Answer:
49 percent
Explanation:
I got this question correct on the quiz.
What are the two major purposes for mitosis?
. Carbon-14 is used to determine the time an organism was living. The amount of carbon-14 an organism has is constant with the atmosphere, but when an organism dies the carbon-14 decays at a half-life of 5,730 years. If an archeologist measured the amount of carbon-14 in an organism and it was 25% of the total amount of atmospheric C-14, what is the age of the organism?
The answer is 11460 years
What role do microtubules play during mitosis?
A. microtubules line up chromosomes at the equator of the cell during metaphase
B. microtubules play a role in the disassemble and reassembly of the nuclear membrane
C. microtubules play a role in the formation of the cell plate when plant cells undergo cell division
D. microtubules play a role in the migration of chromosomes to opposite ends of a dividing cell during anaphase
Answer:
Microtubules play a role in the migration of chromosomes to opposite ends of a dividing cell during anaphase. (Ans. D)
Explanation:
In mitosis after the metaphase stage, anaphase stage occurs where replicated chromosomes are divide and the copied chromosomes migrate to the opposite poles of the cell.
In anaphase stage two phases are occurs:
Anaphase A: In this phase chromosome moves to pole of a dividing cell, this movement is produced by the action occurs in kinetochores and a subclass present in microtubules present in kinetochores are known as kinetochore microtubules.
Anaphase B: In this phase separation of dividing cell poles from each other is occurred. This movement is produced by the action of inter-polar microtubules and astral microtubules.
What are CD4+ cells?
A.
HIV treatment cells
B.
immune cells that are destroyed by HIV
C.
an experimental AIDS vaccine
D.
opportunistic cells that destroy the immune system
What would happen if our atmosphere consisted of pure oxygen?
Mr. Goldsmith suggested that animals must capture energy from their environment. An example of this would be _____.
a rabbit eating grass
a lion running
mice sleeping
a flying squirrel landing on a branch
The correct answer is (a) A rabbit eating grass.
The green plants that make food by the process of photosynthesis is the ultimate source of energy. When the rabbit is eating grass, it will derive energy from it. Green plants is the main source of energy for herbivores animals. Any function of the body such as sleeping, jumping, running requires energy and it is obtained from the food that an organism eats.
Which plant cell organelle uses light energy to produce sugar?
A)
chloroplast
B)
mitochondria
C)
nucleus
D)
ribosome
What is an example of eukaryotic gene regulation? Why is gene regulation necessary or advantageous?
Eukaryotic gene regulation, exemplified by the control of transcription initiation, allows organisms to adapt to environmental changes and use resources efficiently, leading to evolutionary advantages.
Eukaryotic Gene Regulation
An example of eukaryotic gene regulation involves the control over the start of transcription, where a multitude of regulatory proteins and elements play a role. One key reason why gene regulation is necessary is because it allows cells to respond to environmental changes and allocate resources efficiently. Moreover, advantageous gene regulation can lead to better survival and reproductive success, providing an evolutionary benefit.
In eukaryotes, the regulation of gene expression is often far more complex than in prokaryotes, involving multiple mechanisms such as the presence of enhancers, which are distant DNA regions that loop back to interact with a gene's promoter. For instance, human cells must coordinate the activity of approximately 25,000 genes without the use of multigene operons, which adds layers of complexity to how genes are turned on and off. This complexity allows for a greater diversity in gene expression, which can be essential for the development and function of multicellular organisms.
The need for gene regulation is exemplified by changes in gene expression, which can have evolutionary consequences. Evolution can act on gene regulation patterns, and changes in these patterns can lead to adaptations that enhance an organism's fitness in changing environments.
Mangrove forests were traditionally viewed as unhealthy, unproductive environments.
True or False
The given statement is True.
Traditionally mangrove forests were considered as unproductive and unhealthy environments. Therefore people thought that their removal from the environment will make the environment healthy. Traditionally they were viewed as unhealthy and unproductive because there importance ere not known at that time. But now mangroves serves as a breeding ground for fishes and helps the fisherman to grow economically.
Answer:
ITS TRUE
Explanation:
How does life change in aquatic biomes as depth increases?
