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
bija089 [108]
3 years ago
8

Which molecules help control movement of substances through cell membranes? A. carbohydrates B. ATP C. DNA D. proteins

Biology
2 answers:
erik [133]3 years ago
5 0

Answer:

D. proteins

Explanation:

The plasma membrane is formed mainly by lipids and proteins. Lipids act by guaranteeing the membrane structure, while proteins are related to the main functions performed by this cell structure.

The proteins present in the plasma membrane are embedded in the bilayer. These proteins may be inserted totally or only partially into the membrane. It is worth mentioning that some act as true channels for the passage of substances. That is, we can say that membrane proteins are the molecules responsible for helping to control the movement of substances across cell membranes.

krek1111 [17]3 years ago
4 0
D. Proteins help control substances by making trans-membrane channels.
You might be interested in
Describe the evidence that suggests that mitochondria were acquired before plastids in eukaryotic evolution.
8090 [49]

Answer:

Mitochodaria is present in majority of cells and plastid is present only in in few.

Explanation:

Endosymbiosis theory explain that mitochondria and plastids arose from bacteria through engulfing by larger cells because mitochondria and plastids contain different DNA than cell nuclei.

Mitochondria were acquired before than plastids because mitochondria is present in majority of eukaryotic cell and some cell have plastids with mitochondria.This explain that after the endosymbiosis of mitochondria some cells did endosymbiosis with photosynthetic bacteria to acquire plastid.

8 0
4 years ago
Read 2 more answers
The most important factor in decreasing the intracellular concentration of calcium ion after contraction is
Veseljchak [2.6K]

Answer:

Active transport of calcium into the sarcoplasmic reticulum.

Explanation:

  • The sarcoplasmic reticulum (SR) is a membrane-bound structure found within muscle cells that is similar to the endoplasmic reticulum in other cells. The main function of the SR is to store calcium ions (Ca2+)
  • In response to an action potential traveling along the t tubule, voltage-sensitive proteins change shape, opening calcium channels in the adjacent terminal cisterns of the sarcoplasmic reticulum.
8 0
3 years ago
Case 12-2 Mother Goose Computing, Inc. provides computational biology consulting services. They are currently updating several o
Reil [10]

Answer:

Direct.

Explanation:

An information system can be defined as a set of components or computer systems, which is used to collect, store, and process data, as well as dissemination of information, knowledge, and distribution of digital products.

Generally, it is an integral part of human life because individuals, organizations, and institutions rely on information systems in order to perform their duties, functions or tasks and to manage their operations effectively. For example, all organizations make use of information systems for supply chain management, process financial accounts, manage their workforce, and as a marketing channels to reach their customers or potential customers.

Additionally, an information system comprises of five (5) main components;

1. Hardware.

2. Software.

3. Database.

4. Human resources.

5. Telecommunications.

Hence, an information system interacts with the overall system by receiving data in its raw forms and information in a usable format.

In this scenario, Mother Goose Computing, Inc. are currently updating several of their systems. For the genomics division, it's planning to replace the old system by the new one all at once. Thus, this is called a direct conversion.

Direct conversion can be defined as a process which typically involves the establishment and implementation of a new system followed by an immediate discontinuation of the old system all at once. Thus, on a particular date and time, the old system would be discontinued while the new system is immediately adopted for use in the particular organization.

8 0
3 years ago
How many different species are marsupials?
zysi [14]
There are about 334 different species of marsupials, a large portion of them being in Australia and in South America.
6 0
3 years ago
Explain the factors that contribute to the success of class insecta. ​
Setler79 [48]

Answer:

It is believed that insects are so successful because they have a protective shell or exoskeleton, they are small, and they can fly. Their small size and ability to fly permits escape from enemies and dispersal to new environments. ... In addition, insects can produce large numbers of offspring relatively quickly.

8 0
3 years ago
Other questions:
  • Within the heart, several structures and several layers all play a part in protecting the heart muscle and maintaining cardiac f
    5·1 answer
  • Photosynthesis involves the transmation of light energy into ?
    13·1 answer
  • A cell from a wheat plant contains all of the following, EXCEPT a
    14·1 answer
  • What are bananas made of
    13·1 answer
  • Microtubules, microfilaments, and intermediate filaments make up the _____, which lies beneath the plasma membrane and provides
    11·2 answers
  • What advantage do flexible water pipes have over rigid pipes during an earthquake?
    5·2 answers
  • Which of these processes describes the effect Earth's atmosphere has on Earth's hydrosphere?
    5·2 answers
  • From the list of x-rays, infrared radiation, ocean waves, sound waves and light waves. Which of these are mechanical waves? help
    7·2 answers
  • Help pls!!!
    7·1 answer
  • What are the tiny openings in leaves that open to take in carbon dioxide and release oxygen?
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!