Question
Asked Jun 6, 2019
155 views

Can you explain ACTIVE transport - more specifically how transport is facilitated by proteins (carriers or pumps) OR bulk transport of molecules. 

check_circle

Expert Answer

Step 1

Movements of ions and molecules in and across the cell membrane are regulated by a set of transport mechanism that is collectively termed as membrane transport mechanisms. The transport mechanisms include simple diffusion, facilitated diffusion, osmosis, and active transport.

Step 2

Active transport is a type of energy-dependent membrane transport mechanism in which the molecules and ions can move across the membranes against their concentration gradient (from lower concentration to the higher concentrated area). This action is accompanied by the breakdown of ATP molecules. There are two types of active transport mechanisms namely-

  • Direct active transport-ATP is directly used for pumping molecules against the concentration gradient.
  • Indirect active transport or cotransport-Here, the ATP is used indirectly. Movement of one molecule across the gradient usually provides energy for the transportation of some other molecules against its concentration gradient.
Step 3

Active transport requires energy expenditure, as it transfers the molecules against their concentration gradient. Movement of molecules through active transport is facilitated by certain proteins. Major types of proteins that facilitate active transport are as follows:

1. Membrane proteins as carrier protein: Carrier proteins are present within the cell membrane that transports the molecule by changing their shape, o...

Want to see the full answer?

See Solution

Check out a sample Q&A here.

Want to see this answer and more?

Solutions are written by subject experts who are available 24/7. Questions are typically answered within 1 hour.*

See Solution
*Response times may vary by subject and question.
Tagged in

Science

Biology

Cell Biology

Related Biology Q&A

Find answers to questions asked by student like you

Show more Q&A add
question_answer

Q: 1. collecting duct 2. glomerulus 3. peritubular capillaries 4. distal convoluted tubule m. a. b. C. ...

A: Nephron is the basic structural and functional unit of the kidney. As blood passes through the kidne...

question_answer

Q: The sarcoplasmic reticulum Ca2+-ATPase, pumps 2 mol Ca2+ out of sarcomeres per mol ATP hydrolyzed. G...

A: The formula to calculate ΔG is given by the below formula, where ΔG is the free energy change, R is ...

question_answer

Q: Hello! I have a topic to discuss for tommorow! The question goes like this: Discuss how the genetic ...

A: Click to see the answer

question_answer

Q: What tissue type is in the following Maxilla, mandible, Alveolar Margins, Hard and soft palate, orop...

A: The mandible forms the lower jawbone of the humans. Being a bone, it is composed of hard osseous tis...

question_answer

Q: What is the tissue types of the following? Peritoneum, Mesentery, Duodenum, Jejunum, Illium, Villi, ...

A: The gastrointestinal system or digestive system is an organ system of humans and mammals which invol...

question_answer

Q: 3a. Which phylum has the most ancient lineage?

A: Phylum is the second highest taxonomic after Kingdom. Large number of organisms sharing one or more ...

question_answer

Q: What blood cell type does vivax infect?

A: Plasmodium vivax is a protozoan, which acts as a pathogen in humans. It has been implicated as the m...

question_answer

Q: 2. Based upon your inspection of the drawings (# 1), what is the difference in the pattern of vessel...

A: Dear student, as you have not mentioned the question number to be answered, we are entitled to answe...

question_answer

Q: What are some ways that the biocultural perspective has been used to study either early hominins or ...

A: The branch of science that is aimed to understand the relationship between human biology (at gene le...