Science Teas Questions

hat do all atoms of a given element have in common?

The same number of protons

Which pH value represents an acidic solution?

5

When bacteria enter the body through a skin cut, which system primarily prevents infection?

The immune system

C₃H₈ + __ O₂ → 3CO₂ + 4H₂O. What coefficient balances O₂?

5

If a DNA strand reads 5′ AGCTAGCGT 3′, what is the complementary strand sequence?

3′ TCGATCGCA 5′

What process moves most carbon dioxide from the blood into the alveoli?

Diffusion down a concentration gradient

Which metric unit is best for measuring the diameter of a red blood cell?

Micrometer (μm)

Which substance is excreted by sweat glands during protein breakdown and ammonia formation?

Urea

Which process causes carbon dioxide to change directly from solid to gas?

Sublimation

Which instrument is used to measure mass?

Balance

What are the two major parts of the nervous system?

Peripheral nervous system (PNS) and central nervous system (CNS)

Which substance donates H+ ions to act as a buffer when blood pH rises?

Carbonic acid

Which substance protects the skin from ultraviolet radiation?

Melanin

What is the function of the larynx?

Houses the vocal cords needed for speech

The pleura is a connective tissue sheath that covers which organ?

Lungs

In a phase diagram, what term describes when solid, liquid, and gas exist simultaneously?

Triple point

Red flowers are dominant over white. A heterozygous red plant crosses with a white plant. What is the expected phenotypic ratio?

1:1 (2 red : 2 white)

On which days of the menstrual cycle is a woman most fertile?

Around days 12–14 (ovulation phase)

Which physiological response is caused by antidiuretic hormone (ADH) release?

Increased water reabsorption in the collecting ducts

Why is it important for new scientific findings to be published?

Other scientists can validate or disprove the findings

Which structure is part of the pulmonary circuit?

Pulmonary vein

Which pancreatic secretion breaks starch down into disaccharides?

Amylase

Which unit is used to indicate mass?

mg (milligrams)

Which substance is excreted by sweat glands during protein breakdown and ammonia formation?

Urea

Which structure is a flap of cartilage that prevents food from entering the trachea?

Epiglottis

Which of the following is a property of water?

It dissolves polar and ionic compounds

What process moves most carbon dioxide from the blood into the alveoli?

Diffusion down a concentration gradient

Which body cavity is divided into the thoracic and abdominopelvic cavities?

Ventral cavity

What is the function of tendons?

Connect skeletal muscles to bones

Which base is found in RNA but not in DNA?

Uracil

What is the function of a totipotent cell?

It can develop into any kind of cell

Which statement about the pH scale is correct?

A substance with a pH of 3 is 10 times more acidic than one with a pH of 4

What function does the myelin sheath perform for a nerve cell?

Insulation and faster signal transmission

What happens to particles when a solid turns into a liquid?

Particles become less ordered and move more freely

What tools are needed to measure the density of small irregular solids?

A graduated cylinder, water, and a weighing balance

Which class of biological molecules includes enzymes?

Proteins

What is the effect of using a catalyst in a chemical reaction?

The reaction occurs in less time by lowering activation energy

Why might a doctor refuse to prescribe antibiotics for a cold or sore throat?

The illness is caused by a virus

In which body region are the tibia and fibula located?

The crural region (lower leg)

What action allows for repolarization of a neuron?

Potassium channels open, allowing K+ to leave the neuron

Which structure contains a human's hereditary information?

Chromatin

If A = atomic mass and Z = atomic number, what happens to an atom after emitting a proton?

A decreases by 1 and Z decreases by 1

Which cell type stimulates other immune cells to attack and destroy foreign agents?

Helper T cells

Experiments cannot validate hypotheses, only falsify them. How can this be restated?

An unfalsified hypothesis is considered provisional

Which tissue lines the interior surfaces of the heart?

Endocardium

Which of the following is classified as a noninfectious disease?

Psoriasis

Which organelle is the site of intracellular digestion?

Lysosomes

Which tool measures liquid turbidity by detecting light transmission through a sample?

Spectrophotometer

Which respiratory structure is damaged by diseases such as emphysema that disrupt gas exchange?

Alveoli