Answer:
Census
Explanation:
A census is a study that obtains data from every member of a population. In most studies, a census is not practical, because of the cost and/or time required.
Hope this helps!!!
An acid-fast staining method was performed on a bacterial smear using the dyes carbol fuchsin and methylene blue. The resulting stained slide contained only cells that appeared blue when visualized using a microscope. Which of the following could explain why only blue cells were present?
a. No acid-fast bacteria are present on the slide
b. Methylene blue was not used
c. Carbolfuchsin was not used
d. Acid-alcohol was not used
Answer: Only blue cells where present because No acid-fast bacteria are present on the slide. The correct option is A.
Explanation:
Acid fast staining method also called Ziehl-Neelsen (Zn) technique is used in the laboratory to stain samples suspected to contain Mycobacterium species. The Mycobacterium species which includes the M. tuberculosis, M. ulcerans, and M. leprae, do not stain well by the Gram technique, which is a common routine stain in the laboratory. This is because of waxy coating on its cell surface primarily due to the presence of mycolic acid.
The acid fast stain consists of:
--> A primary dye which is the carbol
fuchsin
--> A decolorizer which is the acid alcohol
--> A counter stain which is the methylene blue.
In it mechanism of action on the bacterial smear, when the primary dye is applied,the whole cell will appear red. But after decolorizing with acid alcohol, only acid fast bacteria will retain the red colour of carbol
fuchsin while the red dye from the background cells are removed. Then the counterstain (methylene blue) is applied which is picked up by non-acid-fast bacteria making the cells appear blue under the microscope.
Therefore when the bacteria smear is viewed under the microscope and only blue cells are seen, it means No acid-fast bacteria are present on the slide.
4.5.1 Practice: Evolution and Classification
Answer:
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Explanation:
Answer:
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Delte spaces
I need help with this thank you
Answer:
A).
Explanation:
Universe > Galaxy > Solar Sytem > Earth
2. Name one positive benefit of having vertebrae for Chordates
Question 2 (1 point)
Which two vocabulary words are synonyms (meaning similar things)?
a
revolution
b
orbit
c
latitude
rotation
Answer:orbit and rotation
Explanation:
If the base sequence of a strand of DNA is ATGGGCCTA, what would be the base sequence of the complimentary DNA strand?
Answer:
TACCCGGAT
Explanation:
Adenine(A) always base pairs with Thymine(T) (except in the case of RNA, in which case A would base pair Uracil(U).
Cytosine(C) always base pairs with Guanine(G).
What is the primary source of energy for all food chains?
Answer:
sunn
Explanation:
this is my alt acc
Explain the differences between Bacteria and Decomposers?
Answer: Decomposers like bacteria and fungi don't eat their food, they decompose it externally. Also, decomposers consume nutrients on a molecular level while detritivores eat large amount of decaying material and excrete nutrients. ... In addition to fungi, bacteria are also decomposer organisms. brainliest
Explanation:
explain why the concentration of FSH in the blood increases after day 1
Answer:
As the levels of FSH and LH in the blood increase with puberty, the eggs begin to mature and a collection of fluid — the follicle — begins to develop around each one. The first day of menses is identified as cycle day one. Estrogen is at a low point. ... This increase in estrogen begins to inhibit the secretion of FSH.
Explanation:
Laying eggs belong to which category of energy use? Maintenance, waste production, movement, growth and reproduction
Answer: it is reproduction
Explanation:
What type of plate boundary iS shown in the diagram?
O A. Subduction boundary
O B. Convergent boundary
• C. Divergent boundary
O D. Transform boundary
Answer:
I believe it is C. Divergent boundary
Answer:
C
Explanation:
7 reasons plants are important to the environment
Answer: The House of the Scorpion
Explanation: the first sentence fight for this
What can be concluded from the graph?
The layers of Earth have different densities.
O P and S waves are absorbed in the core.
The layers of Earth do not have distinct boundaries.
O Pand S waves always originate in the mantle and travel through the core.
Answer:
Explanation: second option
What is not a cause of wind?
Answer:
can u explain it more I might know the answer
Napollion Crossing The Alps
Answer:
Napoleon Crossing the Alps (also known as Napoleon at the Saint-Bernard Pass or Bonaparte Crossing the Alps; listed as Le Premier Consul franchissant les Alpes au col du Grand Saint-Bernard) is a series of five oil on canvas equestrian portraits of Napoleon Bonaparte painted by the French artist Jacques-Louis David ...
Explanation:
please give me brainlist and follow
What cell parts are common to all of these cells?
Use complete sentences.
Chlamydomonas
Spirogyra
Elodea
Squamous Epithelium
Answer: All cells share four common components: (1) a plasma membrane, an outer covering that separates the cell's interior from its surrounding environment; (2) cytoplasm, consisting of a jelly-like region within the cell in which other cellular components are found; (3) DNA, the genetic material of the cell; and (4). The cells of most Chlamydomonas species are more or less oval and feature a noncellulosic membrane (theca), a stigma (eyespot), and a usually cup-shaped chloroplast. Although photosynthesis occurs, nutrients also may be absorbed through the cell surface. Asexual reproduction is by zoospores. The filamentous masses come to the surface and become visible as slimy green mats. Spirogyra has a cell wall, nucleus, pyrenoid and spiral chloroplasts. This Elodea leaf cell exemplifies a typical plant cell. It has a nucleus, and a stiff cell wall which gives the cell its box-like shape. The numerous green chloroplasts allow the cell to make its own food (by photosynthesis). The central vacuole takes up most of the volume of the cell. Squamous cells tend to have horizontally flattened, nearly oval-shaped nuclei because of the thin, flattened form of the cell. Squamous epithelium is found lining surfaces such as skin or alveoli in the lung, enabling simple passive diffusion as also found in the alveolar epithelium in the lungs. brainliest?
