Xylem is a vascular tissue that transports water and minerals. It is composed of tracheids, vessel elements, and xylem parenchyma.
Features of xylem:
• conducts water ,(4)
,• tracheids & vessel elements = both are hollow and elongated cells. ,(2,7,9)
,• Dead at maturity, ,(10)
,• Functions in transpiration, ,(1)
,• Comprises wood ,(12)
Phloem is a vascular tissue that transports organic compounds like glucose from the site of photosynthesis to other parts of the plant. It is composed of sieve cells, companion cells, phloem parenchyma, and phloem fibers.
Features of phloem:
• Conducts carbohydrates and amino acids ,(3,6)
,• Sieve tube members, sieve cells, companion cells = Connected as hollow tubes ,(2,5,11,13)
,• Living at maturity ,(8)
Amylose differs from amylopectin in that amylose ________. Amylose differs from amylopectin in that amylose ________.
A. Forms a helix and no branch points
B. Is highly branched and amylopectin
C. is not Has more glucose residues than amylopectin
D. Has different monomers than amylopectin
Amylose differs from amylopectin in that amylose Has different monomers than amylopectin.
Amylose are linear Amylopectin are branched . Amylose is a straight-chain polymer in which a 1,4-glycosidic bond links D-glucose units. Amylopectin is a branched-chain polymer in which 1,4 and 1,6 glycosidic bond links D-glucose units.
Other difference include Amylose has glucose units joined in a continuous chain like beads on a string whereas amylopectin has branched chains of glucose units. Amylose is a polysaccharide consisting of α-1,4-glycosidic bonds .Amylopectin is a polysaccharide consisting of α-1,4 linkages .
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Dexter is a student who has learned about the neritic zone. His teacher has given him names of components of the abiotic and biotic factors. He has to categorize them. In which categories would the sea turtle fall?hardshell substrate temperature detritivore reptile
- Biotic factors are living organisms that take part in an environment, for example, plants and animals are biotic factors.
- Abiotic factors are all non-living parts of an environment, for example, the temperature, the soil, the sunlight, etc.
The shell is the part of a living organism, so it can be classified as a biotic factor.
A reptile is an animal member of the class Reptilia, they can be classified as biotic factors.
The sea turtle is a living organism, so it can be classified as a biotic factor.
The temperature is a non-living part of the environment, it can be classified as an abiotic factor.
The substrate is the base where living organisms live, for example, the bottom of the marine habitats formed by rocks, sand, or gravel), it can be classified as an abiotic factor.
Detritivores are organisms that feed on dead organisms and decomposed matter, they can be classified as biotic organisms.
Within the domain Eukarya organisms are placed into four kingdoms. A certain Organism ismulticellular with cell walls and absorbs nutrients from decaying organic matter period to whichKingdom does this Organism most likely belong?A. AnimaliaB. fungiC. plantaeD. protista
An organism that is multicellular with cell walls and absorbs nutrients from decaying organic matter is referred to as Fungi. It belongs to the Kingdom Fungi
An ecosystem is a community of living organisms and their interactions with their abiotic environment. Group of answer choicesTrueFalse
The environment can either be biotic or abiotic. These make up an ecosystem. The community of living organisms in an ecosystem is making an interaction with their abiotic environment as well as with the other living organisms present in the ecosystem.
Answer - False
Which of the following is the EON in which we now live?A. ArcheanB. PhanerozoicC. DevonianD. Paleozoic
We live now in an eon of 542 million years in which abundant animal and plant life has existed. It is the Phanerozoic eon. Therefore, the correct answer is B. Phanerozoic.
In a feedback loop the specific variables that is changing and that the body is regulating is called the?
The stimulus or physiological variables is the item to be regulated, the maintenance of the feedback loops for the body regulation is called homeostasis (internal activity balance) that is a process that controls the stimulus to each function and how they triggers the response from the body activity. Receptors detects the changes in stimulus and Integrators compare the variable in relation to a set point to singnal the effectors to generate a physiological response.
Somo of the most showed examples of the homeostasis and the feedback loops are:
-Control of body temperature;
-Control of blood glucose.
Resume:
-The name of the process that controls the balance of the physiological variables of the body is: Homeostasis;
-The responsible to start a feedback loop is: the Stimulus (positive or negative);
-The stages for a feedback are: Stimulus ---> Receptors ----> Integrators -----> effectors;
Therefore, for this process the variable that changes in a feedback loop is the stimulus.
