Advanced level 2026 south west regional mock biology 1

Which cell organelle is the suicidal bag of the cell?

A Golgi apparatus.

B Lysosome.

C Ribosome.

D Endoplasmic reticulum.

Which of the following is the main structural difference between triglycerides and phospholipids?

A Triglycerides contain three fatty acids molecules while in phospholipids one of the fatty acids is replaced by a phosphate group.

B Triglycerides contain hydrogen, carbon and oxygen while in phospholipids the hydrogen atoms are replaced by phosphates.

C Triglycerides contain three glycerol molecules while in phospholipids, one of these glycerol molecules is replaced by a phosphate group.

D Triglycerides contain fatty acid molecules but in phospholipids these fatty acids are replaced by phosphate groups.

The correct order of stages in the control of digestive secretions is;

A Gastric, cephalic and intestinal.

B Intestinal, gastric and cephalic.

C Cephalic, gastric and intestinal.

D Gastric, intestinal and cephalic.

The eyes of octopuses and cats show different patterns of structure but perform similar functions. This is an example of

A Homologous organs that have evolved due to convergent evolution.

B Homologous organs that have evolved due to divergent evolution.

C Analogous organs that have evolved due to convergent evolution.

D Analogous organs that have evolved due to divergent evolution.

Enterokinase helps in the conversion of

A Proteins into polypeptides.

B Pepsinogen into pepsin.

C Lactose into sucrose.

D Trypsinogen into trypsin.

In the lytic cycle of a virus

A The viral genome remains integrated into the host cell and dormant for a period of time.

B There is the rapid production of virus and eventual bursting and destruction of the host cell.

C The viral DNA integrates into the host chromosome and is replicated with it.

D The prophage is inserted into the bacterial chromosome.

The sliding filament model of muscle contraction explains how;

A ATP is hydrolyzed into ADP and Pi

B The sarcomere lengthens during contraction

C Myosin and actin filaments shorten during contraction.

D Actin filaments slide past myosin filaments causing the sarcomere to shorten.

In the transmission of nerve impulses across the synapse, neurotransmitters are released into the synaptic cleft when:

A They bind to receptors on the post-synaptic membrane.

B The synaptic vesicle fuses with the pre-synaptic membrane.

C The neurotransmitters diffuse across the synaptic cleft.

D The synaptic vesicle fuses with the post-synaptic membrane.

The purine bases found in DNA are

A Cytosine and adenine.

B Adenine and thymine.

C Cytosine and guanine.

D Adenine and guanine

When do ovulation in the human female normally takes place during the menstrual cycle?

A At the end of the proliferative phase.

B At the beginning of the proliferative phase.

C Just before the end of the secretory phase.

D At the end of the secretory phase.