Answer:
The study reported here presents a comparative screening of three medicinal plants including oregano (Origanum vulgare L.), lavender (Lavandula angustifolia) and lemon balm (Melissa officinalis) having the same geographical origin, the Southeast region of Romania, and growing in the same natural conditions. The contents of total phenolics and total flavonoids for the extracts of these were determined. Furthermore, the total antioxidant capacity was also evaluated. It was found that Origanum vulgare and Melissa officinalis extracts present the most effective antioxidant capacity in scavenging DPPH radicals, while Lavandula angustifolia is less active. High performance liquid chromatography-mass spectrometry analysis was used to identify the components of extracts. Major phenolic acids identified in the analysed species were ferulic, rosmarinic, p-coumaric and caffeic, while predominant flavonoids were quercetin, apigenin kaempherol, which were present as glucosides.
Explanation:
What rocks will likely weather the least
Answer:
Rocks are in dry climate
Explanation:
Several types of rock , like granite, are very repellent to weathering. Moreover, igneous rocks serve to heat slowly because it is difficult for water to penetrate into them.
Which of these produces the cell's chemical energy?
A. Endoplasmic reticulum
B. Membrane
C. Mitochondria
D. Nucleus
Answer:
C
Explanation:
which situation would most likely descreses the carrying capacity for humans in a certain region?
Answer:
Explanation:
The situation that would most likely decrease the carrying capacity for humans in a certain region is a crop disease becomingresistant to medicine.
Complete the statement to describe the calcium concentration that must be maintained in human body cells. The calcium concentration must be greater the cell than the cell.
Answer:
outside the cell than inside the cell
Explanation:
Answer:
abovoe me is correct!
Explanation:
Huntington’s disease: Huntington’s disease is a disease in which certain parts of the brain waste away; symptoms usually begin later in life. In a community in Venezuela, an allele for Huntington’s disease (represented by the letter H) is completely dominant to the allele for no Huntington’s disease (represented by a lowercase h). The three possible parental genotypes are HH, Hh, and hh. There are six possible crossings that can be made between these genotypes (for example, HHxHH, HHxHh, etc.). Show the probabilities of the genotypes and phenotypes in the F1 generation from all six possible crossings. In real human families, would you see offspring in proportions equivalent to these probabilities? Why or why not?
Answer:
Regarding Huntington's disease, it can be said that it is an inherited disease with an autosomal dominant character, so it is enough that one of the children inherits one of these characters to manifest this neurodegenerative disease, it is considered that the pattern is usually 50% of the total of children of sick parents can suffer it, however if both parents are carriers the number rises leading to 100% of the children affected, on the contrary if no parent has the dominant gene and are homozygous recessive, neither your children will suffer the disease
The possibilities are the following:
Parent 1, inheritance pattern: Hh * hh, the possible gametes for this cross-linking are H, H, h, h, offspring; Hh, Hh, hh, hh 50% of the children could be sick
Parents 2, inheritance pattern: hh * hh, the possible gametes for this cross-linking are h, h, h, h. the offspring will be; hh, hh. no sick child
Parent 3, inheritance pattern: HH * HH, the possible gametes for this cross-linking are H, H, H, H, the offspring will be HH, HH, all children may be sick, 100%
parents 4, inheritance pattern: Hh * Hh, the possible gametes for this cross-linking are h, H, h, H. the descendants will be HH, Hh, Hh, hh 50% of sick children
Parents 5, inheritance pattern: Hh * hh, the possible gametes for this interbreeding are H, h ,, offspring will be Hh all sick children
Parent 6, inheritance pattern: Hh * Hh the possible gametes for this cross-linking are H, h, the descendants will be Hh, the heterozygous descendants will have the disease.
With age, somatic cells are thought to accumulate genomic "scars" as a result of the inaccurate repair of double-strand breaks by nonhomologous end-joining (NHEI). Estimates based on the frequency of breaks in primary human fibroblasts suggest that by age 70 each human somatic cell may carry some 2000 NHEl-induced mutations due to inaccurate repair. If these mutations were distributed randomly around the genome, how many genes would you expect to be affected? Would you expect cell function to be compromised?'vVhy or why not? (Assume that 2% of the genome-l.5% coding and 0'5% regulatory-is crucial information.)
