when the object is located between vertex and focal point in front of a concave mirror?
A. Larger, Inverted, Real
B. Larger, Upright, Virtual
C. Same Size, Inverted, Real
D. Same Size, Upright, Virtual
B. Larger, Upright, Virtual
Which event directly leads to the release of oxygen during photosynthesis?
A. Reduction of NADP⁺
B. Splitting of water molecules in Photosystem II
C. Fixation of CO₂ in the Calvin cycle
D. Excitation of chlorophyll in Photosystem I
B. Splitting of water molecules in Photosystem II
A student stirs salt into water until no more salt dissolves and solid crystals remain at the bottom. What type of solution has formed?
A. Unsaturated solution
B. Saturated solution
C. Supersaturated solution
D. Dilute solution
B. Saturated solution
The Philippine Fault Zone, which runs through most of the Philippine archipelago and causes frequent earthquakes, is what type of fault?
Strike slip fault
What is the correct arrangement of these radiations in increasing frequency: X-rays, radio waves, ultraviolet, infrared?
Radio waves → Infrared → Ultraviolet → X-rays