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
serious [3.7K]
3 years ago
13

Cells need to bring in molecules to carry out cellular processes. Often, this requires moving the molecules across the cell memb

rane against the concentration gradient. How do these molecules get into the cell?A. passive transport by diffusionB. active transport using ATPC. passive transport by osmosisD. phagocytosis
Biology
1 answer:
aniked [119]3 years ago
5 0

Answer:

B (active transport using ATP)

Explanation:

Movement of substances normally occur in the direction of concentration gradient/difference i.e. the difference in concentration of a substance across a membrane. Letting molecules diffuse or pass down their concentration gradient does not require energy but pumping those molecules against gradient requires energy in form of Adenosine triphosphate (ATP). This process is called Active transport.

In order to perform certain cellular processes, cells need to move substances from their surroundings into the cell across their cell membrane. Moving this substances against the concentration gradient between the cell membrane and its extracellular fluid requires energy (ATP).

An example is the sodium-pottasium pump employed by animal cells in which they expend energy to move K+ molecules into the cell and Na+ molecules outside the cell against the concentration gradient of their cell membrane and extracellular solution.

You might be interested in
How many set of nerves are there in the human body ​
seropon [69]

7 trillion nerves in the human body. All these nerves are part of what's known as your body's nervous system.

8 0
2 years ago
A young adult is exposed to a virus that infects and replicates in mucosal epithelial cells of the upper respiratory tract. One
marishachu [46]

Answer:

The CTL has specific receptors that can recognize infected or damaged cells.

Explanation:

The cytotoxic T cells (CTL) is a type of white blood cells that specifically helps in destroying virus-infected cells (also damaged cells and cancer cells).

This type of cells has a special receptor called T-cells receptors (TCR) which ones recognize specific antigens (molecule that stimulate the immune systems because are “strange” to them). Virus inside a cell could bind to a special molecule called class I MHC, this molecule moves the virus to the surface of the cell where it can be recognized by a CD8+ specific antigen-receptor of the CTL.

3 0
3 years ago
Short Story
arlik [135]

Answer:

and the other questions you have the arm to

7 0
2 years ago
Which of the following statements about the Australian koala is true? a. The animal can only live in Australia.b. Its habitat ca
Rudiy27

Answer:

Option A, The animal can only live in Australia

Explanation:

At present the Koala are found in several states of Australia such as  

a) Queensland

b) NSW

c) Victoria

d) South Australia  

Though the Koala is found on the eucalyptus trees  of the  temperate rain forest , they are only found in Australian geographies . There are several other place on planet earth where there is rainforest with eucalyptus trees and temperate climate, even though the Koalas are limited to Australia.  

Hence Option A is correct.

6 0
3 years ago
Read 2 more answers
If a bug has 10 chromosomes in his body cell. Why will his cells have 10 chromosomes after MITOSIS?
max2010maxim [7]
Would have 20 chromosomes
8 0
3 years ago
Other questions:
  • Is a dragon fly a insect
    7·2 answers
  • How can the design of a building, such as a concert hall, reduce unwanted noises and echoes?
    6·1 answer
  • Which system is responsible for defending the body against harmful substances
    15·2 answers
  • Which of these options is a simple sentence? Select one: a. This cave is full of bats; I don't want to go inside! b. I don’t wan
    6·1 answer
  • Plz help.................
    7·2 answers
  • Vitamins and minerals keep the blood healthy. Which part of the blood carries minerals, vitamins, and other nutrients to the bod
    7·1 answer
  • How does the process of photosynthesis create food?
    10·2 answers
  • Potatoes are high in carbohydrates?
    11·2 answers
  • Please help!!
    12·1 answer
  • sub-saharan africans show the largest genetic diversity of any human population. this is likely to have resulted from a. a small
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!