5. A true-breeding green pea plant is crossed with a true-breeding green peaplant, and all the offspring are the recessive green color. What is the mostlikely genotype of the offspring assuming a single-gene trait?A. yyB. YYC. Yy
True-breeding means that the plant is 100% pure and has not been crossed with a different variety. When two true-breeding green peas were crossed, they will produce offspring that may either express purely dominant traits or express purely recessive traits. In this case, all of the offspring possess the recessive green color. This means both parents and offsprings have the same genotype.
ANSWER: This genotype is A. yy.
What are three main differences between how plant and animal cells are structured?
The three main differences between plant and animal cells are:
1. Plant cells have a cell wall, a structure that's located outside the plasma membrane to protect the cell. Animal cells will never show a cell wall.
2. Plant cells have chloroplasts, organelles needed for photosynthesis to take place. This is what makes a plant an autotroph. Animal cells will never show a chloroplast.
3. Plant cells do not have centrioles and centrosomes, but animal cells do. Also, plant cells always shows one or a few large vacuoles, while in animal cells vacuoles are small and in a large number.
Which of the following events occurs in the process of meiosis?OOOOOne diploid cell divides two times resulting in 4 haploid cells.Crossing over occurs between non sister chromatids.Random segregation occurs.All of these choices are correct.
- All of these choices are correct.
Bacteria that require oxygen to
live are known as ...
A. eukaryotes.
B. obligate anaerobes.
C. obligate aerobes. This
D. facultative anaerobes.
Answer: Obligate Aerobes
Explanation:
In most cases, these bacteria require oxygen to grow because their methods of energy production and respiration depend on the transfer of electrons to oxygen, which is the final electron acceptor in the electron transport reaction.
Places in the US that protect the species that live in.
Areas were the native species that live there are protected are called protected areas or conservation areas. I
Are cloning and genetic engineering ethically right?explain
Answer:
The process is considered unethical (read explanation)
Explanation:
Genetic engineering is a gateway to a slippery slope of unethical testing, which can cause loss of human life and we'll start using it for non-therapeutic reasons. Due to the amount of testing that has been done on genetic engineering, we don't know much about it.
What animals in the Epipelagic Zone are producers, consumers and decomposers?
The epipelagic zone is the illuminated zone at the surface of the sea in which enough light is available for photosynthesis to happen. The producers that live in this area includes cyanobacteria, floating seaweed and phytoplanctons. The consumers in this area can be represented by herbivorous and carnivorous zooplanctons, fishes, whales, dolphins and squids.
The 2nd question on the paper and I need help with an explanation
It`s the left atrium. When the regurgitation happens into the left atrium (blood flows backward through the mitral valve), blood will be directed to the lungs, which will increase the workload in the heart.
List one natural causes of deforestation. List one human-related cause of deforestation.
Answer:
One natural cause of deforestation could be a forest fire.
One human related cause of deforestation would be logging for wood.
Explanation:
occasionally, a bismuth preparation is added to the treatment regimen for duodenal ulcers. what are bismuth's effects against h. pylori organisms.
The effects of bismuth on Helicobacter pylori are bactericidal. These effects can be: complex formation in the bacterial wall and periplasmic space, inhibition of different enzymes, ATP synthesis, as well as adherence of the bacteria to the gastric mucosa.
Helicobacter pylori is a gram negative bacteria bacteria found inside the stomach of humans. They are responsible for causing infections like ulcers inside the stomach. The symptoms include nausea, stomach pain, loss of appetite, etc.
Gastric mucosa is the layer of mucus inside the stomach. The layer consists of glands and the gastric pits. The function of mucus is to lubricate the food coming inside it so as to facilitate its digestion.
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Is Kudzu considered an autotroph ? Explain shortly (1-2 sentences)
Kudzu can be considered an autotroph because kudzu vine can cover forest plants and kill them by competing with them for sunlight. This vine has a significant impact on forest ecosystems.
Kudzu spreads swiftly and out of control by runners (stems that root at the tip when in contact with moist soil), rhizomes, and vines that generate new plants by rooting at the nodes.
Kudzu grows at a rate of one foot per day after it is established, and its mature vines can reach a length of 100 feet. Fast-growing invasive plants like kudzu outcompete anything from native grasses to fully developed trees by blocking the sunlight needed for photosynthetic activity.
