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