why are Some substances allowed to cross the cell membrane while other substances are not?

Answers

Answer 1

Answer:

membranes are semipermeable so only let certain materials in and out; if there are carrier or channel proteins, then passive transport can occur otherwise active transport is required which requires energy.

Explanation:

membranes are semipermeable so only let certain materials in and out; if there are carrier or channel proteins, then passive transport can occur otherwise active transport is required which requires energy.


Related Questions

As a college student, you are no doubt concerned about the grades that you earn while completing your coursework. If you wanted to know how overall GPA is related to success in life after college, how would you choose to approach this question and what kind of resources would you need to conduct this research?

Answers

I am not a college student, I am a Freshman in High School but if I were in college this is what I would say:

In college the GPA of the student is very important and it helps a student obtain good colleges and courses in this regard.

The data collected from college alumni about their careers after college would be the required resource in this case.

What is meant by a research resource?

The kind of research one wants to do and the kind of questions in mind guide the kind of resources required for research. Currently, access to any kind of information for anyone is greater than ever before.

Thus, for good research, it's important to collect data from the right kind of resources. It needs to be located, organized, evaluated, and used for the communication of information.

Various places can be a home for a research resource or be research resources themselves. These can be traditional libraries. Whereas, personal experiences can be important research resources.

Print media, which includes journals, books, brochures, newspapers, and magazines are conventional research resources. Currently, electronic sources found on the Internet are being used. Interviews or surveys can also be considered research resources.

Therefore, to understand the impact of GPA on students' careers, we need to collect data on their careers.

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How are Human made? If you can Answer it your pretty smart wow you good at this

Answers

Answer:

sexual intercourse

Explanation:

yurr

Answer:

Human is made out of cells.

Explanation: Just facts

* I did not go into detail*

does Glycolysis joins glucose to other molecules to make pyruvate.

Answers

Glycolysis is the breakdown of glucose by enzymes releasing energy and pyruvic acid. Can i get brainliest please

A eukaryotic cell has 6 chromosomes, explain what you would get at the end meiosis.

Answers

Answer:

If a eukaryotic cell has 6 chromosomes, the end result after meiosis is two daughter cells with 3 chromosomes each.

Explanation:

Meiosis is the process of cell division by which sex cells or gametes are formed. It is a mechanism of reductive division, since the chromosomal charge of a eukaryotic celldiploid— is reduced by half, that is, haploid cells are obtained.

A diploid eukaryotic cell with 3 pairs (6) of chromosomes, after meiosis produces two haploid daughter cells, with 3 chromosomes each.

This process of reductional division, where the gametes are obtained, aims to ensure that when the gametes of each parent join together they form a diploid cell, the zygote.

The definition of life science

Answers

Answer:

the sciences concerned with the study of living organisms, including biology, botany, zoology, microbiology, physiology, biochemistry, and related subjects.

Could you prepare a 12% v/v solution from a 2% v/v solution

Answers

Answer:

No

Explanation:

Answer:

no

Explanation:

a neap tide has




A.) higher high tides and lower low tides than normal

B.) higher high tides and lower high tides than normal

C.) higher low tides and lower low tides than normal

D.) higher low tides and lower high Tides than normal​

Answers

Answer:

C

.....................

Which processes of the rock cycle have been most important in forming the landforms of Florida?

Answers

Several processes can turn one type of rock into another type of rock. The key processes of the rock cycle are crystallization, erosion and sedimentation, and metamorphism.

Paleomagnetism is..

A. The equipment tied to boats to measure their depths

B. The rock that solidifies from mid ocean ridges

C. The evidence that fossils across continents matched

D. The study of the magnetic qualities of ancient rocks

Answers

c i’ve had same problem

Answer:

C. The evidence that fossils across continents matched

Explanation:

What needs to ocCur for a male to be color blind?

He needs to inherit a copy of the color blindness allele from his father.

He needs to inherit a copy of the color blindness allele from his mother.

