if a specimen takes up one quarter of the field of view (0.500 mm), what is the size of the specimen in micrometers (um)?
Answer:
Explanatio1 n/4*0.500*10^3=125
A population of 1000 birds exists on a small Pacific island. Some of the birds are yellow, a characteristic determined by a recessive allele. The others are green, a characteristic determined by a dominant allele. A hurricane on the island kills most of the birds from this population. Only ten remain, and those birds all have yellow feathers. Below are several statements about this hypothetical situation. Please write 1-6 and next to each number write T if true of Fif false.
1) Assuming that no new birds come to the island and no mutations occur, future generations of this population will contain both green and yellow birds.
2) Assuming that no new birds come to the island and no mutations occur, future generations of this population will contain only yellow birds.
3) This situation represents diversifying selection. 4)This situation represents directional selection.
Answer:
1) False
2) True
3) False
4) True
Explanation:
(3 and/or 4 may be wrong, but 1 and 2, i'm positive they aren't0
1 is false and 2 is true because recessive alleles x recessive alleles = reccessive alleles, and since yellow is recessive, and you have no green birds, there is no possibility of having green birds without at least one green bird parent.
(I hope that makes sense)
I believe 4 is true because Directional selection occurs when a single phenotype is favored, which is what happens here.
I'm not too sure about 3 though, sorry
Hope it helps!!
Based on the graph, which of these conclusions is correct? (2 points)
a
Heat is not added in portions BC and DE.
b
Heat is not added in portions AB and CD.
c
Change of state takes place in portions BC and DE.
d
Change of state takes place in portions AB and CD.
Answer:
The answer is "Option c".
Explanation:
Throughout the given question, Option c is acceptable which is based on the graph. The status of parts BC and DE are significantly changed because the temperature in the parts BC (0 degrees Celcius) & DE (100 degrees Celcius) is relatively stable to only the template would also have changed from ice and water into the vapor.
Which types of organisms typically reproduce by binary fission
Many prokaryotic organisms such as bacteria reproduce by the process of binary fission.
Compare the movement of oxygen and carbon dioxide across the cell membrane. (4 marks)
help pls answer in paragraph form :)
Answer:
Molecules naturally disperse from areas of higher concentration to lower concentration.
As oxygen-rich (and carbon dioxide-poor) blood travels by a cell the oxygen diffuses through the cell membrane to the area of lower concentration inside the cell. It can do this easily because the oxygen molecule (O2) is very small and has no charge or polarity. The oxygen is used up rapidly by mitochondria. This rapid consumption causes oxygen to constantly move into the cell from the blood.
The mitochondria creates carbon dioxide (CO2) as a waste product of cellular respiration (the process that makes energy for your body). Because the CO2 is of a higher concentration in the cell than in the blood passing by, this gas continually diffuses out of the cell. It too is small and uncharged so it can pass through cell membranes easily.
These movements require no energy (in the form of ATP) on behalf of the cell.
Explanation:
Select the correct characteristics of the action of an enzyme. Select all that apply. Multiple select question. Enzymes are typically much smaller than reactant substrates, and each reaction requires many enzymes to activate its chemical change. Enzymes are incredibly versatile, each catalyzing a huge number of biological reactions. An enzyme behaves like both a heterogeneous and a homogeneous catalyst. Enzymes are enormously efficient, much more so than synthetic catalysts.
Answer: Enzymes are incredibly versatile, each catalyzing a huge number of biological reactions.
An enzyme behaves like both a heterogeneous and a homogeneous catalyst.
Explanation:
Enzymes are the biological catalyst they speed up the rate of the reaction without being consumed in the reaction. It is versatile in terms of catalyzing huge number of biological reactions but every enzyme has a specificity for a reactant or substrate. An enzyme can work as both homogenous and heterogenous catalyst. Homogenous catalyst is the one which is similar in properties as that of the substrate and heterogenous catalyst is the one which is dissimilar in properties as that of the substrate.
The correct characteristics is that of the action of an enzyme, enzymes are enormously efficient, much more so than synthetic catalysts.
Uses of enzymesEnzymes are biological substances that has the ability to increase the rate of a chemical reaction without changing at the end of the reaction.
