Answer:
True
Explanation:
The cells in a middle layer of leaf tissue called the mesophyll are the primary site of photosynthesis. Small pores called stomata—singular, stoma—are found on the surface of leaves in most plants, and they let carbon dioxide diffuse into the mesophyll layer and oxygen diffuse out.
With increasing maternal age, the chances of observing trisomies increase significantly. Increasing paternal age is associated with de novo point mutations. Why?
Answer:
Mother: higher risk of an improper chromosome division
Father: higher risk to suffer point mutations in sperm cells
Explanation:
A trisomy is an alteration in the chromosome number (i.e., an aneuploidy), and occurs when a cell receives three chromosomes instead of two. The risk of aneuploidies -including trisomies- increases with the mother's age due to the fact that older eggs have a higher chance of dividing unequally, thereby leading to an imbalanced number of chromosomes between daughter cells. Moreover, a point mutation is defined as a genetic modification where a single nucleotide is changed in the DNA sequence. It has been shown that point mutations in children are determined to a large extent by the father’s age, which are due to mutations in germline cells (i.e., sperm cells) that were passed to the progeny. A child born from a father who is 20 years old exhibits on average 40 point mutations, whereas a child born from a father who is 40 years old has typically twice the point mutations on its genome.
The part of the cell that is like your brain and gives instructions to the cell is
A.nucleus
B.protoplasm
C.membrane
D.fat cells
Help please
Based on the data in the graph, how are cyanobacteria responsible for the rise in atmospheric oxygen? State your claim, then make sure to use evidence from biological processes and data from the graph to support your claim.
Answer:
They perform photosynthesis, releasing oxygen into the atmosphere as a by-product.
Explanation:
Around the time that cyanobacteria appear around 3.2 billion years ago, the oxygen levels rise sharply.
Cyanobacteria are photosynthetic organisms. They possess the photosynthetic pigment chlorophyll, meaning they can trap light energy and use it to power chemical reactions to synthesise glucose. They convert carbon dioxide and water into sugar, releasing oxygen into the atmosphere as a byproduct. This causes oxygen levels to rise.
Answer:
Cyanobacteria are microbes that live primarily in seawater. They are believed to have been the first organisms on Earth to perform oxygenic photosynthesis. In this process, they produce organic carbon, the building blocks of life's molecules, and release oxygen gas (O2).As oxygen photosynthesis starts,that's when the first O2 producing of cyanobacteria occurs.The graph reaches a peak at Cambrian explosion.
The two main zones within the A climate are
Answer:
The Earth has three main climate zones: tropical, temperate, and polar. The climate region near the equator with warm air masses is known as tropical. In the tropical zone, the average temperature in the coldest month is 18 °C.
The climate has three main zones such as tropical, temperate, and polar.
What are Earth's climatic zone?
A climate zone refers to a condition by observing different factors like temperature, humidity, precipitation, season and natural vegetation of an area.
Earth's climate zones is surrounded by the horizontal belts of different climates such as tropical, dry, temperate, continental, and polar zones.
Firstly, Tropical climate zones which present near the Equator of earth and have high temperatures and high precipitation, while Dry or arid climate zones shows high temperatures and little annual precipitation.
Similarly temperate climate zone observed Earth’s middle latitudes and shows wider temperature and seasonal variations are more distinct.
Continental climate zone observed in mid-latitudes, shows swing of temperatures from cold in winter to warmer, where as polar climate zones shows harsh climate which cannot to support vegetation.
Hence, major zones are tropical, temperate, and polar.
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Fill in the blank with the appropriate directional term to complete the following sentences as if a body is in anatomical position. More than one answer may be correct. Use terms from the previous slide.
The heart is to the lungs.
The knee is to the hip
The wrist is to the hand
The mouth is to the nose.
The thorax is to the abdomen
The thumb is to the ring finger
The sternum is to the heart
The skull is to the scalp
The ears are to the nose
Dorsal refers to the of the human body, while ventral refers to the of the human body
WORDS:
.
Deep Front Anterior Proximal Superficial Posterior Inferior Superior Distal Back Medial
Explanation:
Dorsal is posterior(back). Ventral is anterior(Front)
When would you expect the smallest change between high and low tides?
Answer:
During a neap tide.
Explanation:
Neap tides are when the tidal movement is affected in the least magnitude by the moon.. This happens just after the moon is in its first and third quarter. So roughly every fornight
Dichotomous key example
Circle the word that best completes the statement about cell theory.
