Biology College
Answers
Answer 1
Explanation:
Membranes
Recall that phospholipids have a hydrophobic end and a hydrophilic end and that when placed in water they will orient themselves accordingly (5.11 pg 79). This is the basis for the plasma membrane of a cell. The cell membrane consists of a phospholipid bilayer with embedded proteins. We refer to the modern conceptual model of the cell membrane as the "fluid mosaic" model since the phospholipids are able to move about across the surface of the membrane (fluid) and the proteins are many and varied (mosaic) (5.12).
Attached to the some proteins and to some of the phospholipids are oligosaccharides (short polysaccharides). When a protein has an oligosaccharide attached it is called a glycoprotein. Glycolipids are phospholipids with the sugar chains added. These oligosaccharides are found on the outside of the membrane and are used in cell to cell recognition. They differ among species, among individuals and within individuals.
Membrane proteins can have a number of functions, such as transport proteins, enzymes (more on these shortly), receptor sites, cell adhesion, attachment to the cytoskeleton. (5.13)
The most important thing about membranes is that they regulate what moves in and out of a cell. The membrane is selectively permeable because substances do not cross it indiscriminately.
Some molecules, such as hydrocarbons and oxygen can cross the membrane. Many large molecules (such as glucose and other sugars) cannot. Water can pass through between the lipids. Ions such as H+ or Na+ cannot.
Transport proteins make passage possible for molecules and ions that would not be able to pass through a plain phospholipid bilayer. Some transport proteins have a hydrophilic tunnel through them which allows polar molecule or ions to pass. Others actually bind to the molecules and move them across the membrane. In either case transport proteins are very specific.
Passive Transport
Related Questions
What do you notice about the products of cellular respiration compared to the reactants of photosynthesis
Answers
Photosynthesis converts carbon dioxide and water into oxygen and glucose. Glucose is used as food by the plant and oxygen is a by-product. Cellular respiration converts oxygen and glucose into water and carbon dioxide. Water and carbon dioxide are by- products and ATP is energy that is transformed from the process.
12. Given the human pedigree to the right, is the trait indicated by
the darkened shapes a dominant or a recessive trait? How can
you tell?
Answers
Answer:
Darkened shapes are recessive
Explanation:
In the pedigree shown, we can see that 2 parents that are unshaded shapes have 2 children that are shaded shapes. This would be impossible if shaded shapes were dominant and unshaded shapes were recessive. This is because parents that have a recessive trait have 2 of the same alleles. So if 2 parents that both have a recessive trait have a child, the child will definitely have that trait. But we can see that this is not the case, the parents have 2 offspring that have different phenotype from the parents. This must mean the parents are heterozygous, meaning that they both have 2 alleles that are different. The dominant allele masks the recessive allele, so the dominant allele is expressed. In this case, the children inherited 2 recessive alleles, 1 from each parent, making them have a different phenotype from the parents.
• How gamete formation leads to genetic variation.
Answers
Answer:
Genetic variationis increased bymeiosis
During fertilisation, 1gametefrom each parent combines to form a zygote. Because of recombination and independent assortment inmeiosis, eachgametecontains a different set of DNA. Thisproducesa unique combination ofgenesin the resulting zygote.
An unjustifiable hostile attitude toward a group of people is:
O A. prejudice.
B. cognition.
C. rationalization.
D. discrimination.
Answers
Answer:
A
Explanation:
Because of the gravity of the earth
Your cat had a liter of kittens. What can you infer about the father cat based on what you see here? Select ALL that apply. Loading... A) The father had black fur. B) The father had was white fur. C) The father provided half of the genetic material to each kitten. D) All of the kitten traits are displayed in either the mother cat or father cat. E) The traits of the kittens depend on the genes they inherited from their parents.
Answers
Answer: C and E
cause i just did it
Which process requires energy from food to help a cell maintain homeostasis?
A. a phosphate ion being released from ATP
B. a phosphate ion being added to ADP
C. the conversion of glucose to oxygen
D. the creation of RNA from DNA
Answers
Answer:
B
Explanation:
which of those identifies the part of the DNA segment label x
Answers
Answer:
I need a picture
Explanation:
Question 3 What is a characteristic of consumers?
