1. Define communicable diseases. Give three examples.
2. Give two examples of each of the following types of microorganisms: a) Algae b) Fungi c) Protozoa.
3. What is pasteurization?
4. Mention any three ways through which pathogens are transmitted.
5. It is always suggested that not to eat anything from street hawkers. Why?
6. Ria thought of making curd. For this, she took lukewarm milk, mixed some curd into it and stir well. She kept the mixture in fridge. Next day she observed that curd was not set. Can you tell why the curd did not set?
7. Seema got cough and cold badly. Her teacher asked her to take rest at home and use handkerchief while sneezing and coughing. She obeyed her teacher.
a) Why should we keep a handkerchief on nose and mouth while sneezing or coughing?
b) What are the modes of transfer of diseases from infected to healthy person?
c) Do you think Seema’s teacher’s decision was right? Why?
d) What value of Seema is shown here?
8. Classify bacteria on the basis of their shapes.
9. Why are viruses considered to be the borderline between living and the non- living?
Answer:
1-Those diseases which can be transferred from one person to another person are called communicable diseases . Examples-Common cold ,HIV,chicken pox
2-Algae- spirogyra,volvox
fungi-yeast,mushroom
protozoa-plasmodium,amoeba
3-pasteurization, heat-treatment process that destroys pathogenic microorganisms in certain foods and beverages.
3.Charles Darwin noted that the finches on the Galapagos islands looked different from the mainland finches, even though all the finches on the islands had originally
migrated from the mainland of South America. This is an example of.
temporal isolation
O mechanical isolation
adaptive radiation
hybrid breakdown
Charles Darwin's finding that the finches on the Galapagos islands looked different from the mainland finches despite their common ancestry from South America is an example of C. adaptive radiation.
What is common ancestry?Common ancestry refers to blood relationships. Thus, two species may have common ancestry if they are related by blood.
According to Charles Darwin, common ancestry explains the similarities between different species.
However, a rapid increase in the number of species with a common ancestor, characterized by great ecological and morphological diversity results from adaptive radiation.
Thus, Charles Darwin's finding that the finches on the Galapagos islands looked different from the mainland finches despite their common ancestry from South America is an example of C. adaptive radiation.
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RNA is synthesized on a DNA template in a process called ______, which utilizes the enzyme _______.
Answer:
transcription whic uses transcriptase enzyme
Explanation:
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Peptic ulcers are caused by damage to the wall of the stomach by the acids that help digest food.
This can be caused by the failure of
A. tight junctions
B. adhering junctions
C. gap junctions
D. plasmodesmata
E. adhering and gap junctions
Peptic ulcer disease can be caused by the failure of tight junctions. Thus, the correct option is A.
What is Peptic ulcer disease?Peptic ulcer disease may be defined as a circumstance in which bitter and painful sores or ulcers evolve in the lining of the stomach or the first part of the small intestine which is the duodenum.
A tight junction is responsible for lining the wall of the intestine or stomach. It helps in the prevention of the passage of digestive enzymes through the space between adjacent locations inside the stomach or small intestine.
If this junction breaches, it results in damage to the wall of the stomach by the acids that help digest food and causes the peptic ulcer disease which is infected by a bacterial organism known as Helicobacter pyroli.
Therefore, it is well described above.
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Scale insects can be serious pests for citrus fruits. Severe infestations of scales result in falling twigs and branches until the affected tree dies. In the early 1900s, California citrus growers sprayed their trees with cyanide gas to kill scale insects. By 1914, some scale insects were surviving the spraying, and eventually the whole population showed resistance to cyanide. Which of the following statements best explains how resistance to cyanide spread in the scale insect population?
A. Insects with a resistance gene survived the first cyanide sprayings and passed the gene to their offspring.
B. Parasites infecting the insect population carried the trait from insects with a resistance gene to insects without a resistance gene.
C. Predators put greater selection pressure on insects with a resistance gene than on insects without a resistance gene.
D. Insects without a resistance gene underwent mutation upon contact with the cyanide to acquire resistance.
Individuals exposed to a damaging factor might mutate and resist the nosive effects. D) Insects without a resistance gene underwent mutation upon contact with the cyanide to acquire resistance.
What is resistance?The term resistance refers to an inheritable change in the population sensitivity, reflected through the exposure of individuals to damaging factors (insecticides, for instance) that affects the population.
A genetic modification -mutation- might occur in some of the exposed individuals, leading them to survive under the effects of these factors.
Mutated individuals spread this new character in the population, which evolves with the capability of tolerating the element that would normally affect it.
In the exposed example, some of the exposed individuals developed a mutation after the cyanide exposure and got to survive. These individuals could mate and reproduce, transmitting this new resistant character to the following generations.
The correct option is D. Insects without a resistance gene underwent mutation upon contact with the cyanide to acquire resistance
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What organelles of a cell is responsible for sensitivity?
Explanation:
Mitochondria are the organelle where ATP is generated through oxidative phosphorylation and several diseases are associated with mitochondrial dysfunction and oxidative stress. Mitochondria contain their own DNA and their number within the cell is finely regulated
Which statement about vacuoles is true?
