Answer:
True,Every chemical reaction obeys the law of conservation of mass.
AZT is a drug that is commonly used to fight HIV infection. The active component of AZT is a nitrogenous base that mimics thymine. Normal nucleotides CANNOT covalently bond to the thymine mimic. HIV's reverse transcriptase enzyme will use the thymine mimic instead of using thymine, whereas our DNA polymerase will not make this mistake. What is the most likely explanation for how AZT prevents HIV replication
AZT works by selectively inhibiting HIV's reverse transcriptase, the enzyme that the virus uses to make a DNA copy of its RNA. Reverse transcription is necessary for production of HIV's double-stranded DNA, which would be subsequently integrated into the genetic material of the infected cell to produce its proteins. All reverse transcriptase inhibitors are analogues of the naturally occurring deoxynucleotides needed to synthesize the viral DNA and they compete with the natural deoxynucleotides for incorporation into the growing viral DNA chain.
Which of these events would lead to an INCREASE in the size of a population of squirrels?
A. More squirrels are born that die
B. Some squirrels emigrate to a different ecosystem in search of food
C. New predators are added to the ecosystem
D. A large number of squirrels die because of a forest fire
Answer:
A
Explanation:
the answer cannot be D, since dying decreases the population. And it cannoy be c because if new predators are added, there might be others who will eat the squirrels. and b doesnt mean a decreasion or increason. so its neutral. therefor the answer is A
What is true about the evolutionary relationships between groups of animals on a phylogenetic tree?
a. The closer animals are located on a tree, the more characteristics they share.
b. Animals on a tree are related only if they are on the same branch of the tree.
c. Only the animals close to the bottom of the tree share a common ancestor.
d. The further apart animals are on a tree, the more closely they are related.
Answer:
The closer animals are located on a tree, the more characteristics they share.
Explanation:
The pattern of branching in a phylogenetic tree reflects how species or other groups evolved from a series of common ancestors. In trees, two species are more related if they have a more recent common ancestor and less related if they have a less recent common ancestor.
Which are examples of pathogens? (Choose all that apply)
Parasite
Virus
Plants
Water
Fungi
Bacteria
Poop
Answer:
virus
bacteria
fungi
poop
Explanation:
1. Which are the two important roles of the atmosphere?
. The number and type of prey items found in the owl pellet can be the result of the following factors: availability and abundance of prey, the ease or difficulty of catching the prey, and the taste preference of the owl. Create an experimental design that would describe the diets of barn owls while accounting for these factors.
Explanation:
Experimental design based on the factors mentioned
Check for availability of prey in same habitat as the Barn owl
Determine the type of prey available in the habitat because Owls feed mostly on small rodents like mice, vole e.t.c
If there is an abundance of prey, Check for the most common and easy to catch prey for an owl . considering the taste of the Barn owls while carrying out this experiment .
The Barn Owls feed mostly on Field voles to other kinds of rodents. therefore the availability and ease of catching a Field vole should be prioritized if they are readily available in the same habitat with the Barn Owls. if Field voles are not available the Barn owls can also feed on other rodents and smaller birds available .
Conclude your experiment
The diets of barn owls depend on the availability and abundance of prey, the energy requires to catch the specific prey, and taste preference based on its behavior.
What do you mean by Prey?Prey may be defined as an animal or any other organism that is hunted or killed by another animal for the purpose of food.
Barn owl decides its food on the basis of availability and abundance of prey because in order to survive barn owl checks the presence of a particular prey that are easily available and found in high number. Mostly barn owl prefers small species of rodents like mice, young one of rabbit, and sometimes birds.
Other than this it also depends on how much energy is required to catch the particular prey because if the energy is greater than that of benefit, barn owls eliminate this behavior.
And last barn owls choose those prey that is palatable in nature and have good taste. Bad taste or toxic taste is eliminated in nature.
Therefore, the diets of barn owls depend on the availability and abundance of prey, the energy requires to catch the specific prey, and taste preference based on its behavior.
To learn more about Foraging behavior, refer to the link:
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. Describe it in your own words
Answer:
the cycle of the re-growth and how nitrogen affects the elements around us
Explanation: I really just wanted to know if this would help you. hope it did.
