teas ai science review

Which organelle is responsible for controlling the activities of the cell and storing genetic information?

A. Ribosome

B. Nucleus

C. Mitochondria

D. Lysosome

Nucleus

A patient has damage to the myelin sheath surrounding neurons. Which function would most likely be affected?

A. Production of neurotransmitters

B. Speed of nerve impulse transmission

C. Formation of red blood cells

D. Muscle contraction strength only

Speed of nerve impulse transmission

Which type of tissue lines body cavities and protects underlying tissues?

A. Muscle tissue
B. Nervous tissue
C. Epithelial tissue
D. Connective tissue

Epithelial tissue

Which structure prevents food from entering the trachea during swallowing?

A. Larynx
B. Epiglottis
C. Pharynx
D. Esophagus

Epiglottis

The primary function of red blood cells is to:

A. Fight infection
B. Produce antibodies
C. Transport oxygen
D. Form blood clots

Transport oxygen

Which hormone is released by the pancreas to decrease blood glucose levels?

A. Glucagon
B. Insulin
C. Cortisol
D. Thyroxine

Insulin

The functional unit of the kidney responsible for filtering blood is the:

A. Neuron
B. Alveolus
C. Nephron
D. Villus

Nephron

Which chamber of the heart receives oxygenated blood from the lungs?

A. Right atrium
B. Right ventricle
C. Left atrium
D. Left ventricle

Left atrium

During inhalation, the diaphragm:

A. Relaxes and moves upward
B. Contracts and moves downward
C. Stops movement completely
D. Forces air out of the lungs

Contracts and moves downward

Which part of the brain controls balance and coordination?

A. Cerebrum

B. Cerebellum

C. Medulla oblongata

D. Hypothalamus

Cerebellum

Which immune cell type is primarily responsible for destroying infected body cells?

A. Red blood cells

B. Platelets

C. T lymphocytes

D. Osteocytes

T lymphocytes

Which digestive enzyme begins breaking down carbohydrates in the mouth?

A. Pepsin

B. Lipase

C. Amylase

D. Trypsin

Amylase

The main function of the skeletal system is to:

A. Produce hormones only

B. Support the body and protect organs

C. Transport oxygen

D. Digest nutrients

Support the body and protect organs

Which blood vessel carries oxygenated blood from the lungs to the heart?

A. Pulmonary artery

B. Pulmonary vein

C. Aorta

D. Vena cava

Pulmonary vein

Which hormone regulates metabolism by controlling cellular activity?

A. Insulin

B. Estrogen

C. Thyroid hormone

D. Melatonin

Thyroid hormone

The exchange of oxygen and carbon dioxide occurs mainly through:

A. Active transport

B. Diffusion

C. Osmosis

D. Filtration

Diffusion

Which muscle type is found in the walls of internal organs?

A. Skeletal muscle

B. Cardiac muscle

C. Smooth muscle

D. Voluntary muscle

Smooth muscle

The primary function of the large intestine is:

A. Protein digestion

B. Absorption of water

C. Production of bile

D. Oxygen exchange

Absorption of water

DNA is composed of repeating units called:

A. Amino acids

B. Nucleotides

C. Fatty acids

D. Monosaccharides

Nucleotides

Which process produces two genetically identical daughter cells?

A. Meiosis

B. Fertilization

C. Mitosis

D. Mutation

Mitosis

Which molecule carries genetic instructions from DNA to ribosomes?

A. ATP

B. RNA

C. Lipid

D. Glucose

RNA

Photosynthesis occurs in which organelle?

A. Chloroplast

B. Nucleus

C. Ribosome

D. Mitochondria

Chloroplast

A mutation is best described as:

A. A normal protein

B. A change in DNA sequence

C. Cell division

D. Energy production

A change in DNA sequence

Which macromolecule is the body's main source of quick energy?

A. Proteins

B. Lipids

C. Carbohydrates

D. Nucleic acids

Carbohydrates

An organism that obtains energy by consuming other organisms is:

A. Autotroph

B. Producer

C. Heterotroph

D. Decomposer only

Heterotroph

Meiosis produces cells that contain:

A. Double the chromosomes

B. Half the chromosomes

C. No DNA

D. Identical chromosomes only

Half the chromosomes

Proteins are made from smaller units called:

A. Nucleotides

B. Amino acids

C. Glucose molecules

D. Fatty acids

Amino acids

A substance with a pH of 2 is:

A. Basic

B. Neutral

C. Acidic

D. Radioactive

Acidic

The smallest unit of an element that retains its properties is:

A. Molecule

B. Atom

C. Cell

D. Compound

Atom

Which particle has a negative charge?

A. Proton

B. Neutron

C. Electron

D. Nucleus

Electron

Water is considered a polar molecule because:

A. It contains no electrons

B. It has uneven charge distribution

C. It cannot dissolve substances

D. It is always acidic

It has uneven charge distribution

A bond formed by sharing electrons is called:

A. Ionic bond

B. Covalent bond

C. Hydrogen bond

D. Metallic bond

Covalent bond

Which substance is a strong base?

A. pH 1

B. pH 5

C. pH 7

D. pH 13

pH 13

The chemical formula for carbon dioxide is:

A. CO

B. CO₂

C. C₂O

D. CaO

CO₂

The chemical formula for carbon dioxide is:

A. CO

B. CO₂

C. C₂O

D. CaO

C₂O

The chemical formula for carbon dioxide is:

A. CO

B. CO₂

C. C₂O

D. CaO

CO₂

A hypothesis should be:

A. A random opinion

B. Testable and measurable

C. Already proven true

D. Based only on beliefs

Testable and measurable

The purpose of a control group is to:

A. Increase errors

B. Provide a comparison

C. Change multiple variables

D. Remove data

Provide a comparison

A scientist repeats an experiment multiple times to:

A. Change the hypothesis

B. Increase reliability

C. Avoid collecting data

D. Remove variables

Increase reliability

Which graph is best for showing changes over time?

A. Line graph

B. Pie chart

C. Scatter plot only

D. Histogram only

Line graph

If two variables increase together, they show:

A. Negative correlation

B. Positive correlation

C. No relationship

D. Experimental failure

Positive correlation

The independent variable is:

A. What is measured

B. What is changed by the researcher

C. The final conclusion

D. The collected data

What is changed by the researcher

A scientific conclusion should be based on:

A. Personal beliefs

B. Experimental evidence

C. Predictions only

D. Opinions

Experimental evidence

Which measurement is most precise?

A. 5 cm

B. 5.2 cm

C. 5.200 cm

D. 5 cm approximately

5.200 cm

A patient has low calcium levels. Which system is most directly affected?

A. Skeletal system

B. Respiratory system

C. Digestive system

D. Nervous system only

Skeletal system

Which process moves water across a selectively permeable membrane?

A. Diffusion

B. Osmosis

C. Active transport

D. Endocytosis

Osmosis

Which molecule provides immediate energy for cellular processes?

A. DNA

B. ATP

C. Protein

D. Cholesterol

ATP

A researcher observes that plants grow taller with increased sunlight. What should be tested next?

A. Whether sunlight affects growth rate

B. Whether plants need water

C. Whether soil exists

D. Whether plants contain DNA

Whether sunlight affects growth rate

Which system works with the endocrine system to regulate body functions?

A. Nervous system

B. Skeletal system

C. Digestive system

D. Integumentary system

Nervous system

Homeostasis refers to:

A. Cell destruction

B. Maintaining a stable internal environment

C. Increasing body temperature constantly

D. Preventing all disease

Maintaining a stable internal environment