The features of an enzyme include:
They possess great catalytic power and a small amount can easily catalyze a chemical reaction.They speed up reactions but remain unchanged during the whole reaction.There are synthetic and biological enzymes. The biological enzymes are enormously efficient, much more so than synthetic catalysts because biological enzymes has more affinity for its substrate than the synthetic enzymes.
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what sex chromosome is carried by the egg?
Answer:
Y
Explanation:
A salmon is able to swim upstream in a river because of energy it obtains
directly from
Answer:
it obtains its energy directly from it's food
Explanation:
explain why in some families, all children are of the same sex
Answer:
Because their families have the same chromosomes{x for mother & x,y for father}.Answer:
the mother gives out automatically the x chromosome, and the father can either give an x or y chromosome. some men more often give out more of a certain chromosome. the chromosome the father gives determines the gender of baby. x is girl and y is boy
genetic engineering is widely used in the field of agriculture and medicine. justify the impact of genetic engineering on humans and the environment.
Answer:
Biotechnology is the use of biological techniques and engineered organisms to make products or plants and animals that have desired traits.
Explanation:
People have used biotechnology processes, such as selectively breeding animals and fermentation, for thousands of years. Late 19th and early 20th century discoveries of how microorganisms carry out commercially useful processes and how they cause disease led to the commercial production of vaccines and antibiotics. Improved methods for animal breeding have also resulted from these efforts. Scientists in the San Francisco Bay Area took a giant step forward with the discovery and development of recombinant DNA techniques in the 1970s. The field of biotechnology continues to accelerate with new discoveries and new applications expected to benefit the economy throughout the 21st century.
In its broadest definition, biotechnology is the application of biological techniques and engineered organisms to make products or modify plants and animals to carry desired traits. This definition also extends to the use of various human cells and other body parts to produce desirable products. Bioindustry refers to the cluster of companies that produce engineered biological products and their supporting businesses. Biotechnology refers to the use of the biological sciences (such as gene manipulation), often in combination with other sciences (such as materials sciences, nanotechnology, and computer software), to discover, evaluate and develop products for bioindustry. Biotechnology products have made it easier to detect and diagnose illnesses. Many of these new techniques are easier to use and some, such as pregnancy testing, can even be used at home. More than 400 clinical diagnostic devices using biotechnology products are in use today. The most important are screening techniques to protect the blood supply against contamination by AIDS and the hepatitis B and C viruses.
Applications of Genetic Engineering
Genetic engineering means the manipulation of organisms to make useful products and it has broad applications.
What are the waste products of alcoholic fermentation?
A. Ethanol and carbon dioxide
B. Lactate and oxygen
C. Glucose and water
D. Carbon dioxide and oxygen
(40 points!!!) (will mark brainliest if its right)
Answer:
ethanol and carbon dioxide :)
Explanation:
The correct option is A. Ethanol and carbon dioxide are the waste products of alcoholic fermentation.
What is alcoholic fermentation?A biological process called alcoholic fermentation, often known as ethanol fermentation, turns sugar into alcohol and carbon dioxide. Alcoholic fermentation is an anaerobic process since yeasts carry out this function and oxygen is not required.
The fermentation process produces heat, carbon dioxide, water, and alcohol as byproducts. In this instance, our attention is on the latter.
A biological process called alcoholic fermentation, often known as ethanol fermentation, turns sugar into alcohol and carbon dioxide. Alcoholic fermentation is an anaerobic process since yeasts carry out this function and oxygen is not required.
Therefore, The correct option is A. Ethanol and carbon dioxide are the waste products of alcoholic fermentation.
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Which of the following best describes a population?
Answer:
C
Explanation:
Population is the number of simular species in the area, so the land and fish don't count.
Part A
In the current system of classification, living organisms are classified into the taxonomic levels of kingdom,
phylum, class, order, family, genus, and species. Why is it important for all scientists to use the same
hierarchy of classification when describing newly discovered organisms?
Helpppppp!!!!
Which feature is an example of psychological adaptation?
Jane wants to test if strawberries that are kept cold will rot or stay edible. She places a strawberry in the refrigerator and records the date. What variable should be controlled?