Explanation:
What is natural selection
In a paragraph
This is for 8 grade but can someone help me
Answer:
Natural selection is a pressure that causes groups of organisms to change over time. Animals inherit their genetics from their parents or ancestors, and the environment is constantly changing.
Explanation:
(self-explanatory)
Which structure is represents a ribosome
Answer: I'm not sure what the question is, given there aren't any images provided to choose from, but a ribosome looks something like the picture I attached. Good luck!
Explanation:
which of the following is not a threat to biodiversity?
1. pollution and contamination
2. over hunting and over fishing
3. conservation and preservation
4. habitat loss and destruction
*15 points* Earth Science
Based on the picture, how many tilting events has this area undergone, and which principle tells us that this area has undergone tilting?
Choose the best answer for the following question:
What kind of information can be gained about an organism from its scientific name?
a
what genus it is
b
what species it is
c
where it lives
d
what genus and species it is
It is difficult to observe individual chromosomes
with a light microscope during prophase
because
A. The DNA has not been replicated yet
B. They are uncoiled, in long, thin strands
c. They leave the nucleus and are dispersed to
other parts of the cell
D. The spindle must move them to the metaphase
plate before they become visible
Answer:
I think the answer is B They are uncoiled, in long, thin strands
answer the question below
Answer:
the answer I would say would be C
if the polar bear requires 5,600,000 kcal of energy each year how much energy do the seals that it eats require each year HELP ME PLEASE it is science.
Answer:
is it multiple choice?
Explanation:
Which three statements describe events in the formation of an ecosystem in
a new pond?
O A. Algae and plants grow in the water, and small organisms eat
them.
B. Soil fills in the pond, and it no longer holds standing water.
C. Runoff carries water and organisms into a low place on land.
D D. Sunlight reaches the bottom of the pond.
Answer:
A C and D
Explanation:
its a new pond its not filled with soil.
Answer:
its A,C, and D
Explanation:
i just took the test and got it right
There are more than 300,000 species of plants that have been identified thus far in the world today; many new species are being discovered each year. In addition to providing most of the oxygen for land animals, plants do many other things for us. you will research the Internet and use reliable and credible scientific websites to investigate a specific plant species and choose a way (other than providing oxygen) that plants are useful to humans. [NOTE: Hot topic plants like Marijuana and Opium are off limits and cannot be discussed.]
Writing a full paragraph (a 150-words minimum) for your initial blog post discussing a specific species of plant and the benefit you chose. Be sure to describe what type of plant it is. Where is it found? How does it impact humans or other species? What role does it play in the ecosystem, etc.?
Answer and Explanation:
We can mention the advantages of the plants of the Fabaceae family, also known as legumes, such as beans, soybeans, peanuts and peas. First, we must mention how these plants have high nutritional values providing high levels of iron and nitrogen that are essential elements for human health. However, a benefit that these planats produce and that is important on a worldwide scale is the fixation of nitrogen in the soil. All living beings need nitrogen in their bodies, since nitrogen is a primary element in the composition of nucleic acids and proteins. Animals are able to ingest nitrogen from the vegetable diet, but vegetables cannot absorb nitrogen from the atmosphere or nitrogen from the soil, because they are not in molecular forms that plants can absorb. To reverse this, farmers put chemical fertilizers on the plantations, but these fertilizers pollute the environment intensely. It is in this scenario that the plants of the Fabaceae family are important. This is because these plants are able to associate with bacteria that can capture atmospheric nitrogen and place it in the soil, in the molecular form that all plants can absorb. This allows plants to have the necessary nutrients for their growth, reduces environmental pollution, decreases spending on agricultural production, promotes correct levels of nitrogen for human consumption and allows agricultural products to be healthier.
Which is one way that DNA replication is similar in eukaryotic cells and prokaryotic cells?
a number of replication forks
b use of the enzyme DNA polymerase
c occurs in the cell nucleus
d occurs in the cytoplasm
What is the Definition of Smog?
Answer:
Smog is air pollution that reduces visibility and can cause harm to people with breathing problems.
Explanation:
Jim observes that his pet lizard is more active on warm, sunny days than at night or during rainy days.
Which statement is the most valid hypothesis he can make from this observation?
Lizards are more active when they feel more comfortable.
Lizards like warm temperatures.
O If the temperature increases, then lizards become more active.
If the lizard is active, then the temperature must be cool.
Answer:
If the temperature increases, then lizards become more active.
Explanation:
Which of the following options best depicts the flow of information when a gene directs the synthesis of a protein?
protein>RNA>DNA
RNA>DNA>RNA>protein
DNA>RNA>protein
DNA>tRNA>mRNA>protein
Answer:
DNA → tRNA → mRNA → protein.
Explanation:
I believe that the above given option should depict the flow of information when a gene directs the synthesis of a protein.