6. The cell theory states that:
i. All organisms are made of organelles / cells.
ii. All existing cells are produced by other living dead cells.
111. The atom cell is the most basic unit of life.
7. Cell theory is one of the great unifying theories of biology / chemistry.
MAIN IDEA: Prokaryotic cells lack a nucleus and most internal structures of
eukaryotic cells.
Question reformatted:
Circle the word that best completes the statement about cell theory.
6. The cell theory states that:
i. All organisms are made of organelles / cells.
ii. All existing cells are produced by other living / dead cells.
iii. The atom / cell is the most basic unit of life.
7. Cell theory is one of the great unifying theories of biology / chemistry
Answer:
6. The cell theory states that:
i. All organisms are made of cells.
ii. All existing cells are produced by other living cells.
iii. The cell is the most basic unit of life.
7. Cell theory is one of the great unifying theories of biology
Explanation:
Cell theory is one of the central theories of biology and is universally accepted. It states that all organisms are cellular - that is they are made of cells. It also states that all living things come from other living cells (not spontaneously, or from dead cells). The cell is the most basic unit of life, organisms can be unicellular, but no living thing is 'less' than that.
What is a scientific theory? Make up your own scientific theory.
Answer:
A scientific theory is a well-substantiated explanation of some aspect of the natural world, based on a body of facts that have been repeatedly confirmed through observation and experiment. Such fact-supported theories are not guesses, but reliable accounts of the real world.
Explanation:
I hope this helps :)
Annie is herding cattle when one of them gets spooked. What is the likely reaction of the herd? A they will all become agitated B they will not react to a single cow C they will follow the direction of the handler D they will try to protect the spooked cow
Answer:
A
Explanation:
Answer:
the answer is D, they will all become agitated
Explanation:
i got it wrong and it showed the correct answer
For which swimming stroke is diving not recommended to start a race?
Answer:
Backstroke
Explanation:
For backstroke, you have to lay on your back. When I was on a swimming team, we'd always go on the diving blocks for all strokes except for backstroke.
Backstroke is the swimming stroke in diving that is not recommended to start a race
There are different types of swimming strokes such as
Butterfly Backstroke BreaststrokeFreestyleThe backstroke involves the use of the back on water for movement. This
stroke has a main advantage which is the ability of the swimmer to breathe
well in water as his nose aren't always submerged in it.
The backstroke isn't however recommended to start a race as there is the
issue of the inability to see where he/she has to dive into the water or swim
through. Other swimming strokes are however recommended for starting a race.
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how do eumelanin and pheomelanin affect our skin color?
Answer:
There are two types of melanin--eumelanin and pheomelanin. In general, the more eumelanin in your skin, the darker your skin will be. People who make more pheomelanin than eumelanin tend to have lighter skin with freckles. Like many other traits, the amount and kind of pigment in your skin is controlled by genes
Explanation:
consider the endosymbiont theory and the fact that chloroplasts contain dna molecules. given that chloroplast DNA has genes,
Answer/Explanation:
The endosymbiotic theory is the idea that eukaryotic cells evolved from the fusion of two prokaryotic cells that formed a symbiotic relationship, with one living inside the other.
An endosymbiont is one organism that lives inside another one.
The existence of mitochondria and chloroplasts, which contain their own DNA and ribosomes, supports this theory. Mitochondria are chloroplasts were once free-living organisms, they were prokaryotes that ended up inside of other cells.
Mitochondria and chloroplasts have genes that are very similar to the genes of prokaryotes. Their membranes look like the prokaryotic cell membrane, and they divide in similar ways.
Which letter marks the zone of inhibition?
Answer:
A. B
Explanation:
"B" as labelled in the above is the zone of inhibition.
The Zone of Inhibition is actually a test which is used to assess antimicrobial activities of a material or solution in relation to an micro-organism as a target. It is also known as Kirby-Bauer Test. It measures the antibiotic resistance and also used to inhibit microbial growth.
At the Point B, microbes can not grow in there; they are inhibited.
In the test, if bacterial strain or any other strain is susceptible to the antimicrobial agent, a zone of inhibition appears. If it shows resistance to that agent, then no zone is evidential.
how do mutations affect our communications?