Answer:
I think it is the time or the degree of the cooling ability of the refrigerator
A small number of birds arrive on an island from a neighboring larger island. About twice a year, one or two more birds from the neighboring island arrive. These new arrivals: Group of answer choices tend to speed up adaptation to new food plants speed up the process of speciation accelerate differentiation between the two populations tend to slow divergence of the two populations
Answer:
Hello. None of the answer options is correct, as the new arrivals delay adaptation to new food plants.
Explanation:
The arrival of new birds increases competition for food. This makes the birds that have just arrived have some difficulty in accessing food, as they will have to compete with the birds that are already on the island. This makes the novice birds look for food plants they already know, which delays their adaptation to feeding new plants they do not know.
What environmental condition contributed to the heat wave experienced in Europe and the thousands of deaths in France? a. polluted water b. sewage c. air pollution d. a and b
Answer: c. Air pollution
Explanation:
There was a heatwave in Europe during the early years of the 21st century that killed tens of thousands across the continent and thousands in France.
Air pollution was blamed for having made the situation worse because the pollutants in the air acted to prevent heat from escaping back into the atmosphere which led to increased heat on ground and therefore a heat wave.
Answer:
C
Explanation:
Yeast undergo anaerobic respiration (fermentation), where glucose is broken down into two (2) ATP and two (2) pyruvate. This pyruvate is then used to form what waste product?
The pyruvate is then used to form Ethanol [tex][C_2H_5OH][/tex] and Carbon dioxide [tex][CO2_][/tex].
What is Anaerobic respiration?Anaerobic respiration is defined as respiration using an electron acceptor other than molecular oxygen where oxygen is not the final electron acceptor, the process still uses the respiratory electron transport chain.
Anaerobic respiration is described as the process in which there is incomplete oxidation of glucose in the absence of oxygen which is commonly known as fermentation.
One type of fermentation is alcohol fermentation where the pyruvate is decarboxylated [tex](CO_2 leaves)[/tex] to form acetaldehyde. Hydrogen atoms from NADH+. H+ are then used to help convert acetaldehyde to ethanol. NAD+ results.
Thus, the pyruvate is then used to form Ethanol [tex][C_2H_5OH][/tex] and Carbon dioxide [tex][CO2_][/tex].
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The cells were kept in a dilute salt solution. They were then transferred to distilled
water.
Explain what will happen to each of these two cells when they are placed into distilled water.
When plant cells are placed in salt solution their appearance is different to when they are placed in distilled water. ... Therefore, water moves out of the cell across the partially permeable membrane by osmosis and the cell becomes flaccid as the cell membrane peels away from the cell wall
The student wants to see the cells at a greater magnification. Describe the steps that she should take.
Gradually turn the crude focus knob until you can see the cells. Turn the fine focus knob slowly until the cells are in focus and visible.
What is magnification?Magnification is the process of enlarging something's apparent size rather than its physical size.
This enlargement is measured by a calculated number known as "magnification." When this number is less than one, it refers to a size reduction, also known as minification or de-magnification.
The magnification of a compound microscope is the product of both lenses, so if the microscope has a 10x eyepiece and a 40x objective, the total magnification is 400x. Magnification is defined as the ratio of the image size to the object size.
The student should use the adjustment knobs to bring the sample back into focus after selecting the x40 or x10 objective lens.
Thus, these steps are necessary to see cell's magnification.
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What best describes the endocrine system
A. system of transport
B. network of hormone-producing glands the control actions of the organism
C. network of tissues that respond and send messages
D. it is the network of nerves that coordinate bodily functions
Answer:
B
Explanation:
I took bio last year
I point
Bactrian camels, drcanedarves, llamas, and alpacas are all members of the same taxonomic farníly, Camelidae. Members of this family all have two tores, no homes,
true canine teeth, and a split upper lip. The family Camelidae originated in North America. The physical features of animals in this family and the family's
goopraphical origin provide evidence that all these animals -
have slowly evolved to become herbivores
live in the same type of ecosystem
have a common ancestor
exchanged DNA at some point in the past
Answer:
Have a common ancestor
Explanation:
All of these animals share many distinct traits ,while being in many different areas of the world
reasons for deforestation ?
