Answer:
See the answer below
Explanation:
The stock solution of Gentamycin has a concentration of 5 mg/ml while each plate needs to contain 50 micrograms/ml of Gentamycin.
5 mg/ml = 5000 micrograms/ml
There is a need to dilute the stock antibiotic solution in order to arrive at 50 micrograms/ml. Using the dilution principle;
m1v1 = m2v2
5000 x 1 = 50 x v2
v2 = 5000/50 = 1000 ml
Hence, in order to prepare 50 micrograms/ml, 1 ml of the stock Gentamycin should be taken and diluted with 999 ml of distilled sterilized water. 1 ml of the diluted Gentamycin will then be added to each agar plate while they are still in the molten form at a warm temperature.
What is the diference between the question and hypothesis steps in scientific inquiry? a. The question step provides the question to be studied, while the hypothesis step provides a proposed answer to the question b. The question step involves putting the hypothesis into question format C. The question is the problem to be studied, while the hypothesis is the answer found alter experimentation, d. There is effectively no difference between the two steps. Please select the best answer from the choices provided.
Answer:
the answer is ( A )
Explanation:
poggers
A meteorologist who has been analyzing weather data from the last fifty years found evidence of climate change. An ecologist has been studying deposits of pollen from the last fifty years to track the types of plants that grew
in certain regions. She has also found evidence of climate change. What does this imply about science?
Meteorology and ecology are the same type of science
When scientific disciplines overlap, researchers should choose new topics
O Different scientific disciplines can be used to investigate similar questions
There should be fewer sciences, as they seem to answer the same questions
The correct answer is C. Different scientific disciplines can be used to investigate similar questions
Explanation:
The general purpose of science is to study, analyze, and understand the world and especially natural phenomena. Moreover, science includes multiple disciplines with different focuses; for example, astronomy focuses on objects in the space.
Despite this, all disciplines in sciences have objective methods. This causes scientists to obtain the same results or findings even if they belong to different disciplines, and therefore, the same questions or phenomena can be studied from different disciplines. An example of this is that a meteorologist and an ecologist find evidence of climate change. According to this, "different scientific disciplines can be used to investigate similar questions".
Answer:
The correct answer is C. Different scientific disciplines can be used to investigate similar questions
Which is an abiotic factor of a marine ecosystem?
A. food produced
B. temperature change as you go in deeper in the ocean
C. reproduction of animals
Answer: The topmost part of a marine ecosystem is the euphotic zone, extending down as far as 200 meters (656 feet) below the surface.
Explanation: Sunlight is one the most important abiotic factors for marine ecosystems.
Hope this helped! :)
In the
part of photosynthesis, sugar is formed.
Answer:
Light-Dependent reaction
Explanation:
Its logic really, a way for a plant to receive and begin photosynthesis is by sunlight. Therefore when there's a light dependant reaction, sugar is formed. hope it helped
[tex]C_3[/tex] photosynthesis is used by most plants in which a three-carbon compound called 3-phosphoglyceric acid is produced during the Calvin cycle, which becomes a sugar called glucose.
What is [tex]C_3[/tex] photosynthesis?Light energy capture for sugar production during [tex]C_3[/tex] photosynthesis occurs within the chloroplast where light energy is captured by a noncyclic electron transport process that uses the thylakoid membrane for the necessary electron transport. About 85% of plant species are [tex]C_3[/tex]plants.
During this pathway, the first molecule produced in the cycle which is a 3-carbon molecule called 3-phosphoglyceric acid, so it is called [tex]C_3[/tex]photosynthesis.
Thus, [tex]C_3[/tex] photosynthesis is used by most plants in which a three-carbon compound called 3-phosphoglyceric acid is produced during the Calvin cycle, which becomes a sugar called glucose.
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What is the interpretation of the influence of the heavenly bodies on
human affairs.
O Astronomy
Astrology
Asteroid
Android
What do you think the job of lysosomes is
based on the short animation provided?
hold DNA
build things
digest things
let things in and out of cells
Answer:
digest things
Explanation:
You can see in the animation that lysosome is digesting
PLS HELP :( 25 POINTS + BRAINLIEST!!