Explanation:
When a mutation alters a protein that plays a critical role in the body, it can disrupt normal development or cause a medical condition. A condition caused by mutations in one or more genes is called a genetic disorder. In some cases, gene mutations are so severe that they prevent an embryo from surviving until birth.Over time, a mutation might take place in one of the descendant cells, causing increased activity of a positive cell cycle regulator. The mutation might not cause cancer by itself either, but the offspring of this cell would divide even faster, creating a larger pool of cells in which a third mutation could take place.
Although Natasha is a brilliant pianist snd highly acclaimed ballet dancer, her high school intelligence test scores were only average. What does Natasha’s experience suggest regarding the nature of intelligence
Answer:
It suggests she have bodily-kinesthetic intelligence according to Howard Gardener's theory of multiple intelligences.
Explanation:
Howard Gardener's theory of multiple intelligences suggests that there are eight different types of intelligence instead of a single generalized one. Bodily-kinesthetic intelligence is one of them that is the ability to skilfullly use the body or its parts.
Natasha's experience tells that she may be high on this specific kind of intelligence as athletes like her and dancers like her are high on bodily-kinesthetic intelligence.
A student is testing a silver colored rock sample with the lab equipment shown in the
diagram above. The silver colored rock completes the circuit and lights the bulb.
The student concludes the sample could be which of the following?
I. metal
II. metalloid
III. nonmetal
What organelles produce spindle fibres. What will these spindle fibres eventually be used for?
Answer:
Centrosome
Explanation:
Spindle fibres pull the chromosomes apart.
Answer:
The organelle that produce spindle fibers are centrosome,
The main function of the spindle fibers is to pull the chromosomes apart.
Fluids fill in the spaces between the particles of sediment and
crystallize to create a rock by
a Clastic
b Compaction
C Crystallization
d Cementation
Answer:
D- Cementation
Explanation:
Cementation, in geology, hardening and welding of clastic sediments (those formed from preexisting rock fragments) by the precipitation of mineral matter in the pore spaces. It is the last stage in the formation of a sedimentary rock.
Hope this helps!
Which statement best describes the initial process of N-linked glycosylation in the endoplasmic reticulum
Answer:
The oligosaccharide is assembled on the lipid carrier at the membrane of the ER
Explanation:
N-linked glycosylation consists of the attachment of an oligosaccharide (glycan) to a nitrogen atom of the asparagine (Asn) residue in the protein. N-linked glycosylation is a key posttranslational modification (PTM) capable of controlling protein structure and function, this pathway takes place in the plasma membrane in archaea organisms and in the membranes of the endoplasmic reticulum (ER) in eukaryotic organisms. In eukaryotic cells, the N-linked glycosylation conserved pathway consists of two steps. In the first place, the oligosaccharides are assembled on a lipid carrier called dolichyl pyrophosphate localized in the endoplasmic reticulum (ER). The dolichyl-phosphatase is a hydrolase enzyme that acts on phosphoric monoester bonds. Second, the oligosaccharides are modified by specific glycosyltransferases that transfer these molecules to selected Asparagine (Asn) acceptor residues of polypeptide chains that have entered the lumen of the ER. These N-glycans are firstly assembled as a dolichol-linked precursor oligosaccharide at the cytoplasmic face of the ER.
Why don’t you get the flu when you get a flu shot?
A. You wash your hands to keep from getting the flu
B. Your body makes antibodies to keep flu away
C. Your body makes a pathogen to fight the flu
D. Your body makes a natural immunity for the flu
Which of the following is a slow process that changes earths surface (flooding), (earthquake), (wind erosion), (volcanic erosion)
Answer:
i'm pretty sure it's earthquake.
Explanation:
Answer:
flooding because of water erosion.
Hope this helps!!!Different energy sources provide different benefits to individuals and the environment. What are some nonpolluting sources of energy? a. coal, oil, and natural gas. c. alcohol and acetylene. b. nuclear energy. d. wind, solar, and hydroelectric power.
Answer:
Its D
Explanation:
Because they cause no harm to the environment and they are very safe to the environment.
Answer:
D
Explanation:
I took the test on edge
Both strands of the DNA double helix contain nitrogenous bases held together by hydrogen bonds. In DNA, the sequence of nitrogenous bases varies widely. What is the significance of the nitrogenous bases?
