An indirect method of estimating bacterial numbers is based on the turbidity of the sample. a ________ can be used to determine the turbidity by measuring absorbance.

Answers

Answer 1

A  spectrophotometer can be used to determine the turbidity by measuring absorbance.

What is absorbance?

The term absorbance has to do with the amount of light that can be taken in by a sample which can be used as a measure of concentration of of the bacterial numbers in a sample.

The absorbance can only be measured by the use of a spectrophotometer. Hence, a  spectrophotometer can be used to determine the turbidity by measuring absorbance.

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Related Questions

What are the two main types of weathering?

Answers

Answer:

Chemical weathering and physical weathering.

Explanation:

Why is West Ferris not running out of water?

Answers

Answer:Pq ele é bom no que faz e está sempre a paum sso a frente da humanindade

Explanation:

Because of the fresh water shortage

What gas is broken down in the Calvin Cycle

Answers

Answer:Carbon dioxide

Explanation:

Explanation:

carbon dioxide molecules

A cell contains the structure shown below that contains chlorophyll and is the site of photosynthesis. What
other cell structure that is not found in all eukaryotic cells, is likely to be found in this cell?

A. Mitochondria
B. Cell Membrane
C. Cell wall
D. Cytoplasm

Answers

The answer would be cytoplasm

The cell wall is found in plant cells but is absent in animal cells. Therefore, option C is correct.

What is a cell wall?

Cell walls are a specific type of extracellular matrix that covers every plant cell. Many of the traits that set plant cells apart from animal cells are caused by the cell wall.

Plant cells have a cell wall that surrounds their plasma membrane and offers tensile strength as well as defense against osmotic and mechanical stress. Additionally, it enables the development of turgor pressure or the pressure of the contents of the cell against the cell wall.

The pectin polysaccharide matrix, which is highly cross-linked, contains a matrix of cellulose microfibrils and cross-linking glycans that make up the cell wall. Lignin may accumulate in secondary cell walls. Therefore, option C is correct.

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There is the picture to the question

Answers

Answer:

DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD

                                                                               

Where a stream leaves a mountain range youll find an?​

Answers

A landform made of sediment that is deposited where a river flows into an ocean or lake is called a delta. An alluvial fan is a wide, sloping deposit of sediment formed where a stream leaves a mountain range.



hope this helps:))

which category of birds can find food on both land and large body of water

Answers

Answer:

A seabird can find food on both land and sea

HELPPP PLEASEE literally pleaseeeee

Answers

Answer:

high

Explanation:

you're getting too hot you are starting to sweat

In DNA, if the % of adenine is 30%, what is the % of thymine?

Answers

Answer:

35%

Explanation:

Since we know that 35% of the bases in the section of DNA are adenine, we can conclude that 35% of the bases are thymine.

A liquid is matter that
A. has a definite volume and takes the shape of its
container.
B. has a definite shape and won't take the shape of its
container.
C. has no shape, and its volume changes randomly.
D. has a volume that changes with its container.

Answers

Answer:

272939

Explanation:

373773737384848

Answer is D =). Ur welcome sowwy if I’m wring

Which gas is released during the light reactions of photosynthesis?
A. Carbon dioxide gas
B. Oxygen gas
C. Nitrogen gas
D. Methane gas



A species of bacteria is found deep within the Earth’s crust. Which process will the bacteria use to obtain energy?
A. Cellular Respiration
B. Photosynthesis
C. Lactic Acid Fermentation
D. Alcoholic Fermentation

Which of the following is not a reactant needed for photosynthesis?
A. Sunlight
B. Oxygen
C. Carbon Dioxide
D. Water

Answers

Answer:

B for your first question.

A for your second question.

B for your third question.

Explanation:

I hope this helps!

What type of metamorphosis does a monarch butterfly undergo?

1. complete metamorphosis
2. incomplete metamorphosis

Answers

Answer:

1. complete metamorphosis

Answer:

Complete Metamorphosis

Explanation:

This means that there are four distinct stages: an egg, larva (caterpillar), pupa (chrysalis), and adult stage. 

What conditions allowed so many different kinds of mammals to
evolve during the Cenozoic Era?

A. Grasses evolved providing food to larger grazing animals, no dinosaurs which made way for mammals
B. Overpopulation of ocean algae allowed for more fish to thrive following more species of fish to exist
C. No dinosaurs so mammals were forced to evolve or die
D. More macrobiotic organisms caused the evolution process to happen at a quicker rate

Answers

Answer:

A. Grasses evolved providing food to larger grazing animals, no dinosaurs which made way for mammals

Which answer choice accurately depicts the sequence by which blood moves from the pulmonary vein to the body tissues?

Answers

Answer:

See the answer below

Explanation:

Oxygen-rich blood flows from the lung through the pulmonary vein to the left atrium of the heart. From there, the blood is pumped through the mitral valve to the left ventricle. The contraction of the left side of the heart sends the oxygenated blood out of the left ventricle through the aortic arch to the major arteries designated to carry blood to the major parts of the body. From the arteries, blood moves to the capillaries and then to the various tissues of the body before returning back to the heart through the vein.

Thus, the sequence of flow of blood from the pulmonary vein to the body tissues can be summarized as:

Pulmonary vein -> Left atrium -> Arteries -> Capillaries -> tissues

The special job an organism plays in it's ecosystem is it's __________.
biome

population

niche

biodiversity

Answers

Answer:

Niche

Explanation:

The role a species plays in the ecosystem is called its niche. A habitat is the physical environment in which a species lives.

Answer:

niche

Explanation:

The role a species plays in the ecosystem is called its niche. A habitat is the physical environment in which a species lives.

