Question

A patient goes to the doctor with a cold and sore throat and asks for antibiotics. The doctor refuses to prescribe antibiotics to the patient because the illness is caused by which of the following pathogens?

Answer 1

Correct Answers:

Virus

Rationale :

⇛ Colds and sore throats are most commonly caused by viruses, such as rhinoviruses or coronaviruses, not bacteria.

⇛ Antibiotics are only effective against bacterial infections, and prescribing them for viral illnesses is inappropriate and contributes to antibiotic resistance.

⇛ Viral infections typically resolve on their own with rest, hydration, and symptomatic care.

⇛ Educating patients on the difference between viral and bacterial infections is crucial for responsible antibiotic stewardship.

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Answer 2

Correct Answers:

Develops into any kind of cell

Rationale :

◈ A totipotent cell has the ability to differentiate into all cell types, including both embryonic and extra-embryonic (placental) tissues.

◈ The zygote and the first few divisions of cells after fertilization are totipotent.

◈ These cells are capable of forming a complete, viable organism, making them the most versatile stem cells.

◈ As development progresses, cells become pluripotent or multipotent, limiting the types of cells they can become.

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Answer 3

Correct Answers:

It gained an electron.

Rationale :

✓ A chloride ion (Cl⁻) forms when a neutral chlorine atom gains one electron, resulting in more electrons than protons.

✓ Since electrons carry a negative charge, gaining an extra electron causes the atom to become negatively charged.

✓ This makes it an anion, which is typical for nonmetals like chlorine in ionic bonding, especially with metals like sodium (Na⁺).

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Answer 4

Correct Answers:

Graduated cylinder, water, weighing balance

Rationale :

✍️ To calculate density, the student needs both mass and volume:

🔹 Weighing balance is used to measure mass.

🔹 Graduated cylinder and water are used to find volume by water displacement, especially for irregularly shaped objects.

✍️ When the solid is submerged in water, the change in water level equals the object's volume.

✍️ This allows for accurate use of the density formula:

Density = Mass / Volume

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Answer 5

Correct Answers:

Aa

Rationale :

⪢ The Punnett square shows a cross between an organism with an unknown genotype and one that is homozygous recessive (aa).

⪢ The offspring genotypes are:

1 AA
2 Aa
1 aa

⪢ This 1:2:1 ratio is only possible when the unknown parent is heterozygous (Aa) and the other parent is aa.

⪢ A cross of Aa × aa results in 50% heterozygous (Aa), and 50% homozygous recessive (aa), matching the distribution shown.

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Answer 6

Correct Answers:

Simultaneously in solid, liquid, and gas phases

Rationale :

◈ The triple point of a substance is the unique combination of temperature and pressure at which the substance can exist in equilibrium in all three phases: solid, liquid, and gas.

◈ At this precise point, all three states coexist without transitioning further, and the substance can convert between phases without any net change.

◈ Each pure substance has only one specific triple point, which is often used as a reference point in thermodynamics and phase diagrams (e.g., water's triple point is at 0.01°C and 611.657 Pa).

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Answer 7

Correct Answers:

Insulation

Rationale :

✳️ The myelin sheath is a fatty layer that surrounds the axon of many neurons, acting as an insulator.

✳️ It enables faster transmission of electrical impulses along the nerve fiber by allowing the impulse to jump between nodes of Ranvier in a process called saltatory conduction.

✳️ This insulation ensures that nerve signals are efficient, rapid, and accurate, which is critical for motor control and sensory processing.

✳️ Damage to the myelin sheath (e.g., in multiple sclerosis) leads to slowed or blocked nerve conduction, resulting in neurological symptoms.

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Answer 8

Correct Answers:

3' TCGATCGC A 5'

Rationale :

▶ DNA is a double-stranded molecule where base pairing follows complementary rules:

A pairs with T,
C pairs with G.

▶ The original strand is 5' AGCTAGCGT 3', so the complementary strand is read in the opposite (3' to 5') direction with the matching bases:

🔹 A → T, G → C, C → G, T → A, etc.

