Answer:
Protein channels in the plasma membrane allow the ions to cross.
Protein channels which are present in the plasma membrane of the cell allow the ions to cross the plasma membrane. Thus, the correct option is C.
Channel protein is a kind of protein which is found embedded in the plasma membrane of the cell. Channel proteins function similar to a pore and it allows the diffusion of small ions and water molecules through them. Channel proteins are lipoproteins and these are synthesized in the rough endoplasmic reticulum of the cell near the nucleus.
Ion channels are the transmembrane proteins whose canonical function is the transport of ions and molecules across the plasma membrane to regulate cell membrane potential and also play an essential role in neural communication, nerve conduction, and muscle contraction in the body.
Therefore, the correct option is C.
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What is a igneous rock
Answer:
Igneous rock, or magmatic rock, is one of the three main rock types, the others being sedimentary etc. Igneous rock is formed through the cooling and solidification of magma or lava.
Which of these events would lead to an INCREASE in the size of a population of squirrels?
A. More squirrels are born that die
B. Some squirrels emigrate to a different ecosystem in search of food
C. New predators are added to the ecosystem
D. A large number of squirrels die because of a forest fire
Answer:
A
Explanation:
the answer cannot be D, since dying decreases the population. And it cannoy be c because if new predators are added, there might be others who will eat the squirrels. and b doesnt mean a decreasion or increason. so its neutral. therefor the answer is A
The chart below shows the inferred evolution of some dinosaurs during three time periods in Earth’s history.
Which dinosaur most likely evolved from Coelophysis?Immersive Reader
(5 Points)
Camptosaurus
Triceratops
Theodont
Tyrannosaurus
Answer:
camptosaurus
Explanation:
I think it's correct
The Dinosaur that most likely evolved from Coelophysis is known as Camptosaurus. Thus, the correct option for this question is A.
What is Evolution?Evolution may be characterized as the complete methodology of gradual change that takes place over many generations, during which species of animals, plants, or insects slowly change some of their physical characteristics.
Coelophysis lived during the late Triassic period some 216.5 to 203.6 million years ago. Researchers believe that this small theropod lived on river floodplains where it walked alongside crocodilian-like Camptosaurus. They were small theropod dinosaurs that lived in what is now North America and Southern Africa during the late Triassic.
Therefore, the Dinosaur that most likely evolved from Coelophysis is known as Camptosaurus. Thus, the correct option for this question is A.
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Which is not a characteristic of homologous chromosomes?
A. same length
B. same centromere positon
C. exact same type of alleles
D. same genes
Answer:
C. exact same type of alleles
why biology major uses APA?
For more than a decade, Greenland has been losing about 600 trillion pounds of ice per year. The change in the distribution of weight on Earth changes how Earth wobbles on its axis. How can a change in Earth's wobble affect Earth's climate ?
A. Wobbling away from the sun can cool down regions.
B. Wobbling in the direction of the sun can cause large ice sheets to form
C. Wobbling away from the sun can cause polar ice caps to melt.
D. Wobbling in the direction of the sun can cool down regions .
The cholesterol associated with membranes
- helps stabilize the membrane at body temperature
- is attached to proteins and extends into the environment surrounding the cell
- both a and c
- is an abnormality resulting from a diet high in cholesterol
Answer:
b) It interferes with the movements of the fatty acid tails of the phospholipids.
Explanation:
Cholesterol has many important functions, including its role in membrane permeability, especially the cell membrane, and its role in metabolism. Cholesterol reduces the permeability of lipid membranes. ... Cholesterol helps to restrict the passage of molecules by increasing the packing of phospholipids. Steroid molecule that makes membranes more fluid at low temps and more ordered at high temps.
- Flat, rigid, carbon rings interfere with the movement of phospholipids.
- Smaller and less amphipathic lipid that is only found in animals.
- Sandwiched between fatty acid tails of phospholipids.
The best way to practice sustainable use of rangelands is to
Answer: 1. Rotating the rangelands that are being used.