Answers
Psychographic characteristics of consumers include interests, activities, opinions, values and attitudes.A company may better understand consumer opinions and attitudes after conducting a focus group, and can use that information to tailor advertising or marketing campaigns.
Explanation:
All igneous rock forms from cooling lava/magma, despite this, not all igneous rocks look the same. For example, some igneous rocks, like granite, have large crystals. The best explanation for this is
Answers
Answer:
depends on the mineral, metal, and compression content
Explanation:
without these variables we wouldnt have the different compositions and varieties of stones.
why most plants cannot survive in deserts?
Answers
Answer:
maybe beacuse there not enough water and its too hot the sun will dry them up
Explanation:
Answer:
Because the ground is not fertile.
and there is too much of sunlight.
Among Delta-back stripped fish, there are two genes that segregate independently of one another. Suppose the alleles at the first locus are A (dominant) and a (recessive) and the alleles at the second locus are B (dominant) and b recessive). If an AABB fish mates with an aabb fish, and their offspring are inter-crossed, the proportion of F2 fish that show a recessive phenotype at the first locus and a dominant phenotype at the second is:
Answers
Answer:
4/16
Explanation:
It is given that the alleles of the first locus = A dominant and recessive a
The allele of the second locus = B dominant and the recessive b.
Now if fish with AABB mates with the aabb fishes, then to tell the proportion of the F2 fish which shows either the dominant phenotype at the [tex]$\text{first locus}$[/tex] and also a recessive phenotype at the [tex]$\text{second locus}$[/tex].
So for this, the recessive phenotype at the [tex]$\text{first locus}$[/tex] as well as the recessive phenotype at the [tex]$\text{second locus}$[/tex] is in the ratio of 4/16.
Using the food web above, what percentage of the total energy entering the system will the hawk receive?
0.1%
1%
Ο Ο Ο Ο
10%
O 100%
Answers
Answer:
The answer is 0.1%
Explanation:
Just finished taking the quiz and I got it right :) Also, it is because the hawk is the tertiary consumer so it will get the least amount of energy
The total energy entering the system will the hawk receive in this food web is 0.1%.
What is the food web?
When many food chains of an ecosystem are interconnected with each other to make a complex web-like structure is known as the Foodweb.
Lindeman gave the 10% law which means at each step of the food chain when food energy is transferred from one trophic level to the next trophic level, only about 10% of energy is passed on to the next trophic level.
Producers (100%) → Insects (10%) → Mouse, Birds (1%) → Hawk (0.1%)
Therefore, the total energy entering the system will the hawk receive in this food web is 0.1%.
To learn more about the Food web, refer to the link:
https://brainly.com/question/17708630
describe a cladogram that would indicate the evolutionary relationships of the four species: African elephants (Loxodonta africana), Asian elephants (Elephas maximus), woolly mammoths (Mammuthus primigenius), and dugongs (Dugong dugon). Here is a blank cladogram to help you. Where would you place the species
Answers
Answer:
6 million years.
Explanation:
Modern elephants i.e. African elephants, Asian elephants etc and dugongs has evolutionary relationships with woolly mammoths because all these species share a common ancestor that split into separate species about 6 million years ago. Elephants and mammoths diverged into their own separate species due to difference environmental conditions. Dugongs is also considered as more closely related to elephants than whales.
Select the most accurate of the following statements: Group of answer choices The vascular bundles of gymnosperms contain xylem only, whereas those of angiosperms contain both xylem and phloem Angiosperms produce specialized shoots bearing modified leaves to attract pollinators and protect gametes All gymnosperms have narrow, needle-like leaves whereas all angiosperms have broad, net-veined leaves Gymnosperm embryos are exposed to the elements, whereas the embryos of angiosperms are packaged with a food source inside a seed coat Gymnosperms have substantially more species than angiosperms
Answers
Answer:
The correct answer is - all gymnosperms have narrow, needle-like leaves whereas all the angiosperms have broad, net veined leaves".
Explanation:
Gymnosperm and angiosperm both possess xylem and phloem in their vascular bundles or vascular tissues for the transport of water and nutrients or minerals respectively.
