!PLEASE HELP ASAP! what is the half-life of the radioactive isotope? what mass of the radioactive isotope will be left after three(3) half-lives?
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Related Questions
Even though mutations are relatively rare, they are still a concern in bacteria populations. Why?
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Answer:
Mutations can provide resistance to antibiotics If we were to treat the bacterial population with that specific antibiotic, only the resistant bacteria will be able to multiply; the antibiotic selects for them. These bacteria can now increase in numbers and the end result is a population of mainly resistant bacteria.
Explanation:
Even though mutation is rare in bacteria, it is still important to be concerned about bacteria. The reason is that if any mutation happens that converts the bacteria into antibiotic-resistant bacteria, then this would be harmful.
What is mutation?Mutation is a phenomenon in which a change is seen in an organism's genome. It may be induced by chemical factors, environmental factors, etc. The mutation may be positive or negative.
In a population, evolution is seen due to mutation. It is one of the factors behind evolution. In bacteria, the mutation happens too. If any sort of mutation happens that makes them antibiotic-resistant, then it would be harmful for humans. Humans take antibiotics that destroy harmful bacteria. If these bacteria mutate their genetic constitution and become resistant, a higher dose of antibiotic will be required next time to destroy such harmful bacteria.
Hence, mutations in bacteria are harmful even though they are rare.
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3.When Watson and Crick built and proposed the DNA structure, they determined three important features.
What were the three features they proposed? Select all that apply.
Multiple select question.
A) Two outside strands consist of alternating deoxyribose and phosphate.
B) Two outside strands consist of alternating ribose and phosphate.
C) Guanine and cytosine bases pair to each other by two hydrogen bonds.
D) Guanine and cytosine bases pair to each other by three hydrogen bonds.
E) Guanine and adenine bases pair to each other by three hydrogen bonds.
F) Cytosine and thymine bases pair to each other by two hydrogen bonds.
G) Adenine and thymine bases pair to each other by three hydrogen bonds.
H) Adenine and thymine bases pair to each other by two hydrogen bonds.
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The backbone of DNA is deoxyribose and phosphate while RNA is composed of ribose and phosphate. C and G (curvy letters pair together) pair together with 3 hydrogen bonds while A and T pair together with 2 hydrogen bonds.
According to Watson and Crick, DNA replication used each strand's nucleotides as a template for new strands. Thus,option A, D, H is correct.
What is the Watson and Crick model about DNA?Watson-Crick DNA structure. The molecule of DNA is a double-stranded, helical structure. It consists of two sugar-phosphate backbones on the outside and nitrogenous base pairs on the inside, bound together by hydrogen bonds.
DNA behaves like a double helix made up of two protracted, intertwined helical strands.
In their model, the bases along one DNA strand matched the bases along the other DNA strand. Each DNA strand comprised discrete units known as bases.
Therefore, Watson and Crick built and proposed the DNA structure, which determined important features of DNA.
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The soil around a lilac bush was watered with a solution containing
radioactive phosphorus. Several hours later, radiation was detected in it’s
branches. Through which structures did the radioactive phosphorus read
the branches?
A. stomata
B. guard cells
C. xylem vessels
D. phloem vessels
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Answer:
I think its D
Explanation:
Which two phrases best describe vascular tissue in plants?
O A. Contain cells that connect to form pipes
B. Cover the outside of plants
O C. Transport water and food
O D. Contain root hair cells and guard cells
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Answer:
These 2 might be the best answers:
A. Contain cells that connect to form pipes
C. Transport water and food
An illustration of an organism and a dichotomous key are given. What is the organism?
1
2
a. More than 6 legs
b. 6 legs or less
a. Has wings
b. No wings
a. Single pair of wings
b. Two pair of wings
a. Wings are nearly equal size
b. Forewings larger than hindwings
Arachnid
Go to step 2
Go to step 3
Ant
Fruit fly
Go to step 4
Dragonfly
Mayfly
اسا
4
Arachnid
Ok
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Answer:
it's a dragon fly right?
how do genetics define the appearance of an organism?
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In cats, long tails are dominant over short tails. Cross one heterozygous
long-tailed cat with a short-tailed cat.
What is the chance there will be a short-tailed cat born?
75
25
50
О
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Answer:
I think the chance will be 50 for short tailed cat
The difference between community and biome is...
A. Environment is included in Biome
B. Biomes cover a certain square footage
C. Community is only one species
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Answer:
A is the answer to the question
Which of the following is NOT a benefit of using fracking?
A. It allows use of formerly trapped resources.
B. It uses fresh water which can become be polluted.
C. It has allowed countries like the US to become more energy independent.
D. It has increased the supply of energy resources.
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Why are piglets given solid feed six days after birth rather than right after birth?
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Answer:
milk
Explanation:
It is usually because they need milk for the protein and vitamins and other important stuff that they need to survive
A group of organisms that can reproduce to produce fertile offspring (babies that can reproduce).
A)Biosphere
B)Community
C)Population
D)Ecosystem
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Answer:
Población
Explanation:
Puesto que no se especifica que individuos realizan la acción podemos deducir que habla de los seres en general, así pues , de todas las definiciones creo que la población es la más acertada.
In humans (and other animals) where does glucose come from?
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Answer:
Glucose is a carbohydrate, and is the most important simple sugar in human metabolism. ... Glucose is one of the primary molecules which serve as energy sources for plants and animals. It is found in the sap of plants, and is found in the human bloodstream where it is referred to as "blood sugar"
Explanation:
ill give brainly pls help
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17. Energy stored in foods is
; digested food
releases
energy for movement and
energy as heat.
