Answer:
b
Explanation:
The correct answer would be 6.4 x [tex]10^6[/tex] cells/ul.
For 1 x 10-6 dilution, the plating factor is [tex]10^6[/tex]. To find the number of bacteria in the original sample, the plating factor is multiplied by the colony count per ul.
Number of viable bacteria = plating factor x colony count/ul
Since 10 ul gives 64 colonies. 1 ul will give:
64/10 = 6.4 colonies.
Therefore, the viable bacteria in the original sample = 6.4 x [tex]10^6[/tex] cells/ul
The correct option is b.
Based on your knowledge of reproduction in bryophytes and ferns, is the presence of flagellated sperm in cycads surprising? Why or why not?
Answer:
The correct answer is - All plants share a similar life cycle
Explanation:
The sperms that the bryophytes are biflagellated whereas in ferns these are multi-flagellated that helps in the swimming to the archegonia or female part to perform the fertilization, due to the presence of water.
The sperms in cycads also have flagella for the same purpose of swimming in the pollen tube. The ferns and the bryophytes both require the same or similar life cycle that includes the flagella and water for the formation of the zygote.
what determines the physical and chemical properties of a mineral?
Answer: Determines the properties of a mineral by the composition and structure .In such as: : colour, taste, tenacity, magnetism, fracture, streak, specific gravity, [ amount of transparency and crystalline structure.
The term semiconservative replication refers to the fact that each new DNA molecule resulting from the replication process is "half-old, half-new." In the diagram, complete the replication required in the
middle of the molecule by adding the required letters representing the missing nucleotide bases. Recall
that ATP energy and the appropriate enzymes are actually required to complete this process.
Answer:
1. A
2. C
3. T
4. G
5. G
6. G
7. T
8. G
9. A
10. C
11. C
12. C
Explanation:
As stated in this question, Semi-conservative model of DNA replication is the acceptable model of replication in which the two synthesized molecules of DNA consists of one new and one old strand each. DNA replication is carried out by an enzyme called DNA polymerase.
In the semi-conservative model, a double stranded DNA separates into two single strands. Each single strand is used as a template for DNA polymerase to synthesize nucleotides based on complementary base pairing i.e. For every Adenine base, Thymine is added and for every Guanine, Cytosine is added and vice versa.
In this question showing an image of a DNA molecule undergoing replication using semiconservative model, the first DNA molecule consists of the following nucleotides on the old strand and its synthesized nucleotides on the new strand:
Old strand - New strand
1. T - A
2. G - C
3. A - T
4. C - G
5. C - G
6. C - G
On the second DNA molecule, we have the following nucleotides on the old strand and its synthesized nucleotides on the new strand.
Old strand - New strand
7. A - T
8. C - G
9. T - A
10. G - C
11. G - C
12. G - C
Suppose we stock a pond with 100 fish and note that the population doubles in the first year (with no harvesting), but after a number of years, the population stabilizes at what we think must be the carrying capacity of the pond: 2,000 fish. Growth seems to have followed a logistic curve. a. What population size should be maintained to achieve maximum yield, and what would be the maximum sustainable fish yield? b. If the population is maintained at 1,500 fish, what would be the sustainable yield?
Answer:
Explanation:
From the given information,
The first process is to determine the initial growth rate by using the formula:
[tex]R_o = \dfrac{In(2)}{t_d}[/tex]
where;
The initial growth rate(constant) = [tex]R_o[/tex] ; &
the doubling time = [tex]t_d[/tex] = 1 year
[tex]R_o = \dfrac{In(2)}{1 \ year}[/tex]
[tex]R_o[/tex] = 0.693 / year
Now, we move up to the net stage to find the growth constant by using the formula:
[tex]r = \dfrac{R_o}{(1 - \dfrac{N_o}{K})}[/tex]
where;
[tex]N_o[/tex] = population of fish in the pond = 100
[tex]R_o[/tex] = The initial growth rate(constant) = 0.693 /year
K = carrying capacity = 2000
Then;
[tex]r = \dfrac{0.693 \ /year }{(1 - \dfrac{100}{2000})}[/tex]
[tex]r = \dfrac{0.693 \ /year }{(1 - 0.05)}[/tex]
[tex]r = \dfrac{0.693 \ /year }{(0.95)}[/tex]
r = 0.730 / year
a)
Now, the maximum yield can be evaluated by using the expression:
[tex]= \dfrac{rk}{4}[/tex]
[tex]= \dfrac{0.730 \times 2000}{4}[/tex]
= 365 fish per year
Also, the maximum sustainable yield is said to be half of the carrying capacity suppose that the population growth obeys logistic curve;
i.e.
