Comprehensive Biology and Chemistry: Reactions, Genetics, and Human Body

Which statement best describes a chemical reaction?

A. A change in the size of a substance

B. A process that forms new substances with different properties

C. A change in the physical state only

D. A process that destroys matter

B. A process that forms new substances with different properties

In the equation 2H2+O2→2H2O2H2+O2→2H2O, what are H2H2 and O2O2?

A. Products

B. Catalysts

C. Reactants

D. Compounds

C. Reactants

Which is a sign that a chemical reaction has occurred?

A. Change in shape only

B. Change in color

C. Increase in mass only

D. Melting of ice

B. Change in color

What type of reaction occurs when two or more substances combine to form one product?

A. Decomposition reaction

B. Double displacement reaction

C. Combination reaction

D. Neutralization reaction

C. Combination reaction

Which type of reaction breaks one compound into two or more simpler substances?

A. Combination reaction

B. Decomposition reaction

C. Synthesis reaction

D. Displacement reaction

B. Decomposition reaction

Who is credited with developing the modern periodic table?

A. Isaac Newton

B. Albert Einstein

C. Dmitri Mendeleev

D. John Dalton

C. Dmitri Mendeleev

What is a gene?

A. A type of chromosome

B. A unit of inheritance

C. A protein molecule

D. A cell organelle

B. A unit of inheritance

An individual with genotype Aa is:

A. Homozygous dominant

B. Homozygous recessive

D. Codominant

C. Heterozygous

C. Heterozygous

What is the main function of the skeletal system?

A. Produces hormones

B. Digests food

C. Provides support and protection for the body

D. Filters blood

C. Provides support and protection for the body

Which cells play a major role in the immune system?

A. Red blood cells

B. White blood cells

C. Platelets

D. Muscle cells

B. White blood cells

The endocrine system primarily controls body functions through:

A. Electrical impulses only

B. Hormones

C. Blood cells

D. Enzymes

B. Hormones

Which layer of the skin is the outermost protective layer?

A. Dermis

B. Hypodermis

C. Epidermis

D. Adipose tissue

C. Epidermis

Complete digestion of food occurs mainly in the:

A. Stomach

B. Esophagus

C. Small intestine

D. Large intestine

C. Small intestine

Which organ produces bile?

A. Pancreas

B. Liver

C. Gallbladder

D. Kidney

B. Liver

What is the function of bile in digestion?

A. Digests proteins directly

B. Breaks down starch into glucose

C. Emulsifies fats into smaller droplets

D. Produces insulin

C. Emulsifies fats into smaller droplets

Which enzyme digests proteins in the small intestine?

A. Lipase

B. Amylase

C. Trypsin

D. Maltase

C. Trypsin

Lipase helps digest:

A. Proteins

B. Fats

C. Vitamins

D. Minerals

B. Fats

Villi in the small intestine function to:

A. Produce hormones

B. Store bile

C. Increase surface area for absorption

D. Neutralize stomach acid

C. Increase surface area for absorption

The end products of protein digestion are:

A. Fatty acids

B. Glucose

C. Amino acids

D. Glycerol

C. Amino acids

Photosynthesis is an example of what type of reaction?

A. Exothermic reaction

B. Endothermic reaction

C. Neutralization reaction

D. Combustion reaction

B. Endothermic reaction

Which statement correctly describes a homozygous individual?

A. Has two different alleles

B. Has one allele only

C. Has two identical alleles

D. Has no alleles

C. Has two identical alleles

Which component of the immune system helps fight infections?

A. Neurons

B. White blood cells

C. Osteocytes

D. Red blood cells

B. White blood cells

The pancreas secretes digestive enzymes into the:

A. Stomach

B. Liver

C. Small intestine

D. Large intestine

C. Small intestine

Glucose is produced from the digestion of:

A. Proteins

B. Fats

C. Complex carbohydrates

D. Vitamins

C. Complex carbohydrates

Which digestive organ absorbs most nutrients?

A. Stomach

B. Small intestine

C. Large intestine

D. Esophagus

B. Small intestine