Which best describes how the vacuole helps plant cells to maintain homeostasis?

maintains water balance in the cell

Which describes how cell wall is able to provide shape, structure,& protection for plant cells?

It is made of a tough carbohydrate called cellulose.

Which best describes a selectively permeable plasma membrane?

Only certain substances can pass through the membrane.

What will most likely be the result if all of the mitochondria are removed from a plant cell?

It will be unable to carry out respiration.

How does a substance cross the plasma membrane against a concentration gradient?

It is recognized by protein & uses energy; crosses membrane

A cell is placed in a highly concentrated salt solution. What will happen if left in solution?

The cell will shrink in size, losing water due to osmosis.

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Bio Unit 2 Test Review

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Questions 13

Answers

1
What is the main function of the chloroplasts in plant cells?
to keep the cell rigid
to make the cell divide
to allow the plant to reproduce
to produce glucose
2
Which best describes how the vacuole helps plant cells to maintain homeostasis?
protects the genetic material
controls molecules entering and leaving the cell
performs photosynthesis to make ATP
maintains water balance in the cell
3
Which describes how cell wall is able to provide shape, structure,& protection for plant cells?
It is extremely large and provides needed storage.
It is made of a tough carbohydrate called cellulose.
It is a system of flat, stacked membrane sacs.
It is composed of a long, membranous tissue.
4
Which best describes a selectively permeable plasma membrane?
All substances use proteins to pass through the membrane.
All substances can pass through the membrane.
Only water can pass through the membrane.
Only certain substances can pass through the membrane.
5
If the demand for enzymes increased in a cell, which would increase in number to meet demand?
ribosomes
vacuole
mitochondria
nucleus
6
What will most likely be the result if all of the mitochondria are removed from a plant cell?
It will be unable to carry out respiration.
It will break down the ribosomes in the cell.
It will lose water through osmosis.
It will be unable to photosynthesize.
7
A red blood cell is placed in beaker containing distilled water. What will happen to the cell?
it will remain unchanged
it will shrink
it will swell
it will dissolve into the solution
8
Which function are carbohydrates least likely to perform in cell biology?
make up cell walls in plant cells
store energy in animal cells
store energy in plant cells
carry oxygen to tissues
9
How does a substance cross the plasma membrane against a concentration gradient?
It is recognized by protein & uses energy; crosses membrane
It uses osmosis to move from high to low across the membrane
It diffuses through the membrane using protein channels
It crosses the membrane as osmotic pressure builds up
10
If a molecule of water passed through the cell wall, which cell structure would it come to next
ribosomes
cytoplasm
cell membrane
nucleus
11
Which process moves an ion across a cell membrane against the concentration gradient?
exocytosis
active transport
diffusion
facilitated diffusion
12
A cell is placed in a highly concentrated salt solution. What will happen if left in solution?
The cell will grow in size, gaining water due to osmosis.
The cell will shrink in size, losing water due to osmosis.
The cell will grow in size, gaining some salt due to osmosis
The cell will shrink in size, losing its salt due to osmosis
13
Which molecules form the bilayer of the cell membrane?
carbohydrate
phospholipid
cholesterol
protein

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