Based on the context in paragraph 4, fossil refers to ____________.
a. how igneous rocks were formed over time
b. a trace or print, or the remains of a plant or animal of a past age preserved in Earth or rock
c. layers of sediment building up over time and pressing down, forming rock
4. Sedimentary rock is the second category. These rocks cover most of Earth’s land. Sedimentary rocks are made of pieces of other rocks and shells. Erosion causes rocks to slowly wear away. Erosion can be caused by rain, wind, freezing, and plant roots. Sometimes small pieces of rock are made because of erosion. The small pieces of rock are called sediment. Rivers take sediment to oceans and lakes. The river drops the sediments as it slows down. The sediments settle to the bottom in layers. More and more layers of sediment are dropped over millions of years. The weight from the top layers turns the bottom layers of sediments into rock. This makes some sedimentary rocks look layered. Fossils are often found in sedimentary rocks.
Answer:
b. a trace or print, or the remains of a plant or animal of a past age preserved in Earth or rock
Explanation:
Fossils are remains or prints of extinct species that are slowly filled in with sediment over time.
Detrimen WHY the following statement can occur in DNA ?
a. the sequence -A-C-C-T-C-G- may be present in the DNA molecule
c. the ratio A: T and C: G is the same in the DNA molecule
e. the sequence -C-G-U-A-A-G-may be present in the mRNA molecule
f. the sequence -T-G-C-A-C-U- can not occur in the RNA molecule
How can I answer this question ?
Thanks allllllot
Answer:
c
Explanation:
I don't know about other but adenine is with tyamine and guanine with cyanine
Which characteristic do jawless fish and cartilaginous fish have in common?
jaws
scales
skeleton of cartilage
tube-shaped body
Answer:
C. skeleton of cartilage
Explanation:
i got it right on edge
Comprehension Questions: Answer all the following questions in complete sentences!
Population Density
1. A population of 140 earthworms live in an area of 4
m2, what is the population density?
D=???
D= ???
I
I
D= ???
Answer:
density =population size/area of habitat
Explanation:
density =140 earthworms/4m²
=35 earthworms/m²
A man who carries an allele of an X-linked gene will pass it on to
Explanation:
A man passes on his Y chromosome to all of his sons and his X chromosome to all of his daughters. Therefore, the sons of a man with an X-linked dominant disorder will not be affected, but all of his daughters will inherit the condition. A woman passes on one or the other of her X chromosomes to each child.
What are the 3
environmental stresses?
Give examples for each of
the stressors
Which is not a characteristic of homologous chromosomes?
A. same length
B. same centromere positon
C. exact same type of alleles
D. same genes
Answer:
C. exact same type of alleles
!.A cladogram is...
A. A two-word scientific name consisting of the organism's genus and species names.
B. An ordered system to classify organisms
C. A branching diagram that shows patterns of shared characteristics within organisms
D. The evolutionary development of a species
please help
I will give brainliest and five stars ane 19 points for the best answer
Answer:
hi
Explanation:
A cladogram (from Greek clados "branch" and gramma "character") is a diagram used in cladistics to show relations among organisms. ... These branching off points represent a hypothetical ancestor (not an actual entity) which can be inferred to exhibit the traits shared among the terminal taxa above it.
DOES IT HELP?!
meaning of epidemic virus pandemic
A pandemic is defined as “an epidemic occurring worldwide, or over a very wide area, crossing international boundaries and usually affecting a large number of people”. The classical definition includes nothing about population immunity, virology or disease severity.
By this definition, pandemics can be said to occur annually in each of the temperate southern and northern hemispheres, given that seasonal epidemics cross international boundaries and affect a large number of people. However, seasonal epidemics are not considered pandemics.
Answer:
The meaning of this answer is...
AN EPIDEMIC is a disease that affects a large number of people within a community, population, or region. A PANDEMIC is an epidemic that's spread over multiple countries or continents.
Why is cigaratte smoking injurious to health ?
Name the enzyme which is present in infants but may be absent in adults.
Explanation:
cigaratte smoking is injurious to health because it affects our lungs,heart and different internal organs of our body which is cause of cancer and other non curable diseases.
Answer:
During smoking the cigarettes fumes make the walls alveoli very thin which causes rupturing of alveoli. This reduces the surface area for gaseous exchange in lungs .
To make up for the reduces gaseous exchange the heart has to pump more blood.
г
Question 7 of 10
Which molecule is a product of photosynthesis?
O A. Sugar
B. Nitrogen
O C. Carbon dioxide
D. Water
What does Darwin's theory of evolution suggest?
species change over time
different species can interbreed
extinct species are not related
to living species
animals that look alike are most closely related
Answer:
a.
Explanation:
For more than a decade, Greenland has been losing about 600 trillion pounds of ice per year. The change in the distribution of weight on Earth changes how Earth wobbles on its axis. How can a change in Earth's wobble affect Earth's climate ?