▶ The correct complementary sequence is: 3' TCGATCGCA 5'

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Answer 9

Correct Answers:

Apocrine gland

Rationale :

⪼ Apocrine glands are specialized sweat glands located in areas like the armpits, groin, and around the nipples.

⪼ Unlike eccrine sweat glands, apocrine glands secrete a thicker fluid rich in lipids and proteins, which interacts with skin bacteria to produce body odor.

⪼ These secretions also contain pheromones—chemical signals that can influence social and reproductive behaviors.

⪼ Apocrine glands become active at puberty and are considered part of the integumentary system due to their role in skin function and signaling.

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Answer 10

Correct Answers:

Proteins

Rationale :

✓ Enzymes are specialized proteins that function as biological catalysts, speeding up chemical reactions without being consumed.

✓ They are composed of long chains of amino acids folded into specific 3D structures, which determine their active sites and substrate specificity.

✓ Enzymes regulate virtually all metabolic processes in living organisms, including digestion, DNA replication, and energy production.

✓ While vitamins and other molecules may act as cofactors or coenzymes, the enzymes themselves are always proteins.

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QLexNursing

1 :
A patient goes to the doctor with a cold and sore throat and asks for antibiotics. The doctor refuses to prescribe antibiotics to the patient because the illness is caused by which of the following pathogens?

2 :
Which of the following is the function of a totipotent cell?

3 :
For which of the following reasons does a chloride ion have a negative charge?

4 :
To accurately measure the density of a series of small irregular solids made of plastic, wood, fiberglass, and glass, a student will need which of the following laboratory tools?

5 :
An organism with an unknown genotype is crossed with another organism that shows the recessive trait (aa). The Punnett square above shows the results. Which of the following is the unknown genotype?

6 :
The triple point of a substance is the temperature and pressure at which the substance exists as which of the following?

7 :
Which of the following functions does the myelin sheath perform for a nerve cell?.

8 :
If a portion of a strand of DNA bases reads 5' AGCTAGCGT 3', what would the sequence of bases on the complementary strand read?

9 :
Which of the following is a component of the integumentary system that secretes pheromones?

10 :
Which of the following classes of biological molecules includes enzymes?

QLexNursing

1 : A patient goes to the doctor with a cold and sore throat and asks for antibiotics. The doctor refuses to prescribe antibiotics to the patient because the illness is caused by which of the following pathogens?

2 : Which of the following is the function of a totipotent cell?

3 : For which of the following reasons does a chloride ion have a negative charge?

4 : To accurately measure the density of a series of small irregular solids made of plastic, wood, fiberglass, and glass, a student will need which of the following laboratory tools?

5 : An organism with an unknown genotype is crossed with another organism that shows the recessive trait (aa). The Punnett square above shows the results. Which of the following is the unknown genotype?

6 : The triple point of a substance is the temperature and pressure at which the substance exists as which of the following?

7 : Which of the following functions does the myelin sheath perform for a nerve cell?.

8 : If a portion of a strand of DNA bases reads 5' AGCTAGCGT 3', what would the sequence of bases on the complementary strand read?

9 : Which of the following is a component of the integumentary system that secretes pheromones?

10 : Which of the following classes of biological molecules includes enzymes?

1 :
A patient goes to the doctor with a cold and sore throat and asks for antibiotics. The doctor refuses to prescribe antibiotics to the patient because the illness is caused by which of the following pathogens?

2 :
Which of the following is the function of a totipotent cell?

3 :
For which of the following reasons does a chloride ion have a negative charge?

4 :
To accurately measure the density of a series of small irregular solids made of plastic, wood, fiberglass, and glass, a student will need which of the following laboratory tools?

5 :
An organism with an unknown genotype is crossed with another organism that shows the recessive trait (aa). The Punnett square above shows the results. Which of the following is the unknown genotype?

6 :
The triple point of a substance is the temperature and pressure at which the substance exists as which of the following?

7 :
Which of the following functions does the myelin sheath perform for a nerve cell?.

8 :
If a portion of a strand of DNA bases reads 5' AGCTAGCGT 3', what would the sequence of bases on the complementary strand read?

9 :
Which of the following is a component of the integumentary system that secretes pheromones?

10 :
Which of the following classes of biological molecules includes enzymes?