2. Reducing overgrazing of rangelands.
Explanation:
Rangelands are the sites which are occupied and dominated by vegetation cover mostly the shrubs and herbs. It can be occupied by grasses. Overgrazing by the cattle cause a huge damage to the field of rangeland so it can cause soil erosion and can convert the rangeland on barren land. The regrowth rate is slower than that of the consumption rate of the cattle. So, reduction in overgrazing is advisable to maintain the sustainability of the land. Rotation of the rangelands being used if the cattle are taken to the different grassland for grazing on alternate days then the rangelands can be maintained sustainably.
Organisms in the class Mammalia have characteristics the include (choose all that apply)
а
hair
С
nursing young with milk
being ectothermic
d
giving birth exclusively on land
Why is cigaratte smoking injurious to health ?
Name the enzyme which is present in infants but may be absent in adults.
Explanation:
cigaratte smoking is injurious to health because it affects our lungs,heart and different internal organs of our body which is cause of cancer and other non curable diseases.
Answer:
During smoking the cigarettes fumes make the walls alveoli very thin which causes rupturing of alveoli. This reduces the surface area for gaseous exchange in lungs .
To make up for the reduces gaseous exchange the heart has to pump more blood.
1. Which are the two important roles of the atmosphere?
What happens to oxygen that is produced during photosynthesis?
a. It is used by plants to carry out photosynthesis.
b. It is used by all organisms to carry out photosynthesis.
It is used by all organisms to carry out cellular respiration.
d. It is used only by plants to carry out cellular respiration.
C.
Which characteristic do jawless fish and cartilaginous fish have in common?
jaws
scales
skeleton of cartilage
tube-shaped body
Answer:
C. skeleton of cartilage
Explanation:
i got it right on edge
The process by which plant manufacture their food is called what?
Answer:
It is called photosynthesis
What is the significance of pepsin in this experiment? (Why is it included?)
Question 2 options:
Pepsin is an enzyme, it breaks the bonds within proteins.
Pepsin is an acid, it will dissolve anything.
Pepsin is a basic substance, it will dissolve anything.
Pepsin is the protein we are studying.
al 1
Explanation:
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A man who carries an allele of an X-linked gene will pass it on to
Explanation:
A man passes on his Y chromosome to all of his sons and his X chromosome to all of his daughters. Therefore, the sons of a man with an X-linked dominant disorder will not be affected, but all of his daughters will inherit the condition. A woman passes on one or the other of her X chromosomes to each child.
Which of the following is NOT one of the key characteristics of a well-designed test?
A) standardization
B) reliability
C) validity
D) brevity
Answer:
D) brevity
Explanation:
A test can be defined as an examination or quiz given to a student (pupil) during an academic calendar in order to measure or determine his or her intelligence. It is usually graded based on a set of defined grades or scores.
The key characteristics of a well-designed test includes the following;
I. Standardization: it is important that test is set based on certain criteria and acceptable rules within the education community and curriculum.
II. Reliability: the questions contained in a test should be credible and backed by correct answers.
III. Validity: the test questions should be genuine and authentic across board.
However, brevity simply means succinctness or conciseness i.e the test should be brief and very short in duration.
A student is studying a cell from an unidentified organism. Which feature of the cell provides the strongest evidence that the organisms is a
prokaryote, and not a eukaryote?
The cell contains a nucleus and membrane-bound organelles.
The cell lacks a nucleus and other membrane-bound organelles.
The cell is surrounded by a cell membrane and a cell wall.
The sell is surrounded by a cell membrane, but not a cell wall.
Answer:
aw w
Explanation:
aw w
During Anaerobic respiration, cells make energy without:
Oxygen
Water
Carbón Dioxide
Energy (ATP)
During anaerobic respiration , cells make energy without Oxygen
the energy obtained during anaerobic respiration is 2 ATP
Select the goals of conservation agriculture.
Answer:
Explanation:
Sustainable agricultural practices are intended to protect the environment, expand the Earth's natural resource base, and maintain and improve soil fertility. Based on a multi-pronged goal, sustainable agriculture seeks to: Increase profitable farm income. Promote environmental stewardship.
meaning of epidemic virus pandemic
A pandemic is defined as “an epidemic occurring worldwide, or over a very wide area, crossing international boundaries and usually affecting a large number of people”. The classical definition includes nothing about population immunity, virology or disease severity.
