HL1 Biology Final - Topic 1 Review

Animal cells often secrete glycoproteins as extracellular components. What is a role of these glycoproteins? A. Adhesion B. Additional energy reserve C. Membrane fluidity D. Water uptake

A

The giant alga Acetabularia has a feature that suggests it is an exception to the cell theory. What feature is this? A. It lacks a nucleus. B. It lacks a cell wall. C. It has only one mitcochondrion D. It lacks subdivision into separate cells

A

What feature of cell membranes allows endocytosis to occur? A. Fluidity of phospholipid B. Presence of protein pumps C. Presence of carrier proteins D. Glycoprotein binding sites

A

What is osmosis? A. The movement of water through the membrane from a low to a high solute concentration B. The movement of water through a membrane from high to a low solute concentrations C. The movement of solutes through a membrane from a high to a low water concentration

A

Which of theses processes require mitosis? A. Embryological development B. Reducing surface area to volume ratio C. Maintaining cell size D. Cell growth

A

Which organelle is involved in generating vesicles destined for the cell membrane? A. Golgi apparatus B. Smooth endopasmic reticulum C. Rough endoplasmic reticulum D. Lysosome

A

What is a role of cholesterol in animal cells? A. It increases body fat. B. It controls membrane fluidity C. It lines the inner wall of capillaries D. It is a constituent of bile.

B

What route is used to export proteins from the cell? A. Golgi apparatus - rough endoplasmic reticulum - plasma membrane B. Rough endoplasmic reticulum - Golgi apparatus - plasma membrane C. Golgi apparatus - lysosome - rough endoplasmic reticulum

B

Which organism has DNA located in three organelles? A. A sponge B. A fern C. A flatworm D. A bacterium

B

Which process requires channel proteins? A. Simple diffusion B. Facilitated diffusion C. Binding of hormones D. Exocytosis

B

Which structure found in eukaryotes has a single membrane? A Nucleus B. Lysosome C. Chloroplast D. Mitichondrion

B

The cell membrane model proposed by Davson-Danielli was a phospholipid bilayer sandwiched between two layers of globular protein. Which evidence led to the acceptance of the Singer-Nicolson model? A. The orientation of the hydrophilic phospholipid heads towards the proteins. B. The formation of a hydrophobic region on the surface of the membrane. C. The placement of integral and peripheral proteins in the membrane. D. The interactions due to amphipathic properties of phospholipids.

C

What are the functions of membrane proteins? A. Hormone binding sites and DNA replication B. Cell adhesion and translation C. Cell to cell communication and protein pumps D. Passive transport and glycolysis

C

What occurs during meiosis but not mitosis? A. Spindles are formed from microtubles B. Chromosome number is conserved C. Homologous chromosomes pair up D. Centromeres split

C

Which of the following does not occur during interphase? A. Replication B. Translation C. Cytokinesis D. An increase in the number of mitochondria

C

Which process contributes to the growth of a multicellular body? A. Exocytosis B. Meiosis C. Mitosis D. Osmosis

C

What is the difference between simple diffusion and facilitated diffusion? A. Rate decreases with increasing concentration gradient - Rate increases with increasing concentration gradient B. Always involves a membrane - Never involves a membrane C. Uses any part of a membrane - uses channels in the membranes.

C.

Cells in the adrenal gland produce the hormone epinephrine and store it in vesicles. To release epinephrine these vesicles are carried to the plasma membrane and fuse with it. What process is occurring? A. Expulsion B. Exchange C. Excretion D. Exocytosis

D

The salt concentration inside an animal cell is 1.8%. The salt concentration in the surrounding medium becomes 5%. What will be the likely response? A. The cell will gain water from the medium B. The cell will lose salt to the medium C. The cell will remain unchanged. D. The cell will shrink from loss of water

D

What describes nuclear division in stem cells? A. clonal selection B. Mitosis C. Cytokinesis D. Meiosis

D

What is the evidence for the endosymbiotic theory? A. RNA can catalyze metabolic reactions B. Meteorites contain organic molecules C. Amino acids can be synthesized from inorganic compounds D. Mitochondria possess their own DNA

D

Which events occur during G1 phase and S phase of the cell cycle? A. DNA replicates - cell grows B. Mitosis begins - cell divides C. Cell divides - mitosis begins D. Cell grows - DNA replicates

D

Which evidence falsifies the Davson-Danielli model? I. The presence of globular proteins within the phospholipid bilayer II. Non-polar amino acids cause proteins to remain embedded in membranes III. Membrane proteins remain in a fixed position inside a membrane

I and II

Which of the following processes take place during interphase in animal cells? I. Spindle formation II. Transcription and translation III. Increase in numbers of mitochondria

II and III