Answer:
The size of the human genome is 3.3 * 10^9 bp, as mentioned the coding and regulatory sequences of DNA is 2 percent of the entire genome, that is, 3.3 * 10^9 bp * 2%, which will be equal to 6.6 * 10^7 bp.
Let us assume that there is equal distribution of the 2000 non-homologous end joining induced mutations. Thus, 1 NHEJ shall takes place after every 3.3 * 10^9 bp / 2000, which will be equal to 1.65 * 10^6 bp in genome.
Now, the number of NHEJ in the regulatory and coding region would be,
6.6 * 10^7 bp / 1.65 * 10^6 bp = 40
A maximum disruption of two genes, that is, one at each end can take place by each NHEJ. Thus, the number of genes getting affected by 40 NHEJ would be 80, that is, about 0.38 percent of the entire genes. About 21000 genes encodes protein in human genome.
Yes, the cell function would be compromised as there will be a loss of gene, and at the same time its products, that is, the regulatory RNAs and protein would drastically influence the activity of the cells.
In human blood types, alleles A and B are codominant and are both dominant to allele i. Type O blood results from the genotype ii. What blood types are possible among the children of two parents with type O blood?
A and B only
A and O only
O only
Answer:
A and O only
Explanation:
because they are codominant
Autotrophic nutrition does NOT occur in
(A) moss
(B) zooplankton
(C) tomato plants
(D) blue-green algae
Answer:
(B) Zooplankton
Explanation:
Zooplankton are heterotropic plankton. They consume Phytoplankton which are autotrophic plankton.
Autotrophic mode of nutrition does not occur in zooplankton.
AUTOTROPHS:
Autotrophic mode of nutrition is a specific type of nutrition in which certain organisms synthesize their own food, hence, do not depend on other organisms. Organisms that perform autotrophy are called AUTOTROPHS. They include green plants, algae, lower plants like mosses etc. The two types of autotrophy are photosynthesis and chemosynthesis. Zooplankton is an animal-like protist and hence cannot undergo autotrophic mode of nutrition.Learn more at: https://brainly.com/question/21582881?referrer=searchResults
Two species a cactus and a Venus fly-trap, have a water intake system that’s similar in function but not in structure. What type of structure is this
Answer:Are there answer options?
Explanation:
Trait X is dominant to x. if you cross a homozygous dominant parent with a heterozygous parent , what is the chance that the offspring will express the recessive trait?
Answer:
50% chances
Explanation:
Here trait X is dominant to x, so alleles of homozygous dominant parent will be XX and alleles for heterozygous parent will be Xx.
When homozygous dominant parent will be crossed with heterozygous parent, the result will be XX, XX, Xx and Xx. There are total four offspring out them two offspring express the recessive trait.
Hence, there are 50% chances that the offspring will express the recessive trait.
In humans, XO individuals are females with Turner syndrome and XXY individuals are males with Klinefelter syndrome. Red green color blindness is caused by an X-linked recessive allele. Suppose a colorblind man and a normal woman with no family history of color blindness married and had a daughter who was colorblind and had Turner syndrome.
1. Which event could have given rise to this offspring?
A) Nondisjunction at meiosis II in the mother.
B) Nondisjunction at meiosis I in the father.
C) Nondisjunction at meiosis l in the mother.
D) Nondisjunction at meiosis II in the father.
E) Nondisjunction at either meiosis I or meiosis II in the mother.
Answer:
The correct answer is option E) "Nondisjunction at either meiosis I or meiosis II in the mother".
Explanation:
Nondisjunction is a phenomena at which chromosomes are not properly separated during anaphase. This can either happen at meiosis I or meiosis II during oogenesis. Nondisjunction would explain the XO chromosomic condition of the daughter with Turner syndrome as well as the X-linked recessive allele of the red green color blindness. Nondisjunction happened in the mother because the father could not inherited an X-linked condition.
Notch is a receptor protein displayed on the surface of certain cells in developing fruit fly embryos. Notch’s ligand is a membrane-bound protein called Delta that is displayed on the surface of adjacent cells. When Notch is activated by its ligand, the intracellular tail of the Notch protein becomes separated from the rest of the protein. This allows the intracellular tail to move to the cell’s nucleus and alter the expression of specific genes. Which of the following statements best explains Delta’s role in regulating cell communication through the Notch signaling pathway?