By this definition, pandemics can be said to occur annually in each of the temperate southern and northern hemispheres, given that seasonal epidemics cross international boundaries and affect a large number of people. However, seasonal epidemics are not considered pandemics.
Answer:
The meaning of this answer is...
AN EPIDEMIC is a disease that affects a large number of people within a community, population, or region. A PANDEMIC is an epidemic that's spread over multiple countries or continents.
You decide to create a composting bin for your house. While checking on it one day, you notice that the compost bin has started to smell like rotting eggs. You know that a successful compost bin should not smell like this. You take a sample of the pile and check for the presence of microorganisms under the microscope. You see that there are indeed microorganisms. Given this information, what should you do to resolve the smell of your compost?(1 point)
Creating a tent for the pile to shield it from the sun and heat will help resolve the smell.
Turning the pile to aerate the compost and expose it to oxygen will help resolve the smell.
Adding more “brown” materials to the pile to increase the amount of carbon will help resolve the smell.
Adding more “green” materials to the pile to increase the amount of nitrogen will help resolve the smell.
Answer:
Turning the pile to aerate the compost and expose it to oxygen will help resolve the smell
What does Darwin's theory of evolution suggest?
species change over time
different species can interbreed
extinct species are not related
to living species
animals that look alike are most closely related
Answer:
a.
Explanation:
Kayla observes that plants that grow in the shade have larger leaves than plants that grow in full
sunlight. Based on that observation, which of these might be an advantage of having larger leaves?
F An increase in water supply
G A decrease in water loss
H An increase in light absorption
J A decrease in heat production
Answer:
H sunlight makes make stuff bloom faster and brighter it
A decrease in heat production
This is because if it is in shade, there is bairly any heat applied since sun is a form of heat.
Hope this helps!
The water cycle is a complex system. In it, water changes
states. Sometimes it is a liquid. Sometimes it is a solid. Other
times it can become a gas. What change occurs when water is
boiled?
a Gas becomes a solid.
b Gas becomes a liquid.
C Liquid becomes a gas.
d Saldes loud
Answer:
the answer is c
Explanation:
when water is boiled it becomes a gas
what's a ripple effect
Answer:
You know when a droplet falls into the water and then the water removes that looks like its making O's around where the droplet has fallen? Thats what ripple is.
Explanation:
Now if youre talking about the ripple effect similar to mental health here what it is:
The ripple effect is often used colloquially to mean a multiplier in macroeconomics. For example, an individual's reduction in spending reduces the incomes of others and their ability to spend.
. Describe it in your own words
Answer:
the cycle of the re-growth and how nitrogen affects the elements around us
Explanation: I really just wanted to know if this would help you. hope it did.
Based on the context in paragraph 4, fossil refers to ____________.
a. how igneous rocks were formed over time
b. a trace or print, or the remains of a plant or animal of a past age preserved in Earth or rock
c. layers of sediment building up over time and pressing down, forming rock
4. Sedimentary rock is the second category. These rocks cover most of Earth’s land. Sedimentary rocks are made of pieces of other rocks and shells. Erosion causes rocks to slowly wear away. Erosion can be caused by rain, wind, freezing, and plant roots. Sometimes small pieces of rock are made because of erosion. The small pieces of rock are called sediment. Rivers take sediment to oceans and lakes. The river drops the sediments as it slows down. The sediments settle to the bottom in layers. More and more layers of sediment are dropped over millions of years. The weight from the top layers turns the bottom layers of sediments into rock. This makes some sedimentary rocks look layered. Fossils are often found in sedimentary rocks.
Answer:
b. a trace or print, or the remains of a plant or animal of a past age preserved in Earth or rock
Explanation:
Fossils are remains or prints of extinct species that are slowly filled in with sediment over time.
What is true about the evolutionary relationships between groups of animals on a phylogenetic tree?
a. The closer animals are located on a tree, the more characteristics they share.
b. Animals on a tree are related only if they are on the same branch of the tree.
c. Only the animals close to the bottom of the tree share a common ancestor.
d. The further apart animals are on a tree, the more closely they are related.