A. Wobbling away from the sun can cool down regions.
B. Wobbling in the direction of the sun can cause large ice sheets to form
C. Wobbling away from the sun can cause polar ice caps to melt.
D. Wobbling in the direction of the sun can cool down regions .
The cholesterol associated with membranes
- helps stabilize the membrane at body temperature
- is attached to proteins and extends into the environment surrounding the cell
- both a and c
- is an abnormality resulting from a diet high in cholesterol
Answer:
b) It interferes with the movements of the fatty acid tails of the phospholipids.
Explanation:
Cholesterol has many important functions, including its role in membrane permeability, especially the cell membrane, and its role in metabolism. Cholesterol reduces the permeability of lipid membranes. ... Cholesterol helps to restrict the passage of molecules by increasing the packing of phospholipids. Steroid molecule that makes membranes more fluid at low temps and more ordered at high temps.
- Flat, rigid, carbon rings interfere with the movement of phospholipids.
- Smaller and less amphipathic lipid that is only found in animals.
- Sandwiched between fatty acid tails of phospholipids.
Which of the following is NOT one of the key characteristics of a well-designed test?
A) standardization
B) reliability
C) validity
D) brevity
Answer:
D) brevity
Explanation:
A test can be defined as an examination or quiz given to a student (pupil) during an academic calendar in order to measure or determine his or her intelligence. It is usually graded based on a set of defined grades or scores.
The key characteristics of a well-designed test includes the following;
I. Standardization: it is important that test is set based on certain criteria and acceptable rules within the education community and curriculum.
II. Reliability: the questions contained in a test should be credible and backed by correct answers.
III. Validity: the test questions should be genuine and authentic across board.
However, brevity simply means succinctness or conciseness i.e the test should be brief and very short in duration.
what's a ripple effect
Answer:
You know when a droplet falls into the water and then the water removes that looks like its making O's around where the droplet has fallen? Thats what ripple is.
Explanation:
Now if youre talking about the ripple effect similar to mental health here what it is:
The ripple effect is often used colloquially to mean a multiplier in macroeconomics. For example, an individual's reduction in spending reduces the incomes of others and their ability to spend.
The chart below shows the inferred evolution of some dinosaurs during three time periods in Earth’s history.
Which dinosaur most likely evolved from Coelophysis?Immersive Reader
(5 Points)
Camptosaurus
Triceratops
Theodont
Tyrannosaurus
Answer:
camptosaurus
Explanation:
I think it's correct
The Dinosaur that most likely evolved from Coelophysis is known as Camptosaurus. Thus, the correct option for this question is A.
What is Evolution?Evolution may be characterized as the complete methodology of gradual change that takes place over many generations, during which species of animals, plants, or insects slowly change some of their physical characteristics.
Coelophysis lived during the late Triassic period some 216.5 to 203.6 million years ago. Researchers believe that this small theropod lived on river floodplains where it walked alongside crocodilian-like Camptosaurus. They were small theropod dinosaurs that lived in what is now North America and Southern Africa during the late Triassic.
Therefore, the Dinosaur that most likely evolved from Coelophysis is known as Camptosaurus. Thus, the correct option for this question is A.
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A_____slide has an indentation in the center to hold the specimen , which is advantageous for larger specimen.
A. Coversilp.
B. Depressio.
C. Wet mount
Answer:
B
Explanation:
Answer:
B depressio
Explanation:
What is the significance of pepsin in this experiment? (Why is it included?)
Question 2 options:
Pepsin is an enzyme, it breaks the bonds within proteins.
Pepsin is an acid, it will dissolve anything.
Pepsin is a basic substance, it will dissolve anything.
Pepsin is the protein we are studying.
al 1
Explanation:
esuna ustancia rompe los enlacs
A DNA molecule carries information that specifies some traits of an organism. This information is found in the-
ОООО
shape of the molecule that is known as a double helix
order of nitrogenous bases in a single strand of nucleotides
number of different kinds of nucleotides in the molecule
kinds of nitrogenous bases that form complementary nucleotide pairs
Answer: The fourth answer
Explanation: The alternating sequence of complementary bases is what determines traits found in organisms
In DNA molecule, the information is found in kinds of nitrogenous bases that form complementary nucleotide pairs.
What are the functions of DNA?Deoxyribonucleic acid (DNA) is an organic chemical that contains genetic information and instructions for protein synthesis. It is found in most cells of every organism.