What does a pyramid of biomass represent ?
Answer:
A pyramid of biomass shows the total biomass of the organisms involved at each trophic level of an ecosystem. ... There can be lower amounts of biomass at the bottom of the pyramid if the rate of primary production per unit biomass is high.
Explanation:
Answer:
A.
Explanation:
Number of total organisms within each trophic level.
10 things you can do to help save the earth
HELPPPPP!!!!!
which steps can a community take to help its members follow the guidelines? state your answer as a claim. support your claim with evidence from the article. think about how communities can make doing these things easier. then explain why the evidence from the text supports your claim
Reduce, reuse, and recycle. Cut down on what you throw away. Follow the three "R's" to conserve natural resources and landfill space.
Volunteer. Volunteer for cleanups in your community. You can get involved in protecting your watershed, too.
Educate. When you further your own education, you can help others understand the importance and value of our natural resources.
Conserve water. The less water you use, the less runoff and wastewater that eventually end up in the ocean.
Choose sustainable. Learn how to make smart seafood choices at www.fishwatch.gov.
Shop wisely. Buy less plastic and bring a reusable shopping bag.
Use long-lasting light bulbs. Energy efficient light bulbs reduce greenhouse gas emissions. Also flip the light switch off when you leave the room!
Plant a tree. Trees provide food and oxygen. They help save energy, clean the air, and help combat climate change.
Don't send chemicals into our waterways. Choose non-toxic chemicals in the home and office.
Bike more. Drive less.
Answer:
5 things to save the earth(i can't think of any more)
Explanation:
reuse a water bottle
pick trash up
take shorter showers
recycle
open a window instead of using the AC
How would you go about isolating your pure culture?
Explanation:
Simpler methods for isolation of a pure culture include: (i) spread plating on solid agar medium with a glass spreader and (ii) streak plating with a loop. The purpose of spread plating and streak plating is to isolate individual bacterial cells (colony-forming units) on a nutrient medium.
a large hurricane destroys a coastal habitat. what type of disruptive event does this describe?
periodic
random
extinctive
episodic
Answer:
periodic
Explanation:
Answer:
Periodic
Explanation:
What type of electrical charge do atoms have?
Mutations in several different genes that encode enzymes in the pathway for the synthesis of the heme group may cause a genetic disorder called methemoglobinemia. The symptoms of this disorder range form mild to death in the most severe cases. The enzyme cytochrome b5 reductase is one of the enzymes in this pathway. This enzyme is responsible for reducing the iron in the heme group to the ferrous state so that it can bind oxygen. Kobayashi et al. reviewed several mutations in this gene. One of these mutations causes a Ser to Pro substitution. Explain what nucleotide change and in which position in the codon can cause this amino acid change. Assign all possible appropriate terms to this mutation.
Answer:
Please find the explanation of the nucleotide change below
Explanation:
Mutation is any change that occurs to the nucleotide sequence of a gene. According to this question, a substitution mutation which causes the Serine amino acid to change to Proline amino acid in the cytochrome b5 reductase enzyme is described.
A substitution mutation is a type of mutation in which one or more nucleotide base is replaced by another. The mRNA codons that specify Serine and Proline amino acids are as follows:
Serine: UCU, UCC, UCA, UCG, AGU, AGC
Proline: CCU, CCC, CCA, CCG
Based on the observation of these bases, URACIL BASE in the first four listed codons for serine amino acid is replaced by CYTOSINE BASE. i.e.
UCU (serine) -> CCU (proline)
UCC (serine) -> CCC (proline)
UCA (serine) -> CCA (proline)
UCG (serine) -> CCG (proline)
Notice that these base substitutions (U-C) occur in the 1st position of the codon.
How are Metamorphic Rocks formed?
A. through compaction and cementation
B. through crystallization and solidification
C. through heat and pressure
D. through weathering and erosion
A manager wanted to test whether the amount of noise in a clothing factory affected how
much work employees accomplished. Three groups of employees were tested every day
over a 5-day period. All three groups did the same type of work, they were all equally trained
to do the work, they used the same equipment, and they were tested the same time of day.