[tex]N' = \dfrac{1}{2} \times 2000[/tex]
N' = 1000 fish
b)
If the population is maintained at 1500 fish;
The sustainable yield can be calculated by using the formula:
The Sustainable yield = [tex]r\times N (1 - \dfrac{N}{K})[/tex]
The Sustainable yield = [tex](0.730/ year ) (1500) (1 - \dfrac{1500}{2000})[/tex]
The Sustainable yield = 1095 × 0.25
The Sustainable yield = 273.75 fish per year
The Sustainable yield ≅ 274 fish per year
Population size should be maintained to achieve maximum yield and Sustainable yield if population is maintained at 1,500 fish are 364.7 , 273.525 fish per year
Sustainable yield:Given that;
Stock in start = 100 fish
Double in 1 year
Capacity of pond = 2000 fish
Find:
Population size should be maintained to achieve maximum yield
Sustainable yield if population is maintained at 1,500 fish
Computation:
Growth rate = ln₂ / 1
Growth rate = 0.693 per year
With no growth constraint r = [tex]\frac{0.693}{1-\frac{100}{2000} }[/tex]
With no growth constraint r = 0.7294 per year
A. Population size should be maintained to achieve maximum yield = [tex]\frac{0.7294 \times 2000}{4}[/tex]
Population size should be maintained to achieve maximum yield = 364.7 fish per year
B. Sustainable yield if population is maintained at 1,500 fish = [tex][(0.7294))(1500)][1-\frac{1500}{2000} ][/tex]
Sustainable yield if population is maintained at 1,500 fish = 273.525 fish per year
Find out more information about 'Sustainable yield'
https://brainly.com/question/24614592?referrer=searchResults
Why do you think ANIMAL CELLS are able to survive without the types of cell walls that are present in nearly every other group of organisms? Provide 3 answers.
Answer:
They survive because these cells need a high permeability to be able to maintain the internal cellular balance in relation to the external environment that surrounds them, and this is due to their high energy demand, their multi-complex and multiple functions, and the capacity for constant homeostasis with the environment. that surrounds them.
Explanation:
In addition, some cells need to transmit signals, second messengers or even to fulfill a function to exchange compounds for their transmembrane, this is what makes the human system together with other systems of other animals is extremely open and is in constant energetic exchange, in addition to Unlike plant cells, plant cells are under an autonomous regime, they do not need to take energy from the environment but they manufacture it themselves, and it fulfills a great function that is to provide structure and support, the wall they have is what gives it the ability to fulfill these two functions.
CAN SOMEONE PLEASE HELP ME WITH THIS SCIENCE QUESTION THANK YOU!!
Answer:
A.Negative Growth
Explanation:
2. Which of the following statements best describes exocytosis ? *
(1/1 Point)
The way cells grow and become adult cells
The way cells get rid of waste products
The way cell communicate with each other
The way cells take in food and other materials
O
Which helps in the production of eggs?
testosterone
estrogen
semen
fallopian tube
Answer:
Semen helps in the production of eggs!
answer:
... semen...
explanation:
i'd be embarrassed to explain that bit
pls help !!!!!!!!!!!
the answer is isotonic
How many hydrogen atoms are present in each water molecule?
A.
1
B.
3
C.
