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WorksheetsBSS club game
Total questions: 15
Worksheet time: 7mins
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
(a)
Which immune cells mature in the thymus?
B lymphocytes
T lymphocytes
Macrophages
Neutrophils
Enzyme responsible for adding nucleotides during DNA replication is
(a)
Which neurotransmitter is released by preganglionic neurons in both the sympathetic and parasympathetic nervous systems?
Norepinephrine
Dopamine
Acetylcholine
Serotonin
In the autonomic nervous system, which combination correctly describes the neurotransmitter and receptor type at the effector organ in the sympathetic division?
Acetylcholine → Muscarinic
Acetylcholine → Nicotinic
Norepinephrine → Adrenergic
Dopamine → Dopaminergic
During DNA replication, which sequence of enzymatic actions correctly describes primer synthesis and extension?
Helicase unwinds → DNA polymerase extends → Ligase joins fragments
Primase lays RNA primer → DNA polymerase III extends → DNA polymerase I replaces primer
DNA polymerase I synthesizes primer → Topoisomerase relieves strain → Ligase joins
Topoisomerase lays primer → Helicase unwinds → Polymerase extends
Which combination of changes most enhances the Bohr effect during vigorous exercise?
↑CO₂, ↑pH, ↑temperature
↑CO₂, ↓pH, ↑temperature
↓CO₂, ↑pH, ↓temperature
↑CO₂, ↓pH, ↓temperature