He needs to inherit a copy of the color blindness allele from both parents

He needs to inherit a copy of the color blindness allele from either his mother or his father.​

Answers

Answer:

He needs to inherit a copy of the color blindness allele from either his mother or his father.​

nervous system summarise it

Answers

Answer:

The brain and the spinal cord make up the central nervous system. The nervous system is the most complex and highly organized body system. It receives information from the sensory organs via nerves, transmits the information through the spinal cord, and processes it in the brain.

What is the meaning of atomic models

Answers

Answer:

The meaning of atomic model is the smallest quantity of an element that can take part in a chemical reaction.

Explanation:

These students are playing tug-of-war. What will cause one side to win the game?


A. A net force of zero
B. A net force other than zero
C. No applied forces
D. Balanced forces​

Answers

B. A net force other than zero

Hope this will help you :D

Answer:

B

Explanation:

Just took the test on A.P.E.X

Hope this will help!

Thomas and Julie wanted to find out which material would insulate their
teacher's coffee cup and keep the coffee hot for the longest period of
time. They first wrapped her cup with bubble wrap and recorded the
temperature of the coffee once every 15 minutes for 2 hours. They
repeated the investigation, this time using newspaper instead of bubble
wrap, but they got the same results for both materials. Which of the below
is their control or constant variable?
the type of insulation
the temperature of the coffee
the type of coffee cup
The students conducting the experiment

Answers

Answer:

The type of coffee cup

Explanation:

Because the insulation changed

The type of coffee temperature can change

The students can change

A dolphin catches and eats small fish

Which type of organism in this scenario.

A. Consumer

B. decomposer

C. parasite

D. producer​

Answers

Answer:

A

Explanation:

The dolphin ate the fish. He 'consumed' something from the environment. However, this was not parasitic since the dolphin killed, not hurted the fish.

Answer: A don't be mad at meee if it's wrong, get mad at the person above me

Explanation:I'M TAKING THE EXAAAAM =(

what are the negative effects of endangered species?

Answers


Healthy ecosystems depend on plant and animal species as their foundations. When a species becomes endangered, it is a sign that the ecosystem is slowly falling apart. Each species that is lost triggers the loss of other species within its ecosystem. Humans depend on healthy ecosystems to purify our environment.

Answer:

there are several causes of negative effects when there are endangered species but the number one reaseon is if they die it slowly kills the ecosystem one animal at a time if that animal is part of a food system of life chain.

Explanation:

i hope this helps your welcome boos :) <3

When a species becomes endangered, it is a sign that the ecosystem is slowly falling apart. Each species that is lost triggers the loss of other species within its ecosystem. Humans depend on healthy ecosystems to purify our environment.

Which of the following is not a product of cellular respiration?
A) CO2
B) energy
C) CoH 1206
D) H2O

Answers

Answer:

C) CoH 1206 is not a product of cellular respiration

PLS Mark me as BRAINLIAST

I need help with 02.04 science natural selection please help me this is all my points im using

Answers

01.08 ang sagot nasagot namin yan e

What is the antebrachial?

Answers

Answer:

the area of the upper limb between elbow and hand

Prokaryotes do not have a
O genetic information
O cytoplasm
O ribosomes
O O OO
membrane bound nucleus ,
cell membrane
OK

Answers

prokaryotes do not have a membrane bound nucleus

which organ produces male gametophytes in flowers?

Answers

Answer:

anther.

Explanation:

the the microsporangia, which are usually bi- lobed, are pollen sacs in which the microspores develop into pollen grains. these are found in the anther, which is at the end of the stamen- the long filament that supports the anther.

Female killer whales can live for ____ years or more. 50 80 30 60
PLEASE HELP

Answers

Answer:

50 years

Explanation:

which could describe the properties of sedimentary rock?

Answers

Answer:

Sedimentary rocks contain rounded grains in layers. The oldest layers are at the bottom and the youngest layers are at the top. Sedimentary rocks may contain fossils of animals and plants trapped in the sediments as the rock was formed.

Explanation:

Sedimentary rocks are formed by the accumulation and lithification of sediment, which can include sand, mud, and organic matter.

What are sedimentary rocks?