Group one was given headphones that blocked out all of the outside noise. Group two was
given headphones that blocked out some of the noise. Group three was not given anything
to block out the noise. The number of shirts made by the employees in one hour was
determined.
What is the independent/manipulated variable?
the amoutn of noise
the number of shirts made by the employee
the type of music the employees listen to while they work.
The amount of training employees need.
Answer:
When seeking to determine the number of shirts made by employees subjected to noise with and without the use of headphones, the independent variable is the amount of noise.
Explanation:
During an investigation, the independent variable may be subject to change, in order to observe the effect it will have on the dependent variable.
In the case presented, the amount of noise to which employees are exposed represents the independent variable, which is modified by the use of headphones that block all or part of the noise.
The productivity —expressed in the number of shirts made— can be expected to be higher for employees not exposed to noise.
Other options do not apply because:
The number of shirts made by the employee. Dependent variable .The type of music the employees listen to while they work or the amount of training employees need. These are not the variables studied.this compound makes up the building blocks for all plant structure. plants can use it for energy and animals eat the plant to be able to get energy from this organic which organic compound is this?
The answer is :-
proteinWhich examples describe results of globalization?
Choose all answers that are correct.
spread of innovations
increase in death rate
damage to some cultures
cultural blending
Answer:
b
Explanation:
A characteristic which differentiates eukaryotic cells from
prokaryotic cells is eukaryotic cells have-
A. a cell membrane that controls the flow of materials in and
out of the cell
B. genetic material (DNA) which controls the cell's activities
C. a jelly-like substance called cytoplasm that holds the
organelles
D. a centrally located nucleus that contains the DNA of the
cell
Answer:D.
Explanation: Eukaryotic cells have a nucleus while prokaryotic cells dont. The nucleus store the DNA so that means that prokaryotic cells have their DNA floating around in them while eukaryotic cells have their dn6in the nucleus alone.
Answer:
D
Explanation:
got an 100 on edge :)
The genetic code is ____________because almost every living organism has the same genetic code.
The genetic code is *UNIVERSAL*
How is osmosis different from diffusion?
A. Osmosis refers to substances moving up a concentration gradient, while diffusion refers to substances moving down a concentration gradient
B. Osmosis is a form of passive transport, while diffusion is a form of active transport
C. Osmosis is a form of active transport, while diffusion is a form of passive transport,
D. Osmosis refers specifically to the diffusion of water.
Help me plz hurrrrrrrrrrrrry An ice cube is placed inside a thermos and the lid is closed. The ice cube
eventually melts. Most of the thermal energy that melts the ice comes from
which source?
O A. The liquid water that forms
OB. The air surrounding the thermos
O c. Water vapor from the air
O D. The bonds between water molecules
Answer:
its B
Explanation:
coz it is
Write a sentence or two connecting these terms highlighting each: Genes, genetics, Genome, protein, trait.
Answer:
Please find the sentence below
Explanation:
GENETICS is the study of individual genes present in the GENOME of an organism. In the GENOME, which is the complete set of GENES in an organism, genes that contain the information needed for the synthesis and transmission of useful products called PROTEINS undergo genetic expression. Gene expression involves two major processes viz: transcription and translation.
Transcription involves the synthesis of an mRNA from the information encoded by a GENE while translation involves the synthesis of a PROTEIN from the information encoded by the mRNA transcript. The produced protein is responsible for bringing about certain TRAITS, which are observable characteristics, in living organisms.
Therefore, the central dogma of biology is the process that sees GENE converted to mRNA and mRNA converted to PROTEIN.
Can someone please try and help me? I've been getting ignored so much, this is due at 4:50. Please please, help :( answer all
Answer:
1. Radiant Energy
number 13 is Trade Winds
The diameter of a human blood cell is 0.0000062 m. How can this number
best be expressed in scientific notation?
