The picture shows a contractile vacuole of a unicellular freshwater organism. The contractile vacuole regulates the flow of water into and out of the cell in an aquatic environement. What condtions cause the contracile vacuole to fill with water? Your answer: The concentration of water is greater outside the cell than inside the cell. The concentration of water inside the cell is the same as the concentration outside the cell. The temperature of water in the vacuole is higher than the temperature of its environment.

Answer:

The concentration of water is greater outside the cell than inside the cell.

Explanation:

In living cells, water moves by Osmosis across the cell membrane, which acts as the semi-permeable membrane. Osmosis is the movement of water molecules from a region of high water concentration (low solute concentration) to a region of low water concentration (high solute concentration).

The contractile vacuole of this freshwater organism helps regulate water intake and exit by storing excess water. According to osmotic flow, water will flow into the organism via its cell membrane (semi-permeable membrane) because the concentration of water outside the cell is high than inside the cell, hence, this causes an osmotic gradient causing water to flow into the cell. The water that flows into the cell is stored in the Contractile vacuole.

What method is used when you try several different solutions to see what
works?

3. (4pts) A constraint is a limitation or condition that must be satisfied by a design. For example, you may onl
be able to use certain materials, or you might want the device to operate at a certain speed.
What was a constraint (a limitation or a condition) in this version?

What happens when muscles in the frogs body wall contract?

What else are extreme sports sometimes called?
O A. Action sports
O B. Adventure sports
O C. Adrenaline sports
D. Both A and B

When are two populations likely to have very similar allele frequencies?

A. If the selective pressures are different
B. If there is a high mutation rate
C. If there is a large amount of genetic drift
D. If there is a large amount of gene flow

Which community has the greater species diversity?
Select one:

Community Y, because the total number of individuals is greater

Community Y, because the community is richer

Community X, because the distribution of species is more even

Community X, because the community is richer

What are the basic units of protein macromolecules?

1. Did your buoy move as you expected? Explain why or why not.

Compared to other nations, Americans spend the highest percentage of their disposable income on food.
True or False?

5
The outermost layer of the sun is called the
corona
chromosphere
ionosphere
photosphere

Which type of tissue carries messages?
A. Nervous tissue
B. Connective tissue
C. Muscle tissue
D. Epithelial tissue
SUBN

Why a specialized cell does not undergo mitosis?

Design a plan that can be used by oil workers everywhere to save ecosystems

Which statement best describes Mendelian or complete dominance?



When both the dominant and recessive allele shows.



When the dominant and recessive alleles mix to form a third phenotype.



When the dominant trait or allele completely masks the recessive allele.

The law of April 6 1830 signaled a major shift in

fruit is absent in ?

a.Mango
b.rose
c. pine
d.sunflower ​

What molecule makes the trunk of a tree sturdy?
O A. Fructose
O B. Disaccharide
C. Cellulose
O D. Glucose

Raising more sustainable fish would require choosing fish species such as____?
A. Tilapia that eat algae and plants
B. Tuna that eat other fish
C. Catfish that eat fishmeal
D. Carp that eat fertilizer
E. Trout that can be easily caught

A wet mount slide from a sample of Elodea leaf cells and a slide from a sample of red blood cells were initially examined using a light microscope. The remaining
portions of the two cells samples were then placed into a 20% sucrose solution. After 30 minutes, the cells were again examined using a light microscope. Which
statements best describes their appearance?
Your answer:
A. The leaf cells had undergone plasmolysis while the red blood cells had shriveled.
B. The leaf cells were swolle and turgid while the red blood cells remain unchanged.
C. Both the leaf cells and the rat blood cells had swollen and burst.

A scientist decides to study the effect of salt on a particular type of bacteria. Arrange the steps of the scientific method in the correct order to
show how the scientist would proceed with his work.
The scientist asks the question,
Does salt help the growth of
these bacteria?
>
The scientist puts the bacteria in
three different environments:
high salt, medium salt, and low salt.
A microbiologist notices that
some bacterial species thrive
in salt water environments.
The scientist forms a hypothesis
that higher concentrations of salt
may increase the growth of these
types of bacteria.
The scientist publishes his report
in a scientific journal.

Several natural processes contribute to speciation, the development of new
species. Which of these conditions is most likely to result in speciation?
A. Genetic drift that occurs in two reproductively isolated populations
B. Genetic recombination in a small population
C. Genetic mutations that occur often in a large population
O D. Gene flow between two geographically isolated populations
SUBNIT

Which features did you include in your answer? Check all that apply.

It’s specific and testable.

It can be used to form a hypothesis.

It is not based on an opinion or values.

It does not relate to the supernatural.

How is a genetic switch different than a gene? How are they the same

Which of the following do cells obtain from nutrients in food?
A. lithium
B. helium
C. energy
D. oxygen

Environmental damage due to increased pesticide use

What is the original source of energy for gasoline?
O plants
O Sun
O petroleum
O fossil fuels​

Most scientists agree that saturated fats contribute to high levels of “bad” cholesterol, while monounsaturated fats and polyunsaturated fats lower this type of cholesterol. The table below shows data about fats in some common foods.

Food (14 g) Saturated fat (g) Monounsaturated fat (g) Polyunsaturated fat (g)
Canola oil 1.0 8.9 3.9
Margarine 1.6 5.4 3.4
Olive oil 1.9 9.9 1.4
Lard 5.0 5.8 1.4
Butter 7.9 3.7 0.5

Joyce and Linda are identical twins who are 50 years old and enjoy exercising daily. Joyce avoids eating any dairy or animal products and eats granola made with canola oil for breakfast. Linda prefers rich foods, and eats bacon, eggs, and buttered toast each morning. Which statement describes a logical inference that can be made from the provided information?

a)Butter has higher levels of saturated fats in it than canola oil.
b)Linda and Joyce both have high levels of “bad” cholesterol.
c)Butter contains a small amount of polyunsaturated fats.
d)Linda has a higher level of “bad” cholesterol than Joyce.

Anna applies a force of 84n Nto lift her baby nephew 2.0 m. How much work
does Anna do? Answer

How is DNA used as evidence for evolution?

Growing food in urban areas could improve food security worldwide.
True or false?