Only plant cells contain vacuoles.
Only animal cells contain vacuoles.
Vacuoles are larger in plant cells than in animal cells.
Vacuoles are larger in animal cells than in plant cells.
Explanation:
Vacuoles are larger in plant cells than in animal cells.
a carbohydrate 7 monomers long has how many glycosidic bonds?
A. 1
B. 2
C. 3
D. 4
E. 7
Answer:
b. 2 is the answer to ur question
the picture has the question in it
The sequence of passage of air during inhalation:
pharynx
larynx
trachea
bronchi
alveoli
(there are actually a few more steps to this question, but these are what the question lists)
hope this helps!!
HELP PLS FOR BRAINLIEST AND THANKS
see attached image
Answer:
none of the other answer
Explanation:
because the chance of CF in child depends in having disease both father and mother if one of them have the disease then its maybe 1 in 1000 or more
Answer:
your answer is correct 1/4
Explanation:
since both parents are heterogeneous so the percentage that their new child will have this disease is 1/4 and this disease needs two alleles of cftr since it is recessive
5
As you know, usually
agree) with the things you're saying now
This time last year
the city centre
I was so tired last night that
television.
4
I missed my bus to school yesterday, and by the time
(lesson /start).
(Tim/visit) me next Sunday, and
2
3
Grammar and vocabulary
A Complete the sentences with the correct form of the words in brackets
Example:
We study (we/study) English every day, but today we're doing (we/do) a progress test
1
cinema.
(1/agree) with everything you say, but
(1/work) in a shop and
(1/fall) asleep while
(1/not
(live) in a small flat in
(1/watch)
(1/arrive), my
(we/probably/go) to the
Answer:
chapter five Global Affairs Module concepts
When telephoning patients who have not returned to the office for normal maintenance and recall appointments, several of the patients remark that the office has changed and that it isn’t as nice as it used to be. The dentist instructs the dental assistant to create a list of improvements that would enhance the dental office setting. What aspects and areas of the dental office should be assessed, and what factors should be considered when making changes to the dental office? Using LIRN.net research the different office set up for Specialty practices. Be sure to site your source. https://www.lirn.net/
The aspect and areas of the dental office that should be assessed is the customer service units. The patient- dental assistant relationship should be enhanced.
Who is a dentist?A dentist is an individual that specialises in diagnosis, treatment and prevention of diseases that is associated with the gum, teeth and mouth.
When creating a list of improvement that would enhance the dental office setting, the customer service unit should be assessed. This is because it is the point where the patient and the dental assistant has first point of contact.
The manner of approach of the dental assistance to these patients needs to be improved as patients who are not well received can stop coming to the clinic.
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Atoms of which three elements could bond together to form an organic compound?
Ooxygen, iron, and carbon
O carbon, hydrogen, and oxygen
O oxygen, hydrogen, and nitrogen
O carbon, iron, and nitrogen
Answer:
carbon, hydrogen, and oxygen (second option listed)
Question 6 of 10
Which is an example of how ecosystems on Earth affect each other?
1) Worms reproduce in soil in grassland ecosystems.
2) Deforestation of rain forests harms other ecosystems.
3) Lions get energy from the primary consumers they hunt.
What is a mixture of viral and T cell DNA that is capable of replication?
provirus
viral DNA
AIDS virus
viral RNA
Answer:
provirus
Explanation:
it is the only virus that have the mixture of t cell DNA
Answer:
Provirus
Explanation:
The double-stranded viral DNA joins the T cell DNA in a process called integration.
Why are mosses called pioneer plants?
Answer:
The first organisms to appear in areas of primary succession are often mosses or lichens. These organisms are known as pioneer species because they are the first species present; pioneer species must be hardy and strong, just like human pioneers.
Explanation:
In DNA replication, continuously synthesis occurs on the leading strand
Answer:
I think the answer is A. toward the origin of replication.
Explanation:
I hope this helps! Correct me if I am wrong.
In DNA replication, continuous synthesis occurs on the leading strand toward the origin of replication. Therefore option A is correct.
In DNA replication, continuous synthesis occurs on the leading strand, which is the template strand that runs in the 3' to 5' direction.
DNA polymerase synthesizes the leading strand in the 5' to 3' direction, moving toward the replication fork's origin. The replication fork is the point where the DNA strands are unwound and replication begins.
As the replication fork opens, DNA polymerase adds nucleotides in the direction of the origin of replication, continuously elongating the leading strand.
The lagging strand, on the other hand, is synthesized discontinuously in the opposite direction, creating Okazaki fragments, which are later joined together by DNA ligase.
Therefore option A is correct.
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Your question is incomplete, but most probably your full question was,
In DNA replication, continuously synthesis occurs on the leading strand Multiple choice question.
A. toward the origin of replication.
B. without RNA primers.
C. In the 5' to 3' direction.
D. Creates Okazaki fragments.
PLEASE HELP
How is nitrogen gas fixed biologically?