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I need help, please!!!
11. A person without the allele for sickle cell anemia has children with a person who is a carrier for sickle cell anemia but doesn’t have the disease. What percentage of their children will have sickle cell anemia? What percentage of their children will be carriers for sickle cell anemia? Show your work with a Punnett square. You can copy/paste the blank table below or create a table in the submission box to complete the Punnett square.
percentage of carrier children: 50%
3A genetic mutation occurs in a rabbit's muscle cell. This genetic mutation will be passed on toOA. the cells of the rabbit's offspring.OB. cells that are produced when the mutant cell divides.OC. the cells that are next to the mutant muscle cell.OD. the existing cells in the rabbit's body.ResetSubmit
It's needed to consider that we have two kinds of cells: somatic cells (which have 2 chromosomes inherited from our parents; 2n), and sexual cells (which have only one chromosome, inherited only from one of our parents; n). This is crucial to understand that somatic cells, whose genetic information we do not inherit, and sexual cells, whose genetic information we do inherit, differ in how they divide themselves. The first one, although they divide themselves, they can't pass a mutation to the offspring, while sexual cells can do, or the B option, which states "cells that are produced when the mutant cell divides".
Below, determine if these are correct abiotic factors • the depth of a body of water (lake, river, pond) • the climate of an area (example: North Alabama is considered a temperate climate)• the width of a lake, river, pond, etc..• the season (example: July)
Abiotic factos are non-living chemical and physical parts of the environment that can affect the ecosystems and the living organims. The depth of a body of water, climate, width of a body of water and the seasons are all abiotic factors.
True or false: ATP synthase converts ADP into sugars
*if false, state what it really converts into
It is a false statement that ATP synthase converts ADP into sugars. It converts ADP to ATP.
What is ATP synthase?The ATP synthase is an enzyme that is responsible for the production of ATP from ADP. The term ATP is adenosine triphosphate while the term ADP is adenosine diphosphate.
We know that the enzyme ATP synthase is a precursor, in the presence of the precursor, there is the conversion of the ADP into ATP which is the energy molecule of the living cells.
It is not true, from the discussion above that the role of the enzyme is to convert ADP to sugars.
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The best method for determining if a woman may be a carrier of the trait for color blindness is to
give her an eye examination
analyze a sample of her red blood cells
analyze a sample of her urine
check her family pedigree for the trait
1. Give her an eye examination
2. Analyze a sample of her red blood cells
3. Analyze a sample of her urine
4. Check her family pedigree for the trait
Briefly explain digestion
Digestion is the process by which the digestive system assimilates the necessary substances (energy, minerals and vitamins) from the food consumed, which then are transfered by the circulatory system to every cell of the body.
Do you think the risks of the gene drive getting into another species are worth gaining biodiversity in an ecosystem?
Using gene drive to control on invasive species could damage the environment in ways that are very hard to predict, by causing unintended consecuences.
For example, while intending to affect only a local population, gene drive could spread to an entire species by the return of any individual of the species to its original habitats. This could be by migration, accidental human tranportation, intentional relocation or a different way. If this happens it would drive the entire species to extintion causing damage to the ecosistem as it would affect other species that interact with the original.
It is important to acknowledge that the use of gene drive has permanent consecuences and that it is very hard to predict the effect it will eventually have in the ecosystem.
Also, there are ather ways that sould be considered to control invasive species such as the intentional manipulation of natural enemies, use of pesticides or herbicides, manipulation of the habitat to increase mortality, etc.
Moreover there is the possibility of affecting other non-target species that are able to interbreed with the original, causing a permanent damage in the ecosystem.
In conclution, the risks of gene drive may not be worthy, specially because the damage will be permanent and the real effect it will have is extremly hard to predict.
Summarize how scientists use evidence from rock strata to create a geologic time scale and organize Earth's 4.6 billion year history. In your response be sure to include the following:How do they divide the time periods/events of the 4.6 billion year history?Explain how they interpret rock age using relative dating principlesWhat are some examples of evidence they use from the rock strata?
The geologic time scale was developed after scientists observed changes in the fossils going from oldest to youngest sedimentary rocks. They used relative dating to divide Earth's past in several chunks of time when similar organisms were on Earth.