Sedimentary rocks are a type of rock that is formed by the accumulation and lithification of sediment, such as sand, mud, and organic matter. They often have layers, or strata, and may contain fossils and other clues about the environment in which they were formed.

They typically have the following characteristics:

Stratification: Sedimentary rocks often have distinct layers, or strata, which can indicate the environment in which they were formed and the sequence of events that occurred during their formation.
Clasts: Many sedimentary rocks contain clasts, which are pieces of other rocks or minerals that have been incorporated into the sediment. These clasts can provide information about the source materials from which the sedimentary rock was formed.
Fossils: Sedimentary rocks are often rich in fossils, which are the remains or traces of plants or animals that were preserved in the sediment. Fossils can provide information about the ancient organisms that lived in the area where the sedimentary rock formed.
Cementation: Most sedimentary rocks are held together by some type of cement, which can be a mineral such as calcite or quartz, or a chemical bond. The type of cement can affect the physical and chemical properties of the sedimentary rock.
Porosity and permeability: Many sedimentary rocks are porous and permeable, which means they have spaces between the grains and can allow fluids to pass through them. The porosity and permeability of a sedimentary rock can depend on the size, shape, and arrangement of the grains, as well as the type of cement present.

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The process of removing wastes from the cell is known as

A.) endocytosis
B.)exocytosis
C.) pump
D.)channel

Answers

The answer B I hope this help you

Which statement correctly describes the behavior of light as it interacts with the ocean? A. Longer wavelengths of light penetrate the deepest into the ocean. B. Light penetration in the ocean is only to a depth of about 50 meters. C. Blue light penetrates the deepest in the ocean. D. Blue light reflects of the ocean surface, which gives the ocean its characteristic blue color.

Answers

Answer:

D

Explanation:

Makes sense, blue light gets reflected back to our eyes

Which of these are NOT found in plant cells?

a)cell membranes

b)centrioles

c)mitochondria

d)cell walls

Answers

Answer:

It would be the B Centrioles

The answer would be B centrioles because plant cells have all of the following except centrioles. Therefore the sender would be B centrioles.

Many different types of mutations can occur within the body. Sickle cell anemia is a disease that occurs when a mutation in a base pair of the hemoglobin beta gene causes a single replacement of the amino acid glutamic acid by the amino acid valine. As a result of this mutation, the individual’s blood cells take on a sickle shape under certain conditions and form clusters that can block blood vessels and cause organ damage.

The mutation of sickle cell anemia. Red blood cells.

Which type of mutation causes sickle cell anemia?
silent
missense
insertion

Answers

b) Missense

Sickle cell anemia is a inherited blood disorder

Hope that helps :)

Answer:

B. Missense

Explanation:

In modern taxonomy, species are the most
taxa.
broad
complex
specific

Answers

Answer:
Specific
Reason:
I got it right on a test

Species are the most specific in modern taxonomy.

Taxonomy is defined as the scientific method of classifying, identifying and naming living organisms.

In the hierarchy of living organisms, the largest group of organisms is the Kingdom. This is followed by:

Phylum

Class

Order

Family

Genus and

Species (which is lowest in hierarchy).

The species is the smallest unit of classification.

It is the most specific because the individuals within a species are:

Identical in appearance,Closely related and Can mate with one another to produce fertile offspring.

Therefore, species are the most specific in modern taxonomy.

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A control experiment is...

a. is one in which a lead scientist controls a group of scientists conducting an experiment.

b. Is always conducted using one large, random sample group.

c. Is one in which the condition suspected to cause the effect is compared to the same situation without the suspected condition.

d. Rarely provides the answer to a question posed by a theory

Answers

Answer:

C.Is one in which the condition suspected to cause the effect is compared to the same situation without the suspected condition.

Explanation:

Which scientific design has both practical limitations and limitations due to scale?
A.) studying the effect of bleach on the growth of mold spores
B.) exposing cultures of duckweed to different intensities of light
C.) observing the replication of DNA molecules with a hand lens
D.) using colored marbles to model a cross between two colors of rabbits

Answers

Answer:

c. observing the replication of DNA molecules with a hand lens

hope this helps :)

Explanation:

Answer:

C

Explanation: