The correct answer is: carrier proteins expend energy to pump substances across the membrane against a concentration gradient, whereas channel proteins provide passage via facilitated diffusion of substances without expending energy.
Carrier proteins and channel proteins play different roles as gatekeepers of the cell membrane. Carrier proteins are involved in active transport, which requires the expenditure of energy (usually in the form of ATP) to transport substances across the membrane against their concentration gradient. Carrier proteins undergo conformational changes to bind with specific substances on one side of the membrane and transport them to the other side. This process allows carrier proteins to move substances against their concentration gradient, from an area of lower concentration to an area of higher concentration.
On the other hand, channel proteins facilitate the movement of substances across the membrane via facilitated diffusion. They form pores or channels in the membrane, providing a passageway for substances to move through. Channel proteins do not require the expenditure of energy and allow substances to move down their concentration gradient, from an area of higher concentration to an area of lower concentration. This process is known as passive transport.
Therefore, carrier proteins and channel proteins differ in their energy requirements and the mechanisms by which they transport substances across the cell membrane.
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Jamaal drove to the mountains to go camping. He drove 300 miles in 5 hours. What was his average speed?
Answer:
Speed=60 miles / hour.
Explanation:
Average speed = Total distance traveled by object / time to cover distance
=300/5
= 60 miles per hour
It is scalar quantity which means it is defined by only magnitude.
Each of the food groups in MyPlate provide all of the nutrients you need; therefore, eating from any one group will provide all your daily nutrients.
A. True
B. False
What’s the difference between the flood tide and the ebb tide
The difference between the flood tide and the ebb tide lies in the direction of the water flow relative to the shore.
Flood tide, also known as the incoming tide, occurs when the water level is rising, and the tide is coming in towards the shore. This phase takes place as the sea level rises, approaching high tide. During the flood tide, water from the ocean moves towards the coastline, often replenishing coastal wetlands and bringing in nutrients.
Ebb tide, on the other hand, is the outgoing tide. It happens when the water level is falling, and the tide is moving away from the shore. This phase begins after high tide, as the sea level starts to decrease, leading to low tide. During the ebb tide, water flows back into the ocean, often exposing coastal areas such as beaches, rocks, and marine life that are usually submerged.
The cycle of flood and ebb tides is caused by the gravitational pull of the moon and the sun on the Earth's oceans, along with the Earth's own rotation. Typically, there are two high tides and two low tides each day, with the flood tide transitioning to the ebb tide approximately every 6 hours and 12.5 minutes, due to the moon's orbit around the Earth.
Biomolecues are essential to all living things. Which biomolecule is "B" from the above table?
The fundamental cause of sickle-cell disease is a change in the structure of:
Why is your brain a good scientific tool?
How do organisms use different types of carbon compounds?
What term did mendel used to signify his true breeding first generation?
Which situation would result in a theory being replaced rather than revised? Additional experiments are performed that confirm the existing theory. New information is discovered that contradicts the existing theory. Scientists disagree on how to revise a theory, so they replace it instead. New experiments to confirm the theory yield inconclusive results
Answer:
New information is discovered that contradicts the existing theory.
Explanation:
A theory is tested and the observation may confirm or contradict the theory. When the results of newly conducted tests confirm the theory, then the theory reaches a consensus in the scientific community. After conducting tests if new observation emerges which adds new information about the existing theory then it is revised. However, if new data keeps emerging that contradict the existing theory it will be rather than revised.
The pH indicator bromothymol blue turns yellow when CO2 gas is added to a solution and blue when CO2 is removed from a solution. An experiment will test how the intensity of light affects the rate of photosynthesis in algae. Which of these should be a control for this experiment?
A. Algae that are placed in a yellow solution and keep in the direct sunlight.
B. Algae that are placed in a blue solution and kept in direct sunlight.
C. Algae that are placed in a yellow solution and kept in the dark.
D. Algae that are placed in a blue solution and kept in the dark.
Answer:
The correct answer would be C. Algae that are placed in a yellow solution and kept in the dark.
In a scientific experiment, a control is a variable which is kept constant or unchanged throughout the experiment.
The results of other variables are compared with the control.
It increases the reliability of an experiment.
In the above experiment, algae must be kept in dark in order to prevent photosynthesis and thus, it prevents the utilization of carbon dioxide.
Similarly, the yellow color solution would also act as control as it would help in observing if any carbon dioxide is utilized from the solution. The utilization or removal of the same would convert the solution blue in color.
Which crops provide more than half of the calories consumed by humans?
what is the difference between an atom and an ion.
Answer:
atoms are neutral or they have equal number of proton and electron but ions can be cation(positively charged) or anion(negatively charged) based on the number of electron the atom lose and gain respectively.
A population is growing at a rate of 2 ,4, 8, 16, 32. Which type of growth does this describe?
The right answer is exponential.
In mathematics, economics and biology, we speak of an exponential (or geometric) growth phenomenon when the growth in absolute value of the population is proportional to the existing population, ie when the growth rate intrinsic is constant and positive.
When the phenomenon of exponential growth is continuous, we can model it by means of an exponential function: Nt = N0 exp (r.t)
N (t) is the number of individuals at time t, N (0) the number of individuals at time 0, r the intrinsic growth rate and t time, exp () being the Euler constant of approximately 2.718 .
DNA of the guilty suspect could be obtained from all of the following except ____. *the handle of a carpenter's hammer used in the crime
*the steering wheel of the suspect's car
*the doorknob of the room where the crime took place
*the suspect's online bank account
Answer:
The suspect´s online bank account.
