Answer:
cork cells
Explanation:
A cork cell has a cell wall that has a waxy substance that is impermeable to gases and water called suberin.
How might the production of antibiotics and odours have evolved?
Answer:
Antibiotic resistance evolves naturally via natural selection through random mutation, but it could also be engineered by applying an evolutionary stress on a population. Once such a gene is generated, bacteria can then transfer the genetic information in a horizontal fashion (between individuals) by plasmid exchange
The Offspring produced by a cross between two given types of plants can be any of the three genotypes denoted by A, B, and C. A theoretical model of any of the three genotypes denoted by A, B, and C should be in the ratio 1:2:1. For experimental verification, 100 plants are bred by crossing the two given types. Their genetic classifications are recorded. Do these data contradict the genetic model
Complete question:
The offspring produced between two given types of plants can be any of the three genotypes, denoted by A, B and C. A theoretical model of gene inheritance suggests that the offspring of types A, B and C should be in a 1:2:1 ratio (meaning 25% A, 50% B, and 25% C). For experimental verification, 100 plants are bred by crossing the two given types. Their genetic classifications are recorded in the table below.
Genotype Observed frequency
A → 18 individuals
B → 55 individuals
C → 27 individuals
Do these contradict the genetic model?
Use a 0.05 level of significance.
Determine the chi-square test statistic.
Answer:
Do these contradict the genetic model? No, according to the chi-square test, there is not enough evidence to reject the null hypothesis of the population being in equilibrium.
Explanation:
Available data:
Crossed genotypes: twoGenotypes among the offspring; Three → A, B, and CExpected phenotypic ratio → 1:2:1Total number of individuals, N = 100A = 18 individualsB = 55 individualsC = 27 individualsSo, let us first state the hypothesis:
H₀= the population is equilibrium for this locus → F(A) = 25%, F(B) = 50%, F(C) = 25% H₁ = the population is not in equilibriumNow, let us calculate the number of expected individuals, according to their expected ratio.
4 -------------- 100% -------------100 individuals
1 --------------- 25% -------------X = 25 individuals A
2 -------------- 50% -------------X = 50 individuals B
1----------------- 25%--------------X = 25 individuals C
A B C
Observed 18 55 27 Expected 25 50 25 (Obs-Exp)²/Exp 1.96 0.5 0.16(Obs-Exp)²/Exp
A) (18 - 25)²/25 = 49/25 = 1.96
B) (55 - 50)² / 50 = 25/50 = 0.5
C) (27 - 25)²/25 = 4/25 = 0.16
Chi square = X² = Σ(Obs-Exp)²/Exp
∑ is the sum of the terms O are the Observed individuals: 2 in chamber B, and 18 in chamber A. E are the Expected individuals: 10 in each chamberX² = ∑ ((O-E)²/E) = 1.96 + 0.5 + 0.16 = 2.62
Freedom degrees = 2
Significance level, 5% = 0.05
Table value/Critical value = 5.99
X² < Critical value
2.62 < 5.99
These results suggest that there is not enough evidence to reject the null hypothesis. We can assume that the locus under study in this population is in equilibrium H-W.
Where do majority of tornadoes occur in the United States?
Answer:
central united states
Explanation:
mainly in this area because of cold air coming in from canada and warmer air coming from the gulf of mexico meeting and causing tornados.
Answer:
A majority of tornadoes that occur in the United States, occur in the Midwest and Southeast region of the United States.
Explanation:
Tornadoes can impact just about every U.S. state, but the majority of these storms are concentrated in states throughout the Midwest and Southeast. In fact, of the average 1,137 tornadoes that occur in the United States each year, 64% of them form in states located in “Tornado Alley” and “Dixie Alley”, two regions with a disproportionately high frequency of tornadoes due to atmospheric conditions that persist for long stretches of the year.
With an average of 140 tornadoes annually, Texas is the most tornado-prone state in the U.S., followed by Kansas with 80 and Florida with 59, according to National Oceanic and Atmospheric Administration data.
Top five states with the most tornadoes
Texas - 140
Kansas - 80
Florida - 59
Oklahoma - 56
Nebraska - 54
Bottom five states with the least tornadoes
Alaska - 0
Hawaii - 0
Rhode Island - 0
Delaware - 1
Idaho - 1
What basic substances make up a cell
Answer:
The main ingredient of cells is water. Water is needed to maintain homeostasis. Cells are also made up of macromolecules—nucleic acids, lipids, proteins, carbohydrates. These macromolecules help maintain a cell's structure, help cells communicate with each other, aid in energy storage, etc.
Answer:
Water
Explanation:
Which of the following is a 5-carbon sugar?