A. They determine the amino acids in the proteins synthesized.
B. They prevent mutations from occurring in the process of DNA replication
C. They help complete the sugar-phosphate backbone of DNA molecules.
D. The amount of adenine and cytosine determines the length of the gene on a DNA molecule.
Answer:
A
Explanation:
Essentially, in the process of protein synthesis, there is first transcription where mRNA is synthesized off of a DNA strand with complementary nitrogenous bases. After processing occurs (in basic terms the mRNA is literally processed) and the mRNA strand leaves the nucleus, it attaches to a large and small ribosomal subunit (a ribosome) where translation occurs. The gist of it is when the mRNA strand is being read by the ribosome. tRNA will come over and bind temporarily bringing with it a specific amino acid, starting the formation of the polypeptide/amino acid chain. Nitrogenous bases play into this as the sequence of the nitrogenous bases is what determines what tRNA will bind onto it which determines which amino acid is brought. More specifically, this deals with the codons of the mRNA and the corresponding anticodons with the tRNA, which is a bit of a more specific topic.
The nitrogenous bases help complete the sugar-phosphate backbone of DNA molecules. The correct option is C.
What is DNA?DNA, also renowned as deoxyribonucleic acid, is a complex molecule that includes all of the information required to construct and retain a lifeform.
DNA is found in the cells of all living things. In real sense, as in almost every cell in a multicellular organism contains the entirety of the organism's DNA.
DNA is composed of chemical key components known as nucleotides. These building blocks are composed of three components: a phosphate group, a sugar group, and one of four different types of nitrogen bases.
Nucleotides are linked together in chains, with the phosphate and sugar groups alternating.
Thus, the correct option is C.
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A patient comes into the hospital complaining of having symptoms that looks like to be a streptococcal infection. When treated at the hospital it was determined the patient has streptococcus. However, after 3 days of being in the hospital the patient is now showing symptoms of having pneumonia. How is this possible? How did this pattern of infection take place? Talk about the immune system and the reasoning behind these diseases.
Answer:
Hope it helps...
Explanation:
Pneumococcal disease is caused by bacteria called Streptococcus pneumoniae (pneumococcus). People with pneumococcal disease can spread the bacteria to others when they cough or sneeze. Symptoms of pneumococcal infection depend on the part of the body affected.
1.Gravity is
found only between the earth and the moon
not found in space, but is only found on earth
a pulling force that exists between all objects in the universe
a force that pushes objects away
2.Which statement is true about a planet’s orbital motion?
Orbital motion results when the object’s forward motion is balanced by a second object’s gravitational pull.
Orbital motion is limited to the moons of the planets and the planets in our solar system.
Orbital motion cannot be achieved with man-made objects.
Orbital motion only occurs when forward motion exceeds the gravitational pull.
3.How does distance affect the gravitational force?
The gravitational force decreases as distance increases.
The gravitational force is not changed by distance.
The gravitational force changes unpredictably with distance.
The gravitational force increases as distance increases.
4.As mass increases, the gravitational force
changes unpredictably
decreases
stays the same
increases
Answer:
The moon's gravitational pull on the Earth is the main cause of the rise and fall of ocean tides. The moon's gravitational pull causes two bulges of water on the Earth's oceans—one where ocean waters face the moon and the pull is strongest and one where ocean waters face away from the moon and the pull is weakest.
Explanation:
Niagara Falls is a big waterfall on the border of Canada and the United States. Each year the edge of the waterfall moves back a couple of centimeters because the water is breaking apart the rocks on the edge. What is this an example of? Why?
Write any 2 control measures of Virus.
Answer:
Personal hygiene, environmental hygiene
Explanation:
Always take care of the body to be clean often to avoid the rate of virus sticking on and in the body through diffusion, and often clean the environment to reduce the spread of virus
Golden rice is a genetically modified organism that has high vitamin A content. What is golden rice
attempting to do?
A. grow rice in salty soil
B. create better looking rice
c.grow rice under drought conditions
D.create rice that contains more nutrients
Answer:
Golden rice is a genetically modified, biofortified crop. Golden rice is genetically modified in order to produce beta carotene, which is not normally produced in rice. Beta carotene is convereted into Vitamin A when metabolized by the human body. We need Vitamin A for healthier skin, immune systems, and vision.
Explanation:
Which of the following bio molecule groups is described by the roles and functions listed above
Answer:
Explanation:
Some of the important functional groups in biological molecules are shown above: hydroxyl, methyl, carbonyl, carboxyl, amino, phosphate, and sulfhydryl (not shown). These groups play an important role in the formation of molecules like DNA, proteins, carbohydrates, and lipids.