Angiosperm or the flowering plants are the largest groups of all plant groups and more diverse than other even gymnosperms are less diverse and fewer in number in comparison to angiosperm.
All gymnosperms consist of narrow, needle-like leaves and in angiosperms, leaves are broad, net veined.
The leaves among all gymnosperms are thin and needle-like, meanwhile, the branches of all angiosperms are wide and stream.
Both gymnosperms, as well as angiosperms, have xylem and phloem throughout their vascular tissues just to carry moisture and nutrients as well as rare earth minerals.
Angiosperms, or blooming plants, seem to be the most diverse as well as numerous vegetation groupings. Gymnosperms, on the other hand, have become less diverse but also numerous in contrast to angiosperms.
Thus the above statement is correct.
Learn more about gymnosperm here:
https://brainly.com/question/10524743
If warm air rises, describe what will happen to that air? Will give branliest!
Answers
Answer:
Cold Air Will Sink
Explanation:
As hot air rises cold air will sink, cold air is more heaveir than hot air.
what usually drives animal research is the benefit to human beings of that research?
Answers
Answer:
i dont understand what do you mean. theres a spelling mistake
Explanation:
Answer:
godly floodplain do n gjuydlugfyooguogkffigugkyfigou hkkfuuofugouogugo
Mitosis creates...
A) 4 identical cells
B) 2 identical cells
C) 4 unidentical cells
D) 2 unidentical cells
Answers
Answer:
B) 2 identical cells
Explanation:
"Mitosis is a type of cell division which produces two identical diploid daughter cells. "
Indicate whether the statements below are TRUE or FALSE.
1. You work with two sugars. Glucose (MW = 180 Da) and Sucrose (MW= 342 Da). You make various solutions of each sugar separately and compare them. When you compare two 1-liter solutions containing these sugars at a 10mM concentration, there are more molecules of sucrose in 1 liter because its MW is higher than that of glucose.
2. When you compare two solutions at the same percentage concentration (e.g. 1%), the molarity (= concentration in mole/liter) is higher for glucose because the molecular weight of glucose is lower.
3. When you have 1 liter of a solution containing 90g of glucose, you must use 171g of sucrose to make a 1-liter sucrose solution with the same molar concentration.
Answers
Answer:
Hello! Your answer would be, BELOW
Explanation:
1: TRUE
2: TRUE
3: FALSE
Hope I helped! Ask me anything if you have questions! Brainiest plz. Hope You make a 100%! Have a nice day! -Amelia♥
Sponges are full of holes, jellyfish are big open sacs, and flatworms are flat. How are these features important in facilitating the process of diffusion?
Answers
answer: 23566 + 789 = l i l
These characteristics reduce the distance over which diffusion must occur, making the process of diffusion easier to accomplish. This is because diffusion occurs more quickly over a shorter distance.
Why animals use diffusion?
The acquisition of oxygen by an aquatic organism from the surrounding water is referred to as aquatic respiration. This is accomplished by the process of oxygen diffusion. The process of water and blood flowing in opposite directions across the gills of a fish is known as countercurrent flow. This allows the fish to maximize the amount of oxygen that can diffuse through their bodies.
Porifera, also known as sponges, are sessile animals, which means that they are unable to move on their own and normally remain attached to whatever surface they are living on. They acquire nutrients via the movement of water throughout their cells, and they exchange gases via the straightforward diffusion of molecules across the membranes of their cell walls.
Learn more about diffusion, here:
https://brainly.com/question/21139388
#SPJ2
Earthquake waves travel in all direction from the focus of an earthquake.
T
F
Answers
It should be true because that is usually what happens when energy is released from an earthquake.
Which statement about solar prominences is true?
a.all of these
b.they are never visible, even during a total solar eclipse
c.they can reach thousands of kilometers into the suns atmosphere
d.they last at most for a few minutes
Answers
Answer:
c. they can reach thousands of kilometers into the sun's atmosphere
Explanation:
A planet can be defined as a large celestial body having sufficient mass to allow for self-gravity and make it assume a nearly circular shape (hydrostatic equilibrium), revolves in an orbit around the Sun in the solar system and has a cleared neighborhood.