Answer:
mark as brainiest please
Explanation:
Agricultural Activities
mining
urbanisation
illegal longing
forest fires
Natural causes as hurricanes, fires, parasites and floods.
Uranium atoms are split to create a tremendous amount of energy in a _____ power plant. Help now i put you brainlest
Answer:
nuclear
Explanation:
uranium is used in nuclear powerplant
other powerplant don't use uranium, they use wood(biomass) , geothermal energy(geothermal) , and water(hydroelectric) .
Brainliest please
Containers of ice cream are sold by volume, not by weight. Some ice cream manufacturers pump air into the ice cream before packaging it. Why does this practice make the ice cream more expensive to the consumer?
Glucose is a molecule that can move across the cell membrane. If the
concentration of glucose is higher outside the cell than inside the cell, then
what will happen by the process of diffusion?
Yea so what do i do?
Answer:
The right answer is B. Glucose molecules will diffuse out of the cell
Explanation:
Diffusion refers to the natural tendency of a system to homogenize the concentrations of chemical species within it.
What is the work done when a force of 5 N is applied to a ball and it moves 80 m?
Answer:
400Joules
Explanation:
the total work done to be calculated is Force× Distance
:f×d=W
80×5=320J
HELP!!!! FAST!!!! 20 POINTS!!!! You are a traffic accident investigator. You have arrived at the scene of an accident. Two trucks of equal
mass (3,000 kg each) were involved in a rear-end accident at a stop sign. Here is what you know:
• Truck 1 started from rest at the top of a 22-meter hill and coasted toward the intersection.
.
Truck 2 was on a flat stretch of road at the bottom of the hill directly in front of Truck 1.
At the bottom of the hill, Truck 1 was going 20 m/s; Truck 2 was going 35 m/s.
.
There were no skid marks left by Truck 2. The collision occurred at the stop sign where Truck 2 had
stopped
• After the collision, both trucks moved together in the same direction at 10 m/s before slowly rolling
to a stop.
You must now push Truck 2, using 1,000 N of force, 8 meters off to the side of the road so no one
else gets hurt.
1. How much work was done to bring truck 2 to a stop? 2. If tuck 2 came to a stop In 15 seconds, how much power (in watts) did it take to stop truck 2 at the sign by applying force to the brakes? 3. What is the final combined momentum of the trucks right after the accident? 4. Assuming that there are no other no conservation forces involved, what impulse was given to each truck during the collision? A. Truck 1: B. Truck 2:
Answer:
1) Kinetic energy of the truck 1 is 600,000 joules.
Kinetic energy of the truck 2 is 1,837,500 joules.
2 a)Potential energy of truck 1 is 646,800 Joules.
b) Energy lose by the truck 1 just got converted into heat and sound energy during the collision.
Step-by-step explanation:
Mass of the truck 1 and truck 2,m = 3000 kg
Velocity of the truck 1, = = 20 m./s
Velocity of the truck 2, = 35 m./s
1. Kinetic energy of the truck 1:
Kinetic energy of the truck 2:
2.a) Energy loose by the truck 1:
Initial height of the truck on the hill = 22 m
At that height potential energy will be maximum:
Potential energy of truck 1 at that height =
b) Energy lost by the truck 1 just got converted into heat and sound energy during the collision.
help pls pls plsssss
Answer:
the evidence points to increase of carbon dioxide in the atmosphere. There are many reasons, but you could probably go with deforestation, unregulated emissions--burning fossil fuels, industry and transportation.
A- Briefly describe the biotechnology methods that would have been used to produce these results.
B- How are the bands from the jeans and the shirt similar? How are they different?
C- Based on these results, what conclusions might a prosecutor present to a jury during a criminal trial?
Answer:
a. teh use of a electrophoresis machine after the dna has been processed using enzymes would give the bands shown on the gel
b.the bands from teh jeans and shirt show that the shirt was made from materials taht include teh material the jeans were made from
c. a prosecutor may conclude to the jury that the defendant had blood only on their shirt