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/watch?v=DLzxrzFCyOs
Energy for movement and energy as heat
What does central dogma refer to?
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Answer:
The central dogma of molecular biology desrices the flow of genetic information in cells from DNA to messenger RNA to protien.
Explanation:
Which of the food below are fortified with Vitamin D which helps our body with
calcium absorption:
Dairy products like yogurt and Cheese
Whole grain breads
Healthy canned fruits and vegetables with no additives or sugars
Low fat meats like chicken and fish
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Answer:d
Explanation:
Answer:
Chicken and fish - is the answer
Explanation:
PLEASE HELP ME SOLVE THIS I BEG, BE KIND AND THE UNIVERSE WILL REWARD YOU, THE FILE IS BELLOW
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Answer:
Ee = Heterozygous
part 2:
TT = is able to roll tongue
Tt = is able to roll tongue
tt = is NOT able to roll tongue
HH = has mid finger hair
Hh = Has mid finger hair
hh = does not have mid finger hair
CC = has a cleft chin
Cc = has a cleft chin
cc = does not have a cleft chin
Part 3:
Widows peak = TT Tt
No widows peak = tt
No hitchhiker thumb = tt
Hitchhiker thumb = TT Tt
Explanation:
I cant answer the punnet square stuff, but just put the peas genotypes on the top and then the left of the punnet squares (there should only be two genotypes to put)
What are the effects of a set of alleles on an organisms health or appearance?
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begin by making a list of questions that will help you conduct your research
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Answer:
Explanation:
I don't see the equation
HELP ME
I NEED THIS FOR NOW
I WILL GIVE YOU BRAINLIEST
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Answer:
1) As soon as the paper cuts into the cells of your skin, your body springs into action. First, blood cells called platelets join together at the paper cut and form a clot to stop the bleeding.
The process is called Blood clotting.
2) The cell that are made will have the same same amount of DNA/chromosomes.
3) Chromosomes come in pairs. Normally, each cell in the human body has 23 pairs of chromosomes (46 total chromosomes). Half come from the mother; the other half come from the father. Two of the chromosomes (the X and the Y chromosome) determine your sex as male or female when you are born.
what is the function of the human skeleton
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Answer:
The skeletal system works as a support structure for your body. It gives the body its shape, allows movement, makes blood cells, provides protection for organs
Explanation:
Answer:
1. Support
That's about everything just covered above
2. Protection
They keep organs away from damage, such as the rib cage and the skull.
3. Movement
That's covered above, also.
4. Storage
The bone stores fat and some minerals.
5. Blood cell formation
The bone is the place that most of your blood components are made.
Explanation:
. When birds migrate into or out of a defined population and mate with birds from another
population, the existing pool of genes may be altered. Migration can increase or decrease gene
frequencies in populations, resulting in...
A. Greater genetic variation, which may enhance chances of survival
B. Less genetic variation, which will not influence chances of survival at all
C. Selective breeding, which may enhance chances of survival
D. Natural selection, which will not influence chances of survival at all
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Domain Eukarya divides into four kingdoms _____________, ______________, ______________, and _________________
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Describe the relationship between muscles, fascicles, muscle fibers, and myofibrils.
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Hope this helps :)
which phrase describes a plant spore but not a plant seed
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Answer:
the phase that describes a plant spore but not the plant seed is called meiosis
Answer:
Made of a single cell
Which is the best example of a response to an external stimulus?
A. drinking water after a long run
B. avoiding the sun by looking for food at night
C. a hungry bear hunting for food
D. falling asleep in the treetops of a forest
will mark brainiest
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Answer:
B
Explanation:
I'm not 100% sure.... but that one is the only choice I would pick
Answer:
A
Explanation:
1. What is a lunar eclipse? *
5 points
a. when the moon is completely dark
b. when the side of the moon that faces the sun is illuminated and the other side is
completely dark
C. when the side of the moon that faces the sun is completely dark and the other side
is illuminated
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Answer:
a lunar eclipse is when the sun and the moon align in the same place in FROUNT of earth
Answer:
An eclipse of the Moon (or lunar eclipse) can only occur at Full Moon, and only if the Moon passes through some portion of Earth's shadow.
Explanation:
Proteins are formed in the cytoplasm of cells using genetic instructions from DNA, which is located in the cell’s nucleus. Which of the following best explains how the genetic information gets to the site of protein synthesis?
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Answer:
I dont know
Explanation:
A container holds an element and a compound that are not chemically combined. Is this an element, a mixture or a compound?
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Answer:
Mixture.
Explanation:
Mixture can be defined as a combination of two or more substances which are present in varied proportion and can be visibly seen by with our naked eyes.
In Science, there are two (2) main types of mixture and these are;
I. A homogeneous mixture: it can be defined as any liquid, solid or gaseous mixture which has an identical or uniform composition and properties throughout any given sample of the mixture. In Chemistry, all solutions are considered to be a homogeneous mixture. For example, aqueous hydrogen chloride is a homogeneous mixture of water and hydrogen chloride.
This ultimately implies that, in a homogeneous mixture, the different parts are uniformly (evenly) distributed.
II. A heterogenous mixture: it can be defined as any mixture which has a different or non-uniform composition and properties throughout any given sample of the mixture. This ultimately implies that, the constituents of a heterogenous mixture always remain separate in the sample and as such comprises of two or more phases.
For example, a mixture of sand and coffee is simply a heterogenous mixture and can easily be separated into their various components.
In this scenario, a container holds an element and a compound that are not chemically combined. Thus, this is a mixture.
how aquatic animals and plants adapt to live in water