Glucose
Fructose
Ribose
Sucrose
Answer:
ribose
Explanation:
Answer:
Ribose & deoxyribose sugars. Ribose is a single-ring pentose [5-Carbon] sugar.
1. After you remove the water, all lite is made up mostly of carbon?
Answer:
There are other elements that are fundamental to life.
Explanation:
Carbon is fundamental to life although water is also important to life. You could argue that all life would be made mostly of carbon if you remove all the water though.
Biology please help me
1) b
2) c
3) d
4) c
5) b
6) a
7) b
8) a
9) a
10)c
Answer:
1. b 2.c 3.d 4.c 5.b 6.a 7.b 8.c 9.a 10.c
Explanation:
not the most certain on 9 and 10 sorrym
PLEASE HELP!! Only one of the following statements is true: Identify the true statement and explain why it is true.
a. Two organisms can be of different phylums but the same kingdom.
b. Two organisms can be of different kingdoms but the same phylum.
is this correct please dont randomly answer. but answer if u know
Answer:
dark colored forest with dark bark
Explanation:
since the population has gone down it shows the moths cannot blend in with their environment
Why do scientists believe that some tectonic plates are moving away from each other?
Explain how the discoveries by Rosalind Franklin helped Watson and Crick build an accurate model of DNA.How can DNA be used to help solve a crime?
Answer:
Rosalind Franklin had taken the first picture showing the structure of DNA, called the double helix. This helped confirm what Watson and Crick had thought, thus leading them to make the first accurate model. DNA can be used to solve a crime because it can prove a certain person did something. EX: finding hair and who it belongs to/ finding finger prints and who they belong to.
hope this helps!
Indicate true or false for each statement by writing the words true or false in the blanks. Certain plants contain compounds similar to ecdysone which serve as a defense against insects. Juvenile hormone levels are high in insect larvae, but must decrease in order for metamorphosis to occur. Chemicals similar to ecdysone and juvenile hormone are widely used commercially to control insect pests
Answer:
Certain plants contain compounds similar to ecdysone which serve as a defense against insects. False
Juvenile hormone levels are high in insect larvae, but must decrease in order for metamorphosis to occur. True.
Chemicals similar to ecdysone and juvenile hormone are widely used commercially to control insect pests. True
Explanation:
The plants produce toxic chemicals such as terpenoids, alkaloids, anthocyanins, phenols, and quinones as a defense against insects. Juvenile hormone levels are high in insect larvae but its concentration decrease when the insect transform into adult stage and in order to occur metamorphosis. Ecdysone and juvenile hormone are widely used as insecticide because it prevents the insects to transform from larva to adult so if they can't mature they can't harm the plants or other things of our environment.
Which of the following best describes what causes plasma cells to form during a humoral immune response?
a. Memory B cells signal phagocytes to attack infected cells and divide, producing plasma cells.
b. Memory T cells recognize antigens and signal T lymphocytes to divide, producing plasma cells.
c. The antibodies on the surface of B cells bind to antigens, and the B cells grow and divide, producing plasma cells
d. The antigens on the surface of a pathogen attack healthy cells, and the resulting inflammation signals helper T cells to divide, producing plasma cells.
Answer:
Explanation:
Answer:
C. The antibodies on the surface of B cells bind to antigens, and the B cells grow and divide, producing plasma cells.
Explanation:
I took the test
What is the name of the process that results in a karyotype like the one pictured?
O A. Nondisjunction
O B. Crossing over
O C. Gene mutation
O D. Mitosis
HELP SAMA PLZZ
Answer:
THIS IS CROSSING OVER- DNDNNFNCBXJXBDJBXJX WHY DO YOU HAVE SUCH HARD QUESTIONS-
74. As layer upon layer of sediments are deposited, the process of the presses them
together.
Answer:
GO GET BOY
Explanation:
What is the relationship between UV radiation and melanin
Umami is one of the taste types that humans can recognize. Which selections below describes the taste of umami? savoriness, brothy, meaty salty sweet bitter
Answer:
a. savoury...........
Option A) savoriness, brothy, meaty
The levels of organization in living things are cell, tissue, organ,
and organs-system. What level of organization is each layer - the
epidermis, palisade layer, spongy layer? __ . The entire
leaf would then be considered to be a__.
HELP PLEASE!!!
Answer:
An ion with a -2 charge, atomic number 17, an atomic mass of 25 has how many electrons?