2
D.
4
Answer:
C. 2
Explanation:
HELP ME ASAP!!!!
Select the correct answer.
Gina is scuba diving when she notices a large fish glide over her. It has a flattened body and she notices gills on its underside. Which taxonomic
group does the fish belong to?
A.
Selachii
B.
Batoidea
C.
Sarcopterygii
D.
Actinopterygii
Answer:
Your answer is B) Batoidea. Batoidea is a superorder of cartilaginous fishes commonly known as rays.
Answer:
b because the guy above me said so
I’m stuck with this Encryption Table, if anyone can please help me solve this I would appreciate it very much.
Answer:
hu7gf6dcxyxycjc c.f. c ycyftc Tx tv hcv12345678910112131415161727 8gh
Purple petal color in pea plants is dominant to white petal color. Two heterozygous pea plants are crossed.
Answer:
what do you need to know?
Explanation:
Answer:
use a punnett square if you need help u can ask me
large balen whales, and even whale sharks feed primarily on plankton communities. How can such samll organism provide food for such large animals?
Answer:
plankton my look small but if you have a micoscope they are pretty big and no not because it is zoomed on them
Explanation:
do not question me smarts i am smart tho lot smarter then you think i am
19. What macromolecule is common to surface markers, receptors,
carriers and channels? *
protein
carbohydrate
lipid
nucleic acid
Rough ER is mostly responsible for
making -__-, whereas smooth ER is
mostly responsible for making
Explanation:
The rough ER, studded with millions of membrane bound ribosomes, is involved with the production, folding, quality control and despatch of some proteins. Smooth ER is largely associated with lipid (fat) manufacture and metabolism and steroid production hormone production.
Which term best describes the organic molecule below?
Hint: There is a double bond in the center of the chain.
A. Cholesterol
B. Phospholipid
C. Saturated fatty acid
D. Unsaturated fatty acid
As a result of the double bond in the organic molecule below, we can tell that it is a D. Unsaturated fatty acid.
Unsaturated fatty acids:
Have at least a single double bond in their structure Are usually liquid at room temperature Are categorized into monounsaturated and polyunsaturatedOleic acid has a single double bond which makes it an unsaturated acid. It can be further classified as a monounsaturated acid due to it having just that one double bond.
In conclusion, Oleic acid is an unsaturated fatty acid on account of its double bond.
Find out more at https://brainly.com/question/4891995.
how do unicellular and multicellular organisms differ?
Answer:
Unicellular organisms- Organisms which have only single cell are called unicellular organisms.
Multicellualr organisms- Organisms with many cells are called multicellular organisms.
Answer:
multicellular organisms need organs to function properly
Explanation:
Covalent bonds can be best described as neutral atoms coming together to share electrons. neutral atoms coming together to create electrons. ionized atoms coming together to trade electrons. ionized atoms coming together to destroy electrons.
Answer:
neutral atoms coming together to share electrons.
Explanation:
Answer:
The answer is neutral atoms coming together to share electrons.
Explanation:
Bc covalent compounds are compound whose atoms form bonds by sharing electrons
Have a great day!!
When plants undergo photosynthesis, a reaction produces sugar, oxygen, and water. During respiration, stored energy from the products of photosynthesis is converted to usable energy. In what form is the energy stored prior to use in respiration?
A. Light energy
B. Kinetic energy
C. Heat energy
D. Chemical energy
Answer:
chemical energy
Explanation:
What is the role of lay person like you in the mission of the church today?
Explanation:
base on the person opinion
You are given a protein with the following amino acid sequence:
methionine (nonpolar)-glycine (nonpolar)-serine (polar)-alanine (nonpolar)-lysine (polar)
If an amino acid substitution occurred in this polypeptide chain, predict which option would have the most
significant impact on the structure and function of the protein.
a. Serine is replaced by lysine (polar)
b. Glycine is replaced by alanine (nonpolar)
c. Alanine is replaced by leucine (nonpolar)
d. Lysine is replaced by tryptophan (nonpolar)
?