Scientists divide Earth's entire 4.6 billion years into four major time periods. The oldest — and by far the longest — is called the Precambrian. It is divided into Eons known as the Hadean (HAY-dee-un), Archean (Ar-KEY-un), and Proterozoic (Pro-tur-oh-ZOE-ik). After the Precambrian come to the Paleozoic Era and Mesozoic Era.
In interpreting rock age the use of relative dating puts the sequences of rocks layers into chronological order. Although the layers are no longer horizontal, geologists are able to determine their order.
Examples interpreted from rock strata provide a way to organize Earth's history. Analyses of rock strata and the fossil record provide only relative dates, not an absolute scale. phenomena can be observed at various scales using models to study systems that are too large or too small.
After seeing variations in the fossils as they moved from oldest to youngest sedimentary strata, geologists came up with the geologic time scale. Relative dating was used to split Earth's history into periods when comparable creatures were present.
What is a geologic time scale?Relative dating is used to chronologically organize the strata of rocks in order to understand rock age. Geologists can still discern the sequence of the strata, despite the fact that they are no longer horizontal.
Earth's history may be organized using examples derived from rock layers. The fossil record and the analysis of rock layers only reveal relative dates an absolute scale is not provided.
Therefore, to examine systems that are too huge or too tiny, events can be seen at multiple sizes using models.
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Would the DNA of Corynebacteriumtuberculostearicum and Acinetobacter baumanniidetected by polymerase chain reaction make aneasily recognized antigen?
No, DNA won't make an easily recognized antigen because the basic structure of DNA is similar to all microbes, so DNA won't be enough to specifically recognize these two microbes.
An antigen in immunology is a molecule, molecular structure, foreign particle, pollen grain, or other foreign substance that may attach to a particular antibody or T-cell receptor. Antigens present in the body might cause an immunological reaction. The word "antigen" originally referred to something that produces antibodies. Proteins, peptides (chains of amino acids), polysaccharides (chains of monosaccharides/simple sugars), lipids, and nucleic acids can all be considered antigens.
Antibodies and T-cell receptors are examples of antigen receptors that can identify an antigen. Immune system cells produce a variety of antigen receptors, giving each cell a specificity for a single antigen. Only lymphocytes that are able to detect an antigen are activated and enlarged after being exposed to it, a process known as clonal selection.
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Primate TraitsChimpanzees and gorillas are genetically similar, sharing more than 98 percent of their DNA. While they have many of the same body parts, the details of these body parts differ. between the two species. Chimpanzees and gorillas. have a difference of 2 percent in their DNA. sequences, but that difference represents more than 35 million base pairs that differ in the chromosomes of every cell. These base-pair changes account for the physical differences seen between the two species. One difference between the two species is the shape of their hands and feet. Figure 1 compares the hand and a foot of a chimpanzee and a gorilla. Figure 1. Chimpanzee and Gorilla Hands and Feet
Chimpanzee- their hands are much longer and narrower; do not have opposable thumbs; their big toes are opposable
Gorilla-have broad hands and feet; opposable thumbs and opposable big toe
Opposable means that it is capable of moving freely and independently.
You started a bike ride and are
getting warm. What systems are
involved in causing your temperature
to rise in this scenario?
The green pigment in plants that traps light energy is:cristae.chlorophyll.thylakoids.ATP Synthase.ОС
Chlorophyll is the natural compound present in green plants that gives them their color. It helps plants to absorb energy from the sun as they undergo the process of photosynthesis. This nutrient is present in green vegetables and other plant-based foods, like algae.
Answer: Chlorophyll
In an antibiotic sensitive test, for a certain antibiotic E, the inhibition zone diameter/mm in a bacterial culture is such thatResistant≤12 Sensitive≥15How is the antibiotic described for the said bacteria for range 13 - 14?
Antimicrobial susceptibility testing(AST) is a laboratory procedure to identify which antimicrobial regimen is specifically effective for individual patients.
The zone of inhibition is a circular area around the spot of the antibiotic in which the bacteria colonies do not grow.
Zone of inhibition can be used to measure the susceptibility of the bacteria towards the antibiotic.
In question
the antibiotic described for the said bacteria for range 13-14 will considered as INTERMEDIATE.
Resistant means the bacteria can grow even if the drug is present.This is a sign of an ineffective antibiotic.
INTERMEDIATE means a higher dose of the antibiotic is needed to prevent the growth.