This document contains 5 science questions with explanations of the answers. 1. The chemical substances in living systems that catalyze reactions are called enzymes. 2. The homologous pair of body parts is human arms and a seal's flippers, as they have a similar bone structure originating from a common ancestor. 3. Our lips appear redder than our palms because there are many blood vessels located close to the skin surface of the lips, making the blood vessels more visible. 4. A non-renewable resource that has not been developed in the Philippines is the sea, due to limitations, impacts, challenges, and legal complexities regarding its use. 5. The element with an electron configuration of

1. LET GEN. ED
5 RANDOM SCIENCE
QUESTIONS (PART 1)
With 1 slide graphic explanation each
made simple for you
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2. 1. CHEMICAL SUBSTANCES
FOUND IN THE LIVING SYSTEM
THAT CATALYZE CHEMICAL
REACTIONS ARE CALLED ______?
a.Electrolytes
b.Neutralizers
c.Buffers
d.Enzymes

3. 3
ELECTROLYTES NEUTRALIZERS BUFFERS​ ENZYMES​
Electrolytes are
substances that conduct
electricity when
dissolved in water. They
are essential for many
bodily functions,
including nerve and
muscle function, fluid
balance, and acid-base
balance. Example:
•Sodium: helps regulate
fluid balance and blood
pressure, and is
important for nerve and
muscle function.
Buffers are
substances that help
maintain a stable pH
in a solution by
resisting changes in
acidity or alkalinity.
Here are some
examples of buffer
systems:
•Bicarbonate buffer
system: helps
regulate blood pH by
converting excess
hydrogen ions into
carbon dioxide and
water
Enzymes are
proteins that
catalyze chemical
reactions in the
body. They are
essential for many
bodily functions,
including digestion,
metabolism, and
DNA replication.
Example :
•Amylase: breaks
down
carbohydrates into
simple sugars
Neutralizers are
substances or
materials used to
neutralize acidic or
basic solutions. They
are commonly used in
various applications,
such as water
treatment, agriculture,
and chemical spills.
Here are some
examples of
neutralizers:
•Calcium carbonate:
commonly used to
neutralize acidic
water
√
ANSWER: D. ENZYMES

4. 2. WHICH OF THE FOLLOWING
PAIRS OF BODY PARTS IS
CONSIDERED HOMOLOGOUS?
a. Human arms and Seal’s flippers
b. Appendix and tail bone
c. Lungs and gills
d. Ectoderm and endoderm
4

5. ANSWER: A. HUMAN ARMS AND
SEAL’S FLIPPERS
HOMOLOGOUS STRUCTURES ARE STRUCTURES THAT HAVE THE SAME
BASIC ANATOMICAL FEATURES AND EVOLUTIONARY ORIGIN, BUT MAY
HAVE DIFFERENT FUNCTIONS . IN THE CASE OF HUMAN ARMS AND SEAL
FLIPPERS, THEY BOTH HAVE A SIMILAR BONE STRUCTURE, WITH THE
SAME NUMBER AND ARRANGEMENT OF BONES . THIS SUGGESTS THAT
THEY EVOLVED FROM A COMMON ANCESTOR THAT HAD THIS BONE
STRUCTURE, AND THAT THE STRUCTURE WAS MODIFIED OVER TIME TO
SUIT DIFFERENT FUNCTIONS IN DIFFERENT SPECIES.
√

6. 3. WHY ARE OUR
LIPS “REDDER”
THAN OUR PALM?
a. There is increased blood flow in the lips
b. Lips are heavily keratinized
c. Lips epidermis is thinner
d. Many blood vessels are located around the
lips

7. ANSWER: D. MANY BLOOD VESSELS
ARE LOCATED AROUND THE LIPS
7
THE COLOR OF OUR LIPS IS DUE TO THE PRESENCE OF BLOOD
VESSELS CLOSE TO THE SURFACE OF THE SKIN. THE SKIN ON
OUR LIPS IS THINNER THAN THE SKIN ON OUR PALMS, WHICH
MAKES THE BLOOD VESSELS MORE VISIBLE AND GIVES OUR
LIPS A REDDISH HUE . IN CONTRAST, THE SKIN ON OUR PALMS IS
THICKER AND HAS FEWER BLOOD VESSELS, WHICH MAKES
THEM APPEAR LESS RED .
√

8. 4. NON-RENEWABLE RESOURCE
THAT HAVE NOT YET DEVELOPED IN
THE PHILIPPINES.
8
a.Coal
b.Sea
c.Wind
d.Water

9. ANSWER: B. SEA 9
THE SEA IS GENERALLY CONSIDERED A NON-RENEWABLE
RESOURCE THAT IS NOT DEVELOPED DUE TO ITS LIMITED
AVAILABILITY, ENVIRONMENTAL IMPACTS, TECHNICAL
CHALLENGES, AND LEGAL COMPLEXITIES. THE UNITED NATIONS
CONVENTION ON THE LAW OF THE SEA (UNCLOS) PROVIDES A
FRAMEWORK FOR THE MANAGEMENT AND CONSERVATION OF
OCEAN RESOURCES BUT HAS BEEN SUBJECT TO CRITICISM
FOR BEING DIFFICULT TO IMPLEMENT .
√

10. 5. ELEMENT X HAS AN ELECTRON
CONFIGURATION OF 1S² 2S² 2P².
BASED ON THE INFORMATION
GIVEN, ELEMENT X BELONGS TO
A/AN ______ FAMILY.
10
a. Alkali metal
b. Halogen
c. Inert gas
d. Carbon group

11. ANSWER D. CARBON GROUP 11
•ALKALI METALS:
THE ELECTRONIC
CONFIGURATION
OF ALKALI
METALS IS NS1,
WHERE N IS THE
PRINCIPAL
QUANTUM
NUMBER.
EXAMPLE, THE
ELECTRONIC
CONFIGURATION
•HALOGENS:
THE ELECTRONIC
CONFIGURATION
OF HALOGENS
IS NS2 NP5,
WHERE N IS THE
PRINCIPAL
QUANTUM
NUMBER.
EXAMPLE, THE
ELECTRONIC
CONFIGURATION
INERT GASES:
THE ELECTRONIC
CONFIGURATION
OF INERT GASES
IS NS2 NP6,
WHERE N IS THE
PRINCIPAL
QUANTUM
NUMBER. FOR
EXAMPLE, THE
ELECTRONIC
CONFIGURATION
CARBON GROUP:
THE ELECTRON
CONFIGURATION 1S²
2S² 2P²
CORRESPONDS TO
THE
ELEMENT CARBON ,
WHICH HAS AN
ATOMIC NUMBER OF
6 . CARBON HAS TWO
ELECTRONS IN ITS 1S
ORBITAL, TWO
ELECTRONS IN ITS 2S
ORBITAL, AND TWO
√

12. LET GEN. ED
5 RANDOM SCIENCE
QUESTIONS (PART 1)
Thank you
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