Answer:
d. Lysine is replaced by tryptophan (nonpolar)
Explanation:
Amino acid substitutions can have varying affects on the protein function, depending on the specific substitution and the location of the substitution.
If the substitution occurs in an important region, for example an enzyme active site, then the function of the protein could be destroyed.
Additionally, if the substitution replaces the amino acid with a highly different amino acid with different properties (eg. polarity), it could alter the structure and function of the protein.
Replacing lysine (polar) with a tryptophan (non-polar) changes the properties of the amino acid at that location, whereas the other substitutions do not.
Succession Interactive!
What is the difference between primary succession and
secondary succession?
Primary succession occurs in an area that is disrupted by a
fire or other natural disaster but secondary succession does
not.
Primary succession occurs after secondary succession.
Primary succession involves only plants but secondary
succession involves animals too.
Primary succession occurs in an area with no life and no soil
but secondary succession happens in an area where an
existing community was disrupted.
Answer:
Primary succession occurs in an area with no life and no soil but secondary succession happens in an area where an existing community was disrupted.
Explanation:
Ecological succession, which is the series of changes that occurs in an ecosystem over a period of time, can be divided into two types namely: primary succession and secondary succession.
- Primary succession is a kind of succession in which a bare surface or rock is colonized by certain organisms called PIONEERS. Primary succession occurs in an area with no life and no previous soil.
- On the contrary, secondary succession occurs in an area that has been previously colonized but disturbed as a result of natural occurrences e.g earthquake, wildfire, flooding etc.
Which phrase best defines homeostasis
Answer:
maintaning the essential internal parameters relatively constant is the phrase that best describes the process of homeostasis.
Notice on the graph that the time period between 0 and 3 minutes forms a straight line on the graph.
What does this indicate about the rate of the reaction?
Answer:
The graph is positive.
Explanation:
Straight line on the graph indicates that the rate of reaction is positive which means that reaction intensity increases with the passage of time. OR in other words, the reaction produces more products with the passage of time and no decrease occurs in their rate because the graph is not coming downward or changing so that's why the graph go in the straight line.
The process by which a modified stem or root of a parent plant grows offspring that remain attached is called(1 point)
vegetative reproduction.
fragmentation.
binary fission.
tuber reproduction.
Answer:
vegetative reproduction
Explanation:
～( TロT)σ believe it
You want to know if black squirrels or brown squirrels have a greater birth rate. Your ALTERNATIVE hypothesis is:_________.
Answer:
Natural selection is a mechanism of evolution proposed by Charles Darwin. It is the differential survival and reproduction of individual due to the difference in the phenotype. Over time, this process results in populations which are better adapted to their environment as they tend to survive and produce new offspring. The brown squirrels with thick coat survive at a higher rate than the brown sqirrels without the thick coat. Thick coat is a adaptation for survival in cold winters which are chosen over the other and allowed to reproduce.
Explanation:
Is thigmotropism is caused by water?
Answer: No. Hydrotropism is caused by water
Explanation:
Which of the following mRNA codons will bind to the tRNA anticodon 5' GCU 3', considering wobble–base pairing rules. Select one:
a. 5' CGA 3'
b. 5' AGU 3' and 5' AGC 3'
c. 5' AGC 3'
d. 5' UGA 3' and 5' CGA 3'
Answer:
a. 5' CGA 3
Explanation:
The wobble type of base pairing also comprises the base pairs formed by inosine (I) also called hypoxanthine with Cytosine(C), Thyamine(T), or Adenine (A),
Where purine base pairs A to G(or I), A to A, and G to C.
Where
5' GCU 3' pairs with
5' CGA 3
Therefore G pairs to C, C pairs to G, U pairs with A.
Explain how weathering and erosion can make a cave. Is it physical or chemical weathering?
Answer: Weathering and Erosion could make a cave if the force is high enough, and it would be in the physical element because chemical is not entirely correct.