NEED HELP ITS DUE AFTER MY WINTER BREAK!

Answers

Answer:

For question 1 the answer is respiratory, and for question 2 is circulatory

Answer: (1) Circulatory (2) Respiratory

How is fish adapted? Write any two adaptational characters of them.​

Answers

1.Grew gills
2.Grew tails

What do coal deposits tell you about the continents?

Answers

Answer:

Coal deposits are found in sedimentary rock basins, where they appear as successive layers, or seams, sandwiched between strata of sandstone and shale.

When compared to a cheek cell, a muscle cell would contain more

Answers

Answer:

Chromosomes

Explanation:

The routes nerve impulses from our senses.
A. thalamus
B. hippocampus
C. brain stem
D. corpus callosum

Answers

Answer:

a

Explanation:

The correct answer is C. Brain Stem.

How does the brain stem function?

The thalamus and other areas of the brain receive nerve signals from our senses through the brain stem. It is made up of the medulla, pons, and midbrain and is situated at the base of the brain.

The brain stem is in charge of regulating life-sustaining processes including breathing, heart rate, and blood pressure. It is also in charge of transmitting sensory data from the body to the thalamus, which subsequently transmits the data to the relevant parts of the brain.

Although the brain stem is the main pathway for nerve impulses from our senses, the hippocampus, corpus callosum, and thalamus are all important in the processing of sensory information.

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A cell is placed in a hypertonic solution. Which will most likely occur as homeostasis is maintained in the cell?

A.
The cell will gain ATP molecules.

B.
The cell will gain water.

C.
The cell will lose water.

D.
The cell will lose sodium ions.

Answers

Answer:

B the cell will lose water

Explanation:

Because of the hypertonic solution water will move on the concentration gradient leaving the cell and entering the solution. Thus the cell looses water.

When a cell is placed in a hypertonic solution, it will most likely lose water (Option C) as homeostasis is maintained in the cell.

What is homeostasis?

Homeostasis is the ability of an organism or a system to maintain a relatively stable internal environment, despite changes in external conditions. It is a key aspect of biology that helps living organisms survive in their environment. Homeostasis is maintained through a series of physiological processes that regulate different aspects of an organism's biology, such as temperature, fluid balance, and pH

A hypertonic solution is one that has a higher concentration of solutes (e.g. salts) outside the cell compared to inside the cell. This creates an osmotic pressure gradient, which draws water out of the cell and into the solution in an attempt to balance the concentration of solutes on both sides of the cell membrane. As a result, the cell will shrink and lose water.

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Need help on this *URGENT*

Answers

answer : divergent - the arrows show that the plates are moving apart.

The early ancestors of horses showed the presence of digits on their limbs, while modern horses have hooves. What are likely possible reasons for this change?

Answers

Answer:

The digets were most likely not needed anymore so as the horses evolved hey gain other traits to help them survive.

All developed countries, in some way, are moving towards which type of energy?
Non-Renewable Energy
Solar Energy
Non-Pollutant Energy
Renewable Energy

Answers

Answer:

Renewable Energy

Explanation:

Explain how an animal grows?

Answers

Answer:

big liitle fat

Explanation:

Answer:

The primary way that animals grow and develop is by building more cells. When an animal eats food, its body breaks the food down and uses it to fuel its energy requirements and build new cells through the process of mitosis. These new, or daughter, cells are often similar in size to the old, or parent, cells.

Explanation:

11)
How are genetic mutations passed from parent to offspring?

Answers

Answer:

Some mutations are hereditary because they are passed down to an offspring from a parent carrying a mutation through the germ line, meaning through an egg or sperm cell carrying the mutation. There are also nonhereditary mutations that occur in cells outside of the germ line, which are called somatic mutations.

I hope it's helpful!

Answer:

★ Mutated gametes (sex cells) fuse to create offspring.

Genetic mutations or germline mutations can be defined as a permanent change in the DNA sequence of germ cells (cells, which form ovum and sperm). These mutations can pass from one generation to other when a mutated sperm or mutated oocyte (gametes) get fertilized with another oocyte or sperm.

A germline mutation, present in a single-celled zygote will present in all cells of a muticellular organism, a single-celled zygote divides and produces all of the cells in that organism.  

Explanation:

Hope you have a great day :)

Hydrophobic interactions are the basis for Sudan tests. Explain how hydrocarbons in lipids interact with polar surroundings

Answers

Answer and Explanation:

Lipids are non-polar molecules, so they do not interact preferentially with polar molecules but they can interact with each other. In a polar medium, such as water, the hydrocarbons in lipids aggregate each other, in order to minimize contact with surrounding polar molecules. The interaction between non-polar solutes with polar surroundings exclusion is called hydrophobic interaction.

5 important things Gregor John Mendel did

Answers

1- discovered the fundamental laws of inheritance

2-He deduced that genes come in pairs

3- He said genes are inherited as distinct units

4-(About genes)one from each parent.

5-tracked the segregation of parental genes and their appearance in the offspring as dominant or recessive traits.


What happened at point B? Why?

Answers

Answer:

population has decreased over that period ,MAyBe

Explanation:

I don't know why

Big thanks to anyone that can help with this <3

Answers

Answer:

1a. To collect and remove waste materials from the body.

2c. Urinary bladder.

3d. Urea

4c. Remove urea and excess water.

Explanation:

The main function of our excretory system is to collect and remove waste materials from our body because these waste materials are toxic and cause damaged our body. Urinary bladder is the organ that stores urine. Urea is present in the urine under normal conditions of the body which is waste material produced our body. The main function of kidney is to remove urea and excess water from our body.

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