Answer:
The closer animals are located on a tree, the more characteristics they share.
Explanation:
The pattern of branching in a phylogenetic tree reflects how species or other groups evolved from a series of common ancestors. In trees, two species are more related if they have a more recent common ancestor and less related if they have a less recent common ancestor.
Chickens that carry both the alleles for rose comb (R) and pea comb (P) have walnut combs, whereas chickens that lack both of these alleles (that is, rr pp) have single combs. From the information about interactions between these two genes, determine the phenotypes and proportions expected from the following crosses:
a. RR Pp × rr Pp;
b. rr PP × Rr Pp;
c. Rr Pp × Rr pp;
d. Rr pp × rr pp
Answer:
Explanation:
Available data:
There are two diallelic genes that code for chickens combDominant alleles R and P express rose comb and pea comb, respectivelyWhen they are together in a genotype, they express walnut combs, R-P-Recessive alleles are r and pGenotypes with only recessive alleles express single combs, rrppSo, genotypes and phenotypes would be like
Walnut combs, RRPP, RrPP, RRPp, RrPp (One dominant allele of each gene)Rose comb, RRpp or Rrpp (only R gene with dominant allele)Pea comb, rrPP or rrPp (Only P gene with dominant allele)Single combs, rrpp (no dominant alleles at all)a) Cross: RR Pp × rr Pp
Phenotypes: Walnut x Pea
Gametes) RP, Rp, RP, Rp
rP, rp, rP, rp
Punnett square) RP RP Rp Rp
rP RrPP RrPP RrPp RrPp
rP RrPP RrPP RrPp RrPp
rp RrPp RrPp Rrpp Rrpp
rp RrPp RrPp Rrpp Rrpp
F1) 12/16 = 3/4 R-P-, Walnut-combed animals
4/16 = 1/4 Rrpp, Rose-combed animals
b. Cross: rr PP × Rr Pp
Phenotype: Pea x Walnut
Gametes: rP, rP, rP, rP
RP, Rp, rP, rp
Punnett square) RP rP Rp rp
rP RrPP rrPP RrPp rrPp
rP RrPP rrPP RrPp rrPp
rP RrPP rrPP RrPp rrPp
rP RrPP rrPP RrPp rrPp
F1) 4/16 = 1/4 = 25% RrPP, Walnut-combed animals
4/16 = 1/4 = 25% rrPP, Pea-combed animals
4/16 = 1/4 = 25% RrPp, Walnut-combed animals
4/16 = 1/4 = 25% rrPp, Pea-combed animals
1/2 = 50% Walnut-combed animals, R-P-
1/2 = 50% Pea-combed animals, rrP-
c. Cross: Rr Pp × Rr pp
Phenotype: Walnut x Rose
Gametes: RP, Rp, rP, rp
Rp, rp, Rp, rp
Punnett square) RP Rp rP rp
Rp RRPp RRpp RrPp Rrpp
Rp RRPp RRpp RrPp Rrpp
rp RrPp Rrpp rrPp rrpp
rp RrPp Rrpp rrPp rrpp
F1) 2/16 = 1/8 RRPp, walnut
2/16 = 1/8 RRpp, Rose
4/16 = 2/8 RrPp, Walnut
4/16 = 2/8 Rrpp, Rose
2/16 = 1/8 rrPp, Pea
2/16 = 1/8 rrpp, single
6/16 = 3/8 walnut, R-P-
6/16 = 3/8 rose, R-pp
2/16 = 1/8 Pea, rrP-
2/16 = 1/8 Single, rrpp
d. Cross: Rr pp × rr pp
Phenotype: Rose x Single
Gametes) Rp, rp, Rp, rp
rp, rp, rp, rp
Punnett square) Rp Rp rp rp
rp Rrpp Rrpp rrpp rrpp
rp Rrpp Rrpp rrpp rrpp
rp Rrpp Rrpp rrpp rrpp
rp Rrpp Rrpp rrpp rrpp
F1) 8/16 = 1/2 = 50% Rrpp, Rose-combed animals
8/16 = 1/2 = 50% rrpp, single-combed animals