1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Ratling [72]
3 years ago
13

Your lab group is experimenting with the diffusion of molecules across a membrane. Dialysis tubing is used as a model cell membr

ane because is it semi-permeable, allowing small molecules to cross the membrane, but NOT larger molecules, like starch. A starch solution is placed in the dialysis tubing and then the dialysis tubing is placed in an iodine and water solution. Iodine is used as an indicator for the presence of starch. Normally, iodine is a yellow-brown color (on the left), but in the presence of starch, it turns a deep purple (right). After observing the experimental setup for 20 minutes, the iodine solution remains brown, but the starch solution inside the dialysis tubing is purple and swollen. What CANNOT be concluded from the results? A) Iodine is a small molecule and diffused through the dialysis tubing INTO the starch solution. B) Starch is a large molecule and could NOT diffuse through the dialysis tubing into the iodine solution. C) Starch requires ATP energy for transport and therefore cannot cross the dialysis tubing into the iodine solution. Eliminate D) The starch solution is hypertonic to the iodine solution, causing water to move across the dialysis tubing INTO the starch solution.
Biology
2 answers:
BlackZzzverrR [31]3 years ago
7 0

Answer:

answer is d on usatestprep

Explanation:

Serga [27]3 years ago
7 0

Answer:

D- Starch crosses the cell membrane at E.

Explanation:

E is a membrane protein that can be used for facilitated diffusion, in which large or charged molecules can move across the cell membrane. Facilitated diffusion is passive transport, meaning molecules diffuse from high to low concentration, without the need for ATP energy, using a transport protein. Only small, nonpolar molecules can diffuse through the phospholipid bilayer directly.

You might be interested in
What are the steps to construct a modern beehive​
Nikolay [14]

Answer:

go and type this you will get it

Explanation:

How to construct a modern beehive​

Hope it helps you

In traditional hives, the bees make their own wax combs that are often attached to each other, so harvesting the honey is difficult. Honey can be extracted only two or three times a year from a traditional beehive. A modern beehive produces double to triple the volume of honey compared to a traditional hive.

4 0
3 years ago
Cells Writing Prompt #1
Andreyy89

Answer:

popcorn kernels aren't living things

Explanation:

characteristics they have that show proof they are living organisms:

• movement when exposed to heat

• irritability/sensitivity since they react to change of temperature

• growth since when they are exposed to high temperatures they grow and become bigger

We can determine if they are living or not by:

• seeing if they respire

• seeing if they need nourishment

• seeing if they can excrete

• seeing if they can reproduce

In conclusion they aren't living things

8 0
2 years ago
Patsy has always been “larger than life.” She tends to blow even small annoyances out of proportion. For example, when the store
hjlf
Neuroticism is the anwer
3 0
3 years ago
Read 2 more answers
A griffin is a mythical creature that appears in many stories. It has the head of an eagle and the body of a lion. What role cou
Ivanshal [37]

Answer:  

D. The griffin has no role in biology, because it is not real.

Explanation:

Science focuses solely on the natural world.

6 0
3 years ago
Read 2 more answers
HELP!!!! Restriction maps illustrate the lengths of DNA fragments between restriction sites. Which of the following information
balandron [24]
The wording of this is confusing. I think it’s A and B and I’m hesitant say that it’s also C but only if you know the mutation and the gene.

Also for A you would only know a partial sequence of the gene.
6 0
3 years ago
Other questions:
  • Which statements describe a good hypothesis? Check all that apply. A good hypothesis is based on one’s personal opinion. A good
    12·2 answers
  • The respiratory exchange ratio (rer) is a way of determining the body's metabolism of:
    12·1 answer
  • WORTH 25 POINTS PLEASE ANWNSER AND DONT GUESS
    11·1 answer
  • In some jacana species, males take care of the eggs and young, and females compete among themselves for territories that contain
    7·1 answer
  • If you weigh 150 pounds on Earth,
    5·2 answers
  • The bones of the arms, legs, pelvis, and shoulder area
    13·1 answer
  • Please can someone please answer the question it’s already past due
    15·2 answers
  • Which of these is an abiotic infectious agent?
    6·2 answers
  • Scientists have genetically-engineered some strains of bacteria to consume toxins, such as oil, and to excrete the toxins as har
    12·1 answer
  • Following the production of membrane extracts using the non-ionic detergent Triton X-100, you analyze the membrane lysates via m
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!