Unit 1.3/2.1 Remediation

The feature that distinguishes euglena (a eukaryote) from cyanobacteria (a prokaryote) is the ______

• Ability to reproduce

• ability to maintain homeostasis

• Ribosomes are present

• A nuclear membrane is present

Which of these best explains why energy is needed for active transport?

• Ions are attached to large proteins

• Ions are moved against the concentration gradient

• Ions are negatively charged

• Ions are trapped inside the plasma membrane

Which of the following scenarios represents an example of osmosis?

• Blood vessels transport glucose to cells

• Carbon dioxide (CO₂)is eliminated during respiration

• Limp celery becomes crisp (crunchy, snaps easy) in water

• sweating lowers body temperature

What is the function of spikes/tail fibers/glycoproteins on a virus?

• move into a host cell

• attach to a host cell

• control a host cell's DNA

• signal other viruses to infect a host cell

Scientists determined that organisms of the genus Spinoloricus were eukaryotes and not prokaryotes because Spinoloricus cells have

• flagella

• hereditary (genetic) material

• cell walls

• nuclear membranes

If a paramecium (single celled organism) is placed in a hypertonic environment, which of the following will occur?

• salt will be pumped into the paramecium by the vacuole

• water will diffuse out of the paramecium

• salt will be pumped out of the paramecium by the vacuole

• water will diffuse into the paramecium

The rate at which molecules, water and oxygen can enter a cell is determined by the

• mass of the nucleus

• primary function of the cell

• size of the cell

• permeability of the cell membrane

Which of the following explains why active transport requires energy and passive does not?

• Active transport moves molecules in animal cells, passive transport moves molecules in plants

• Active transport moves molecules up (against) a concentration gradient, passive does not.

• Passive transport moves molecules up a concentration gradient, active does not.

• Passive transport can only move specific particles across a membrane, active can move any particle.

Which of the following statements correctly states one of the differences between viruses and bacteria?

• Viruses contain organelles while bacteria cells do not

• Viruses have a higher metabolism than bacteria cells

• Viruses reproduce asexually while bacteria cells reproduce sexually

• Viruses are much smaller than bacteria cells

Diffusion, osmosis, and active transport are all methods by which a cell _____________.

• maintains homeostasis

• creates energy

• removes waste

• reproduces