Explanation:
a heterozygous chicken with black feathers mates with a white chicken whats the possiblility the offspring will be black
Answer:
if black feathers are the recessive gene than there is a 0% of black feathers and if its dominate than there is a 100% chance of black feathers
Explanation:
b b
w bw bw
w bw bw
When the offspring's phenotype is a "combination" (mixture) of parents' phenotypes
A) Punnett square
B) Polygenic inheritance
C) Codominance
D) Incomplete dominance
Answer: C) Codominance
Explanation:
When the offsprings phenotype is a combination of both parents
Answer:
I think the answer is incomplete dominance!! my teacher just explained it
Explanation:
6. Parts per million is used to express the A) atomic mass of an element B) concentration of a solution C) volume of a substance D) rate of heat transfer A B
Please select the word from the list that best fits the definition
Grouping items together to keep observations organized
inferring
predicting
classifying
observing
Answer:
classifying
Explanation:
for example like classifying the files from SVU classifying them keeps them more organized and labeled kind of like identifying them classifying them keeps them all together in one group
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Paar
ALGALEHEEN BILINGUAL SCHOOL
Grade 1 Science Homework #3.7
Topic 5.Lesson 4 Where plants and
animals live.
1.
A. True or false .
x
The environment is everything around a living thing
.
.
Answer:
Explanation:
A habitat is a special place where a plant or animal lives
Answer:
True
Explanation:
Help please!! Louisa wants to find out whether earthworms prefer to live in the dark or in the light. She constructs an investigation. She fills a box with dirt and places 30 earthworms in the dirt. Then, she covers half of the box with a lid. She leaves the other half open. After waiting a week, what should Louisa do next? No links!!!
A. repeat the experiment
B. write a report to present to her science class
C. ask another question about the behavior of earthworms
D. count the number of earthworms that are present on each side of the box
Answer:
A is the answer because she have to answer again to make sure it is right
HELP. This is due in a bit. Giving Brainliest!!
What term means removing the nucleus from a cell?
A.enucleation
B.disnucleation
C. nuclear fission
D. nuclear proliferation
Now that you have mapped some of the morphological characters on the evolutionary relationships, you should notice conflicts with regard to these characters defining some clades. What other types of evidence do you think scientists used to support this particular phylogeny, assuming the above phylogeny is correct
Answer:
is a phylogenetic tree for all nine animal phyla that you studied ... Now that you have mapped some of the morphological characters on the ... you should notice conflicts with regard to these characters defining some clades. What other types of evidence do you think scientists used to support this particular ...Explanation: Similar to detective work, scientists must use evidence to uncover the facts. In the case of phylogeny, evolutionary investigations focus on two types of evidence: morphologic (form and function) and genetic. Hope It Helps Here For Your Help
Which of the following pieces of evidence does not explain how mid-ocean ridges are formed?
A. The rocks closer to the ridge are younger than those farther away.
B. Mid-ocean ridges are found on the bottom of most oceans.
C. The magnetic orientation of rocks is symmetrical on either side of mid-ocean ridges.
D. Pictures of ridges show evidence of lava flows.
Answer:
B
Explanation:
i am sorry if this is wrong
The following pieces of evidence does not mid-ocean ridges are formed Mid-ocean ridges are found on the bottom of most oceans.
What is mid-ocean ridges?The central parts of the oceans have mid-ocean ridges. The mid-ocean ridges are volcanic underwater mountain ranges.
There is constant propelling of magma, and as the magma cools off quickly it creates new crust.
This results in the mid-ocean ridges gaining heights of up to 1.5 km above the surrounding area.
So, option B is correct.
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Which step occurs in meiosis to prepare for fertilization in sexually
reproducing organisms?
Answer: 12 sexual reproduction and meiosis concept outline
Explanation: The process of meiosis produces unique reproductive cells called gametes, which have half the number of chromosomes as the parent cell. Fertilization, the fusion of haploid gametes from two individuals, restores the diploid condition. Thus, sexually-reproducing organisms alternate between haploid and diploid stages.
Hope this helps :D
What is an example of an event that can compromise an ecosystem?
1.seasonal climate change
2.seasonal dry period
3.d eveloping land around cities
4.high temperatures
Answer:
seasonal climate change
Explanation:
based on the climate can vary whether or not the animal can adpat to live in that ecosystem. take polar bears for example. scientists say that polar bears won't be able to adapt to climate change bc it's changing so quickly.
hope this helps! have a fantastic day/night
An example of an event that can compromise an ecosystem is seasonal climate change.
What is an ecosystem?An ecosystem is a place where all animals and plants, biotic and abiotic factors live together interdependent to each other.
There are different types of ecosystem:
Terrestrial ecosystemOcean ecosystemDesert ecosystemThus, the correct option is 1. Seasonal climate change.
Learn more about ecosystem
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