DNA contains the instructions needed for an organism to develop, survive and reproduce. To carry out these functions, DNA sequences must be converted into messages that can be used to produce proteins.
DNA is made of nucleotides. A nucleotide has two components: a backbone, made from the sugar deoxyribose and phosphate groups, and nitrogenous bases, known as cytosine, thymine, adenine, and guanine.
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Chickens that carry both the alleles for rose comb (R) and pea comb (P) have walnut combs, whereas chickens that lack both of these alleles (that is, rr pp) have single combs. From the information about interactions between these two genes, determine the phenotypes and proportions expected from the following crosses:
a. RR Pp × rr Pp;
b. rr PP × Rr Pp;
c. Rr Pp × Rr pp;
d. Rr pp × rr pp
Answer:
Explanation:
Available data:
There are two diallelic genes that code for chickens combDominant alleles R and P express rose comb and pea comb, respectivelyWhen they are together in a genotype, they express walnut combs, R-P-Recessive alleles are r and pGenotypes with only recessive alleles express single combs, rrppSo, genotypes and phenotypes would be like
Walnut combs, RRPP, RrPP, RRPp, RrPp (One dominant allele of each gene)Rose comb, RRpp or Rrpp (only R gene with dominant allele)Pea comb, rrPP or rrPp (Only P gene with dominant allele)Single combs, rrpp (no dominant alleles at all)a) Cross: RR Pp × rr Pp
Phenotypes: Walnut x Pea
Gametes) RP, Rp, RP, Rp
rP, rp, rP, rp
Punnett square) RP RP Rp Rp
rP RrPP RrPP RrPp RrPp
rP RrPP RrPP RrPp RrPp
rp RrPp RrPp Rrpp Rrpp
rp RrPp RrPp Rrpp Rrpp
F1) 12/16 = 3/4 R-P-, Walnut-combed animals
4/16 = 1/4 Rrpp, Rose-combed animals
b. Cross: rr PP × Rr Pp
Phenotype: Pea x Walnut
Gametes: rP, rP, rP, rP
RP, Rp, rP, rp
Punnett square) RP rP Rp rp
rP RrPP rrPP RrPp rrPp
rP RrPP rrPP RrPp rrPp
rP RrPP rrPP RrPp rrPp
rP RrPP rrPP RrPp rrPp
F1) 4/16 = 1/4 = 25% RrPP, Walnut-combed animals
4/16 = 1/4 = 25% rrPP, Pea-combed animals
4/16 = 1/4 = 25% RrPp, Walnut-combed animals
4/16 = 1/4 = 25% rrPp, Pea-combed animals
1/2 = 50% Walnut-combed animals, R-P-
1/2 = 50% Pea-combed animals, rrP-
c. Cross: Rr Pp × Rr pp
Phenotype: Walnut x Rose
Gametes: RP, Rp, rP, rp
Rp, rp, Rp, rp
Punnett square) RP Rp rP rp
Rp RRPp RRpp RrPp Rrpp
Rp RRPp RRpp RrPp Rrpp
rp RrPp Rrpp rrPp rrpp
rp RrPp Rrpp rrPp rrpp
F1) 2/16 = 1/8 RRPp, walnut
2/16 = 1/8 RRpp, Rose
4/16 = 2/8 RrPp, Walnut
4/16 = 2/8 Rrpp, Rose
2/16 = 1/8 rrPp, Pea
2/16 = 1/8 rrpp, single
6/16 = 3/8 walnut, R-P-
6/16 = 3/8 rose, R-pp
2/16 = 1/8 Pea, rrP-
2/16 = 1/8 Single, rrpp
d. Cross: Rr pp × rr pp
Phenotype: Rose x Single
Gametes) Rp, rp, Rp, rp
rp, rp, rp, rp
Punnett square) Rp Rp rp rp
rp Rrpp Rrpp rrpp rrpp
rp Rrpp Rrpp rrpp rrpp
rp Rrpp Rrpp rrpp rrpp
rp Rrpp Rrpp rrpp rrpp
F1) 8/16 = 1/2 = 50% Rrpp, Rose-combed animals
8/16 = 1/2 = 50% rrpp, single-combed animals
how do Solids, liquids and gasses change states?
you melt a solid to turn into a liquid, then you boil the liquid to turn it into gas
What happens to oxygen that is produced during photosynthesis?
a. It is used by plants to carry out photosynthesis.
b. It is used by all organisms to carry out photosynthesis.
It is used by all organisms to carry out cellular respiration.
d. It is used only by plants to carry out cellular respiration.
C.