A) combustion of fossil fuels
B) respiration of living organisms
C) bacteria in plant roots and soil
D) decomposition of organic matter
How would a system of naming help Darwin create a unifying theory of evolution?
Explain How sunlight is the primary source of energy for you life
Which of the following is composed of a population of a species plus populations of other species?
A. Biotic Potential
B. Abiotic community
C. Community
D. Ecosystem
Reset Selection
Answer: D ecosystem
A man with type AB blood has children with a woman who has type O blood. What are
the chances that a child they conceive will have type A blood? B? AB? O?
Please answer for brainliest and thanks!!
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This couple could have children of either blood type A (O from mother and A from father) or blood type B (O from mother and B from father).Which of these best explains how solid waste can harm wildlife?
A. Aquatic animals drown after getting tangled in fishing line.
B. Bacteria are introduced to break down hydrocarbons in an oil spill.
C. The mercury contained in fish builds up in animals that eat the fish.
D. An increased growth in microorganisms results in oxygen depletion.
Solid waste can harm wildlife by the mercury contained in fish builds up in animals that eat the fish. That is option C.
What is effects of solid wastes?Solid wastes are those materials that are discarded from factories and facilities which may contain chemicals that are able to pollute the water bodies.
When they are being washed into the water body, they build up in the body of fishes in a process called bio magnification.
Bio magnification is a process whereby chemicals that are washed into the water bodies accumulate on the body of animals (wildlife) through eating of aquatic animals.
When animals feed on these fishes, it harms their health with time.
Therefore, Solid waste can harm wildlife by the mercury contained in fish builds up in animals that eat the fish.
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Which indicates how evidence of climate change supports the theory of continental drift?
O coal fields in several continents
O volcano formation
O glacial evidence found in South Africa
O folded mountains in Africa and South America
Glacial evidence discovered in South America demonstrates how climate change evidence has bolstered the notion of continental drift. Folded mountains in Africa and South America. Thus, the correct option is D.
Climate change is happening all across the planet on a daily basis. This is primarily due to human activities that have had an impact on the atmosphere and the earth.
What is continental drift?Continental drift is basically the hypothesis that the continents once constituted a single landmass, disintegrated, and drifted to their current places.
The discovery of glacial evidence in South America has led to a greater acceptance of the continental drift idea.
Finally, we can conclude that glacial evidence discovered in South America demonstrates how climatic change evidence supports the hypothesis of continental drift.
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Answer:
option d is the correct awnser
Explanation:
O folded mountains in Africa and South America
Use the codon table below to analyze a segment of mRNA with the base sequence
GGU AGC CGG.
A. Gly-Ser-Arg
B. Val-Thr-Ala
C. Pro-Ser-Ala
D. Glu-Thr-Arg
Which amino acid chain will these codons form?
The mRNA sequence GGU AGC CGG encodes the amino acid sequence Gly-Ser-Arg (Option A).
What is the genetic code?The genetic code makes reference to the linear order of DNA/RNA nucleotides in codons that specify different amino acids.
The genetic code starts in DNA to be transcribed to mRNA and finally translated into protein sequences.
In conclusion, the mRNA sequence GGU AGC CGG encodes the amino acid sequence Gly-Ser-Arg (Option A).
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In experiments intended to measure conformity it was found that
In experiments designed to measure compliance, observed participants were found to tend to obey authorities, even if their orders contradict individual common sense.
What does the Milgram experiment say?The Milgram Experiment (or Milgram Experiment) was a scientific experiment developed by psychologist Stanley Milgram. The experiment aimed to answer the question of how observed participants tend to obey authorities, even if their orders contradict individual common sense.
With this information, we can conclude that Milgram wanted to investigate what circumstances led men to commit barbarism and observe how far they would be able to go if there was a superior responsible for their actions or if he gave them instructions to violate integrity and infer pain to the other.
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How does the melting of icecaps affect climate change
Answer: it can contribute to rising sea levels, higher overall climate, & affect native wildlife.
Explanation: (1) Melting ice can add more water to the ocean, which in turn sea levels rise due to this affecting coastal communities. (2) sea ice such as snow caps reflect 50 percent of solar radiation, (thick sea ice covered with snow reflects even more radiation, about 90 percent) this reflecting keeps global temperatures in check. (3) native arctic wildlife, such as porpoises, fish, avians, and land-mammals are affected as their homes are shrinking, leading to less food and areas that they are adapted too.
How does plant with particulate matter affect the economy
Answer:
By the roots under the so I creating a stabilized climb
Plants counteract the greenhouse effect by removing___________ during
photosynthesis.
A. oxygen
B. carbon dioxide
C. glucose
Answer:
B
Explanation:
The green house effect is a phenomenon resulting from the release of air pollutant gases including carbon dioxide.
photosynthesis works by absorbing carbon dioxide gas and water as raw materials for energy & glucose production.
therefore one can conclude that by removing one of the green house gases (pollutants) we can counteract (go against) it.
What is the molarity of a 17 ml solution used to prepare 65 ml of 2.4 M
solution?
Answer:
goo khao eat some stool hahaha