A. 6.2 x 10-5 m
B. 6.2 x 10-6 m
C. 6.2% -106 m
D. 62 x 10-5 m
SUBMIT
Answer: B. 6.2 x 10-6 m
Explanation:
just took the test and it is B.
Scientific notations are used to express numbers that are too large of too small. The diameter of human blood cell is 0.0000062m can be written as 6.2 × 10⁻⁶m.
Thus, the correct option is B.
What is Scientific notation?Scientific notation is a way of expressing numbers that are too large or too small to be conveniently written in decimal form. It may be referred to as scientific form, or standard form in the United Kingdom.
Scientific notations can be written with the base of the number be always 10. The exponent must be a non-zero integer, it can be either positive or negative. The absolute value of the coefficient is greater than or equal to 1. Coefficients can be positive or negative numbers including whole and decimal numbers depending upon the value of the number. For example, 650,000,000 can be written in scientific notation as 6.5 × 10⁸.
The diameter of human blood cells = 0.0000062 m
It can be written as 6.2 × 10⁻⁶m as well for easy understanding.
Therefore, the correct option is B.
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Thuy wants to advocate for clean air laws. Which field of study would be most useful to her?
A. Zoology
B. Microbiology
C. Earth science
D. Marine science
Answer: C. Earth Science
Explanation:
Answer:
c.
Explanation:
just took the test
Imagine a bacterial population of 100 cells. Five of the cells are resistant to sulfonamides, and six other cells are resistant to erythromycin. In the development of drug-resistant bacteria, which of the following selects for resistant bacteria? Drag the terms on the left to the appropriate blanks on the right to complete the sentences. Terms can be used once, more than once, or not at all.
Answer:
39
Explanation:
When u have 100 cells and most of them are resestant to drugs most people have 39 cells
When we have 100 cells and most of them are resestant to drugs most people have 39 cells.
Thus, Bacterial communities invariably include a variety of clonal lineages. Since recombination exchanges across lineages and species mobilize tiny genomic fragments, bacterial populations are not fully asexual.
Recombination, as opposed to de novo mutation, contributes differently to the creation of novel bacterial genotypes in different bacterial populations, and as this contribution rises, clonality in a particular population diminishes.
As a result, there is a wide range of potential population architectures, with only a few bacterial species existing at the extremes of being entirely non-clonal and very clonal. the examination of samples of bacterial isolates that are true representations of the natural population.
Thus, When we have 100 cells and most of them are resestant to drugs most people have 39 cells.
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Scientists connect data points on graphs with a dashed line because information between the plotted data is:
approximate
inferred
interpolation
all of the above
The answer is all of the above
Answer:
all of the above
i just took the lesson
Why will an Elodea plant from a freshwater pond wilt when placed in salt water?
A. The vacuole will begin to expand because of extreme pressure.
B. The cell wall will begin to expand because of extreme pressure.
C. Freshwater will move out of the cells of the plant.
D. Salt water will move out of the cells of the plant.
Answer the answer is (c)
A strange new species of plant has been discovered. When studying the chromatin from the cells of this plant using the kinds of experiments described above in (b) a 120-bp fragment of DNA is seen. Analysis of the histone core reveals histones in the following proportions: H2A 33.3% H2B 33.3% H3 0% [no histone H3 found] H4 33.3% On the basis of these observations, what conclusions can you make about the probable structure of the nucleosome in the chromatin of this plant? Be specific in describing the nature of the nucleosome: which histones form the core (1pt), how many of each are in there (1pt) and how much core-DNA is around it (1pt).
Answer:
The nucleosome core is composed of two each of histones H2A and H2B and H4
Explanation:
The nucleosome is the basic structural unit of all eukaryotic genomes. A nucleosome is composed of approximately 146 base pairs of DNA sequence wrapped around a core of histone proteins, which generally consists of two subunits of the histones H2A, H2b, H3 and H4, respectively (i.e., an octamer of histone proteins). Within the cell nucleus, the large DNA molecule is coiled into nucleosomes, this structure is further compacted into chromatin fibers and subsequently into higher-order organization structures to finally form a chromosome.
How does water move on Earths surface?