Basically, the planets are divided into two (2) main categories and these includes;
I. Inner planets: these planets are the closest to the sun and comprises of mercury, venus, earth and mars.
II. Outer planets: these planets are beyond the asteroid belt and comprises of jupiter, saturn, uranus and neptune, from left to right of the solar system. These outer planets are made mostly of gases (hydrogen and helium) causing them to be less dense than the solid inner planets.
A solar prominence is also known as filament and it can be defined as a large, bright, dense cloud of luminous ionized gas such as hydrogen, sodium calcium, etc., that erupts (extends) from the surface of the sun. It can linger in the corona for a very long time, reaching hundreds of thousands of kilometers into the sun's atmosphere (space).
Hence, the statement about solar prominences which is true is that, they can reach thousands of kilometers into the sun's atmosphere.
Which of the following are crucial to maintaining the balance of
the ecosystem?
Answers
Answer: Human being plays a key role to maintain ecological balance because they have the highest thinking capacity as compared to other living organisms. Sufficient food availability to all living organisms and their stability reflect the existence of ecological balance.
factors that affect one's growth
Answers
genetics, nutrition, fitness, sleep etc.
Answer:
10 Factors That Influence the Growth and Development of a Child:
HeredityEnvironmentSexExercise and HealthHormonesNutritionFamilial InfluenceGeographical InfluencesSocio-Economic Status Learning and Reinforcement
Explanation:
I would like a pretty fast answer, please.
Scientists once thought that life spontaneously arose from nonliving things. It took extensive experimentation and the invention of new technology to confirm the tenets that now make up the cell theory. Now, we don't even question that cells are the basic units of life and only come from preexisting cells. What technology had the biggest impact on the development of the cell theory?
A) centrifuge
B) electrophoresis
C) microscope
D) telescope
Answers
Answer:
Microscope.
Explanation:
Microscopes were extremely influential in the development of cell theory, as they allow us to see down to the level of cells and observe them. Through process of elimination, we know it cannot be a telescope (used for observing large, far away objects) or a centrifuge (separates substances based on density). Electrophoresis is moreso used for DNA, and not for the entire cells.
Help pls. Use vid to answer questions.
vid- DNA replication ( Updated) Amoeba sisters
8 minutes and 11 seconds
Answers
BRUVVVVVVVV I AINT GONN do the whole work sheet
Answer parts A, B, C, D
Photo Attached
a). a microRNA (miRNA) is a small non-coding RNA involved in transcriptional and post transcriptional regulation of gene expression. Given the mRNA molecule below, suggest an example of a complementary 10 nucleotide miRNA. circle or highlight the sequence on the mRNA template to which your miRNA will bind, give the complementary 10 nucleotide sequence and clearly label the orientation of the miRNA molecule.
mRNA region: 5’-GUAGUACUGAUGGUCCAGUACGUGCUAGGUCGCUAGUAGUUCGAUGCAGUAUUAU-3’
b). what is the consequence of this miRNA binding to the mRNA above?
c). what happens when the miRNA is not completely complementary to the mRNA it is attached to?
d). what is one theory explaining the evolution of the RNAi pathway? what important research function has RNAi served since its discovery?
Answers
Answer:
b
Explanation:
Insulin is an example of a toxin that can be a useful in the prescribed amount, but deadly if an overdose is taken.
Answers
The statement is true
1. Give an example of an r-selected species? K-selected?
Answers
Answer: Typical examples of r-species are mice, rabbits, weeds and bacteria, which have a lot of offspring, but a short life expectancy. Examples of organisms undergoing K-selection are tortoises, elephants, people, and sequoia trees: their offspring are few but long-lived.
Explanation:
What is the prediction of weather called?
Please help ASAP!
Survey
Prediction
Forecast
Poll
Answers
the answer is
c. forecast
Excretion is the process of ______. A. exchanging carbon dioxide for oxygen. B. removing metabolic wastes from the body. C. pumping blood throughout the body to supply nutrients and oxygen to cells. D. breaking food down into nutrients that can be absorbed.
Answers
Answer:
B
Explanation:
Metabolic waste is eliminated from an organism.
Answer:
The answer is B
Explanation:
Removing metabolic wastes from the body
