IB Bio Topic 1.1-1.3 Reading Guide

What is an example of binary fission? A. Cell division in prokaryotes B. Production of haploid gametes C. Separation of chromatids in prokaryotic cells D. Replication of prokaryotic DNA occurring simultaneously in two directions

A. Cell division in prokaryotes

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

A. Golgi apparatus

Which characteristics of stem cells makes them useful for treating Stargardt's disease? A. They can differentiate into retinal cells B. They are readily available from especially created embryos C. They transport white blood cells to the eyes D. They divide by binary fission so provide sufficient cells

A. They can differentiate into retinal cells

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. adhesion

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

A. fluidity of phospholipid bilayer

A red blood cell is 8 μm in diameter. If drawn 100 times larger than its actual size, what diameter will the drawing be in mm? A. 0.08 mm B. 0.8 mm C. 8 mm D. 80 mm

B. 0.8 mm

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

B. A fern

Which substance is used for structure in plants? A. Amylopectin B. Cellulose C. Collagen D. Starch

B. Cellulose

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 A. I only B. I and II only C. II and III only D. I, II and III

B. I and II only

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

B. Lysosome

Which feature of striated muscle cells allows them to be considered as a possible exception to the cell theory? A. They are found in multicellular organisms B. They contain more than one nucleus C. They are specialized for movement D. They do not carry out mitosis

B. They contain more than one nucleus

Where can 70S ribosomes be found? A. on membrane of the Golgi apparatus B. in prokaryotic cells C. on membranes of the rough endoplasmic reticulum D. in nuclei

B. in prokaryotic cells

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. it controls membrane fluidity

Which functions of life are carried out by all unicellular organisms? A. photosynthesis, nutrition, homeostasis B. nutrition, reproduction, response C. metabolism, photosynthesis, growth D. growth, reproduction, photosynthesis

B. nutrition, reproduction, response

What is a function of the plant cell wall? A. formation of vesicles for transport of large molecules B. prevention of excessive water uptake C. communication with other cells by means of glycoproteins D. active transport of ions

B. prevention of excessive water uptake

Which are 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 glycosis

C. Cell to cell communication and protein pumps

What are stem cells? A. Specialized cells that can be used therapeutically B. Surplus cells taken from an embryo C. Cells that retain their ability to divide and differentiate D. Cells in the xylem and phloem tissues that support a plant

C. Cells that retain their ability to divide and differentiate

Which functions of life are carried out by all unicellular organisms? A. Response, homeostasis, growth and photosynthesis B. Metabolism, ventilation, reproduction and nutrition C. Response, homeostasis, metabolism and growth D. Reproduction, ventilation, response and nutrition

C. Response, homeostasis, metabolism and growth

Where in the cell do condensation reactions involving amino acids occur? A. Nucleus B. Golgi apparatus C. Ribosomes D. Lysosomes

C. Ribosomes

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. The placement of integral and peripheral proteins in the membrane

What causes cells to differentiate? A. Sufficient nutrition B. Full expression of all genes C. Specialized functions at different stages of embryo development D. Expression of some genes with suppression of other genes.

D. Expression of some genes with suppression of other genes.

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 mitochondrion D. It lacks subdivision into separate cells

D. It lacks subdivision into separate cells

Which property makes stem cells suitable for therapeutic use? A. they can divide by meiosis to form gametes B. they contain chemicals that can kill bacteria C. Their chromosomes are suitable for gene transfer and cloning D. They can differentiate into specialized cells

D. They can differentiate into specialized cells

Where are proteins synthesized by free ribosomes used? A. Outside the cell after secretion B. Within the nucleus C. Within the lysosomes D. Within the cytoplasm

D. Within the cytoplasm

What happens to the cell surface area to volume ratio as a cell grows? A. it decreases, so production of waste material is reduced B. It increases, so mineral ion absorption is increased C. it increases, so osmosis is reduced D. it decreases, so rate of gas exchange is too low.

D. it decreases, so rate of gas exchange is too low.

Which structure is found in E. coli, but not in a eukaryotic cell? A. cell wall B. endoplasmic reticulum C. cytoplasm D. pili

D. pili

What structures are part if an Escherichia coli cell? A. ribosomes, nuclei and Golgi apparatus B. ribosomes, mitochondria and pili C. Cell wall, plasma membrane and nuclear membrane D. pili, flagella and cytoplasm

D. pili, flagella and cytoplasm

Why do multicellular organisms have emergent properties? A. they have more genes than unicellular organisms B. properties of unicellular organisms are enhanced by having many cells C. All of their genes are expressed whereas unicellular organisms express only some D. they show properties that can only result from the interaction of many cells

D. they show properties that can only result from the interaction of many cells