A) Delta transmits a chemical signal to all the cells of a developing embryo.
B) Delta allows the cells of a developing embryo to communicate without making direct contact.
C) Delta restricts cell communication to short distances within a developing embryo.
D) Delta determines which cells in a developing embryo express the gene that encodes the Notch protein.
Answer:
OPTION C- Delta restricts cell communication to short distances within a developing embryo
Explanation:
Notch is a receptor protein, which is displayed on the surface of certain cells. It is observed in the developing fruit fly embryos.
The correct answer is:
Option C. Delta restricts cell communication to short distances within a developing embryo
Delta-Notch signaling pathway in which notch is a receptor protein. Notch transduces the short-range signals by interacting with the ligands like Delta.
Delta restricts the short-range cell communication distances within a developing embryo of fruitflies.
Therefore, option C is correct.
To know more about Delta-Notch signaling, refer to the following link:
https://brainly.com/question/9639650
Which graduated cylinder would you use to measure exactly 15.0mL of water for an experiment?
Answer: i think it's a A 50-mL volumetric cylinder with 0.1-mL accuracy scale
Explanation:
what are the three parts of a DNA molecule
Answer:
A phosphate group, a sugar group, and one of four types of nitrogen bases
Explanation:
DNA is made of chemical building blocks called nucleotides. These building blocks are made of three parts: a phosphate group, a sugar group, and one of four types of nitrogen bases. To form a strand of DNA, nucleotides are linked into chains, with the phosphate and sugar groups alternating.
Which phrase describes types of freshwater wetlands? Select three options
Answer:
There are four types of freshwater wetlands, which include, peat bogs, swamps, ponds and marshes. Some examples of wetland type of swamp include, sink, vernal pool, floodplains, mire, pocosin, mangrove forest, and carr. The location, depth of water and season they determine the climate of freshwater biome.
Gene Expression word bank! Help please!!
Answer:
(isn't copied, my own work from my own assiangment)
Explanation:
Gene expression starts in the DNA, which is located in the nucleus of a cell, an enzyme called RNA polymerase copies the gene’s DNA and creates an RNA sequence into an RNA transcript that complements the copied DNA. Then the RNA sequence is modified through a protein that will be splicing the RNA strand, this protein is called the spliceosome. The spliceosome takes out introns and pieces together exon a to create a mature messenger RNA(mRNA). Once the mRNA is created, it will transport to the cytoplasm of the cell. Then the ribosome protein and ribosomal RNA’s will translate the mRNA into amino acids, each amino acid is brought to the ribosome by an RNA called transfer RNA(tRNA), then it is added to a growing polypeptide chain. Once the polypeptide is complete, the chain is folded and made into a three-dimensional working protein.
What’s the frontal lobes in the brain?
Answer:
the frontal lobe is part of the brain cerebral cortex. it's a pair. the paired lobes are known as the left and right frontal cortex. the frontal lobe is located near the front of the head, under the fronts skull bones and near the head.
Answer:
each of the paired lobes of the brain lying immediately behind the forehead, including areas concerned with behavior, learning, personality, and voluntary movement.
Explanation:
A bald man marries someone who is not bald but whose father was bald. What is the % chance of a child who will eventually be bald?
1/4 chance of a girl and
2/4 chance of boy with baldness all will be bald
1/4 chance of a girl and 1/4 chance of a boy of all the children
2/4 girls bald and 2/4 boys bald
Answer:
The girl.
Explanation:
The activity of an enzyme was examined in the laboratory as it catalyzed the formation of the product B, from the substrate A. This reaction was carried out in an aqueous solution consisting of water and copper sulfate at a pH of 7. While attempting to repeat the experiment, a biochemist uses a solution of pure distilled water (pH = 7) and observes that the rate of formation of B has decreased dramatically. Which is the most likely possible explanation for this result?A. The enzyme’s optimal activity is not at pH 7.B. Sulfate ions inhibit binding of A to the enzyme’s active site.C. The enzyme needs copper ions to act as cofactors for optimal enzyme activity.D. The enzyme needs the presence of a coenzyme to function.E. B is unstable and cannot be measured.
