Bio
A child with cystic brosis has an altered protein in his cells that stops chloride ions from leaving the cells. This protein most likely aects the functioning of
Cell memebranes
Identify the organelle present in plants where this conversion takes place.
Chloroplast
Witch process must take place first in order for the proteins in foods to be used by body cells
Digestion
Which structures regulate water loss and gas exchange in the leaves of plants?
Guard cells
An ameba, a one-celled organism, can move, ingest, and transport materials within the cell, because it has
Organelles
A characteristic common to both diusion and active transport is that
Oxygen is moved across a membrane
Explain why glucose molecules can cross a cell membrane and starch molecules can not.
Starch is a bigger molecule
If a starch indicator solution was initially added to the water in the beaker, describe one observation that would be made after one hour.
The starch solution would turn black and blue, The blacker water would turn Amber colored
Identify one likely substance in the environment of the cell that caused this response.
Water
The process used to remove excess water from the paramecium by the contractile vacuole is
active transport
Bacteria and humans are similar in that they both
contain genetic material
The student predicted that the contractile vacuole would contract fewer times in one minute in a solution that had a higher concentration of salt than that found in typical pond water. This prediction is most likely
correct, because water would be moving out of the cell into the salt solution
Which cell structure is mainly responsible for releasing energy from food molecules in some single-celled organisms?
mitochondrion
The processes of diffusion and active transport are both used to
move molecules into or out of cells of the body
Which sequence represents structures organized from least complex to most complex?
nucleus → nerve cell → brain → nervous system
Which sequence represents structures organized from most complex to least complex?
oak tree, leaf, guard cell, chloroplast
One primary function of the cell membrane is
regulating the flow of simple sugars into or out of the cell
A cell in the leaf of a corn plant contains more chloroplasts than a cell in the stem of a corn plant. Based on this observation, it can be inferred that, when compared to the cell in the stem, the cell in the leaf
synthesizes more sugar