Explanation:
All the other options could be charged with suspect´s DNA because they were all instruments used during the crime. They are part of what is called the crime scene. These types of scenes contain physical evidence about who committed the crime and how it was perpetrated.
I hope this answer helps you.
The orbital cavities , nasal cavity, paranasal sinuses, and the oral cavity are all located in what region of the body
These are all part of the head or skull. The cavities of the skull surround and protect the brain and sensory organs. There are five kinds of cavities of the skull which are:
nasal cavity (paranasal sinuses is included here) - The nasal septum split the respiratory system into two lateral halves, the nasal cavity is also part of the respiratory system.
cranial cavity - The large cranial cavity is split into a posterior cranial fossa and an anterior cranial fossa, a middle cranial fossa. Its function is to support the brain.
oral cavity - The oral, or buccal, cavity (commonly called the mouth) is a cavity of the head rather than a cavity of the skull because of its fleshy and muscular floor.
orbital cavity - supports and defends an eyeball and its linked muscle, vessels, and nerves.
middle ear cavity - From outer to inner, three small bones-malleus, incus, and stapes are situated within the middle-ear cavities in the petrous part of the temporal bones.
Which molecule do plants use to store extra glucose?
A. Glycogen
B. Myosin
C. Lipid
D. Starch
Answer:
Option D, Starch
Explanation:
Starch is a polysaccharide which is used to store extra glucose in plants. Plant produces glucose (sugar) during the process of photosynthesis in the presence of sunlight. Plant then uses this sugar to produce energy in the form of energy molecules ATP. Extra sugar which is stored in starch is used by plants whenever they need energy. A small amount of glucose is taken from starch to fulfill the energy requirement of plant.
Hence, option D is correct
Which of these is a finger-like sac that has no known function in humans?
What is the difference between an iconic bond and a covalent bond?
Select all that apply.
Asexually, fungi can reproduce by _____.
fission
fragmentation
budding
producing spores
I. explain the changes in heart rate between conditions. describe the physiological mechanisms causing these changes.
Final answer:
Changes in heart rate between conditions can be explained by physiological mechanisms that affect heart function, such as sympathetic and parasympathetic stimulation from the cardiovascular centers in the brain.
Explanation:
Changes in heart rate between conditions can be explained by the physiological mechanisms that affect heart function. For example, during exercise, the heart rate increases to meet the increased demand for oxygen and nutrients in the muscles. The sympathetic stimulation from the cardiovascular centers in the brain, specifically the cardioaccelerator regions, increases heart activity, while parasympathetic stimulation from the cardioinhibitory centers decreases heart activity. Other factors, such as body temperature and blood flow, can also affect heart rate.
A cookies has 122 calories. how many grams of protein are in the cookie if it has 15 grams of carbohydrate and 6 grams of fat?
The lobe of the cerebral cortex which contains the auditory area is the
An inner and an outer membrane are characteristic of which organelle?
Name and describe 3 variations of spiral shaped bacteria.
A.
B.
C.
Three variations of spiral-shaped bacteria include vibrio, which are comma-shaped; spirillum, which have a rigid spiral shape; and spirochete, characterized by their tight, flexible spirals.
Bacteria can present a variety of shapes, and among these, spiral-shaped bacteria are particularly interesting due to their unique physical structures. We can identify three variations of spiral-shaped bacteria: vibrio, spirillum, and spirochete.
Vibrio
Vibrio bacteria are typically curved or comma-shaped rods. These bacteria are known for causing diseases like cholera in humans, which is attributed to Vibrio cholerae. They inhabit aquatic environments and can be recognized by their distinctively curved shape resembling a comma.
Spirillum
Spirillum bacteria possess a rigid spiral structure and tend to be larger than other spiral-shaped bacteria. They are often found in stagnant water and are characterized by their thick, rigid cell wall and flagella, which are used for movement.
Spirochete
Spirochete bacteria are known for their flexible and tight spirals. They move using axial filaments and are the causative agents of diseases such as syphilis and Lyme disease, caused by Treponema pallidum and Borrelia burgdorferi, respectively.
Ramon is looking at pictures of scantily clad women in a magazine. he is focusing on their body parts, particularly their chest and legs. which part of ramon's brain is activated by this viewing
How is osmosis involved in the absorption of water and nutrients?
The name of the full set of genes that provides the instructions for making an individual member of a certain species is the _____.
All the changes that occur as a living thing grows is called
6. Use the experiment below to answer the following questions.
Apple trees are a common type of tree in the northern forests of the United States. In studying one forest, a forester noticed that mature apple trees were abundant but there were very few young apple trees. She wondered why there were so few young trees. By reading the records that other foresters in that area had kept, she learned that the population of deer living in the forest had doubled in the last five years. By reading studies on forests that other scientists had performed, she also learned that deer in similar forests like to eat young apple trees and the young trees of other species.
a. Design a question the scientist could ask that relates to her observations and could be tested.
b. In the experiment, the forester wondered why the forest had many mature apple trees, but very few young trees. Which step of the scientific method does this represent?
c. Which step of the scientific method is “If deer are eating young apple trees, then keeping the deer away from the young apple trees will allow trees to grow.”
d. To test her hypothesis, the forester set up an experiment. She placed fencing around some of the young trees (keeping the deer away) and left other young trees exposed to the deer. Which is the control group?
e. What is the independent variable in the experiment, eaten young trees or the fencing? (Hint: DV depends on IV)
What structures of the cytoskeleton are found in animal cells but not in plant cells?