Which organelle is responsible for packaging and modifying proteins for secretion?

• nucleus

• golgi apparatus

• mitochondria

• ribosomes

What is the main structural difference between DNA and RNA?

• DNA has uracil; RNA has thymine

• DNA has ribose; RNA has deoxyribose

• DNA has deoxyribose and thymine; RNA has ribose and uracil

• They are structurally identical

Which type of bond connects the two strands of DNA?

• Ionic bonds

• Peptide bonds

• Hydrogen bonds

• Disulfide bonds

What is the primary function of hemoglobin in the blood?

• Transport of oxygen

• Production of antibodies

• Blood clotting

• pH regulation only

Which blood vessels carry oxygenated blood away from the heart?

• Veins

• Arteries

• Capillaries

• Venules

What is the main difference between prokaryotic and eukaryotic cells?

• Only prokaryotes have ribosomes

• Eukaryotes lack a cell membrane

• Eukaryotes have a nucleus and membrane-bound organelles

• Prokaryotes have mitochondria

Which protein in muscle fibers is responsible for contraction by interacting with actin?

• Collagen

• Elastin

• Myosin

• Tubulin

What is the role of the alveoli in the respiratory system?

• Pumping air in and out of the lungs

• Gas exchange

• Filtering dust and pathogens

• Producing mucus

The process by which mRNA is synthesized from DNA

Which immune cells mature in the thymus?

• B lymphocytes

• T lymphocytes

• Macrophages

• 6. Neutrophils