Answer:
The enzyme needs copper ions to act as cofactors for optimal enzyme activity.
Explanation:
(CM.05] In the United States, tornadoes generally occur because of the
freezing of ocean water
underwater earthquakes
meeting of cool and warm air masses
shifting of warm and cool ocean currents
Water filters down through the surface and enters groundwater or aquifers, by ________ A percolation B precipitation C condensation PLEASE HURRY IN A TEST!!!!!!!
Answer:
A. percolation
Explanation:
Calculate the membrane potential of a neuron at standard temperature under each of the following conditions:
a. The concentration of sodium, potassium and chloride is the same on both the inside and the outside of the membrane.
b. The concentration of ions inside and outside the cell are as given below, but the relative permeability is the same for the three ions.
c. The concentration of ions inside and outside the cell are as given below, but the relative permeability of K is 100 times greater than that of Na+ and Cl-.
[Na+]o=150mM; [Na+]i=15mM;
[K+]o=5mM; [k+]i=100mM;
[Cl−]o=150mM; [????????−]i=13mM;
Answer:
A. 0 mV
B. -11.5 mV
C. -68.8 mV
Explanation:
Check attachment below for explanation
What is the difference between meiosis I and meiosis II?
Select one:
a. Meiosis II results in four haploid cells instead of two diploid cells.
b. Meiosis I has a prophase stage, but meiosis II does not.
c. Nuclear membranes form during meiosis II but not meiosis I.
d. Cytokinesis occurs during meiosis II but not meiosis I.
Answer:
In meoisis I, homologous chromosomes separate while meiosis II, sister chromatids separate
The apple tree receives 1000kJ of light from the Sun, but only uses 500kJ. Of this, only 250kJ are stored in the tree to be transferred through the food chain.
a) Calculate the efficiency of the tree (2)
b) State the ways in which the remaining energy has been transferred out the of the food chain (3)
a) 250/1000 × 100 = 25%
b) Respiration, decomposition
pleaseeeeeee help help nowwww please
The human respiratory system intakes oxygen which is transported to all parts of the body by the circulatory system. Then, the circulatory system returns deoxygenated blood to the respiratory system.
At what level of organization does this interaction occur?
A.
organism
B.
organelle
C.
organ
D.
cell
Answer:
The answer is A. organism
Why is there a border between light and dark on the moon
Answer:
As the Moon orbits around the Earth, we are able to see more or less of the half that is illuminated. ... There is a border between light and dark on the moon because the sun illuminates the half of the moon that is facing it. Leaving the other half dark.
Explanation:
Hope this helps!
The moon is the earth's only natural satellite and it gets its light from the sun. The moon changes its phases from a new moon to a full moon.
The terminator is the dividing line that is found between the moon's lighter and darker sides. It is sometimes known as the twilight zone. It can be seen during the rising and setting of the sun. The line is there so as to indicate the difference between night and day. The sun can illuminate only that part that is facing it. As the moon also rotates around the earth only that side is visible.Hence the sunlight travels in a straight path and can't reach the other side.
Learn more about the there border between light and dark on the moon.
brainly.com/question/21644751.
plzzz need help going to faiel
Answer:
The answer is salt weathering
Explanation:
Answer:
B
Explanation:
Which statement correctly identifies structures 1 and 2 in the diagram?
Answer: structure 1 is an unstable atom structure 2 is a new atom
Explanation:
what is the kingsnakes closest relative
dog
stick insect
goldfish
Answer:
goldfish
Explanation:
There are many organism which shows some relative character with other organisms.
Kingsnakes and goldfish has some similarities that makes them closest relative. They both are cold blooded and have common phylum that is Chordata. They both are vertebrates and their spinal cord is enclosed and protected by series of bones.
some species of kingsnakes such as Mexican milk snake and red milk snake and goldfish have posses coloration and patterning which protect them from invasion of other organisms. They both have scales in their body, though the scales are not homologous.
Hence, the correct option is goldfish.
Earthquakes can occur along
___________ lines at __________
boundarie
Answer:
Earthquakes can occur along fault lines. The second part is on the tip of my tongue but can't remember it.
Explanation:
Answer:
Fault lines, plate bounderies?
Explanation:
i believe it is-
Earthquakes can occur along Fault Lines at Plate boundaries