Life in aquatic biomes changes as depth increases due to factors such as light availability, temperature, dissolved oxygen, and nutrients. The photic zone extends to a maximum depth of 200 meters, beyond which light cannot reach. Different organisms are adapted to the conditions found in each zone, resulting in a diverse range of species in aquatic biomes.
Explanation:Aquatic biomes undergo changes in their living conditions as the depth increases. One important factor is the availability of light. The photic zone, where sunlight penetrates enough for photosynthesis to occur, extends to a maximum depth of 200 meters. Beyond this depth, known as the aphotic zone, light cannot reach. As a result, organisms in the aphotic zone rely on other sources of energy, such as chemosynthesis or consuming other organisms.
Another important factor is temperature. As water depth increases, temperature decreases, but it remains above freezing. This can affect the types of organisms that can survive in deeper parts of aquatic biomes.
Abiotic factors like dissolved oxygen levels and nutrients also vary with depth. Water near the surface of lakes and the ocean usually has more dissolved oxygen than deeper water, while deeper parts of the ocean are nutrient-rich due to dead organisms that fall from upper layers. These factors shape the structure and diversity of aquatic biomes at different depths.
Quartz is a rock-forming mineral.
True
False
A------------ is each step in a food chain that demonstrates the transfer of energy.
A trophic level is each step in a food chain that demonstrates the transfer of energy.
A trophic level is any feeding level in a food chain through which energy in the form of food is transferred in an ecosystem. A food chain contains five main trophic levels which are; (i) primary producers (autotrophs; plants and algae), (ii) primary consumers (herbivores), (iii) Secondary consumers (carnivores and omnivores), (iv) Tertiary consumers (carnivores and omnivores) and (v) Apex predators.
A 'trophic level' refers to each step in a food chain, showcasing the energy transfer from one organism to another. The energy transfer starts with the Sun and travels through different organisms, from producers to consumers, providing an understanding of a food chain.
Explanation:In the field of Biology, each step in a food chain, demonstrating the transfer of energy from one organism to another, is referred to as a trophic level. This energy transfer begins with the Sun, which provides energy to producers like plants. Herbivores, or primary consumers, consume these plants and gain energy.
Then, carnivores, or secondary and tertiary consumers, eat these herbivores and other carnivores to get energy. The energy transfer continues through each trophic level, demonstrating the concept of a food chain.
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The production of four haploid gametes from one mother cell is completed during
Answer:anaphase of meiosis I
Explanation:
Sam munches on some almonds. Identify the food group to which almonds belong.
fruits
milk products
meat and beans
vegetables
Correct answer choice is:
C. Meat and beans.
Explanation: The meat and beans food group comprise of meat, fish, chicken, nuts, seeds, eggs, and dried beans.
The large ground finch obtains food by cracking seeds. What is its short, strong beak an example of?
Final answer:
The large ground finch's short, strong beak is an adaptation resulting from natural selection and adaptive radiation, allowing it to crack hard seeds effectively.
Explanation:
The short, strong beak of the large ground finch Geospiza magnirostris is an example of adaptive radiation and natural selection. Through processes described by Charles Darwin, finches on the Galápagos Islands have adapted their beaks over generations to exploit different food sources effectively. For the large ground finch, its beak has evolved to crack open hard seeds, making it thicker and stronger compared to finches that eat other types of food, like insects or nectar.
Observations by researchers such as Peter and Rosemary Grant provide evidence for this evolutionary change. They reported that during a drought, finches with larger beaks could eat more types of seeds, and hence were more likely to survive. Their offspring also tended to have larger beaks, showing evolution by natural selection.
Why is blood type AB+ considered the universal receiver?
Individuals with AB+ blood can receive red blood cells from any other blood type because they have both A and B antigens and the Rh factor, and they do not have anti-A or anti-B antibodies.
Blood type AB+ is considered the universal receiver. Here is why:
1. Antigens on Red Blood Cells:
Blood type AB+ has both A and B antigens on the surfaces of its red blood cells. Antigens are substances that can provoke an immune response if they are foreign to the body.
2. Lack of Anti-A and Anti-B Antibodies:
AB+ individuals lack anti-A or anti-B antibodies, enabling them to accept red blood cells from any donor without their immune system attacking the new cells.
3. Rh Factor:
The '+' in AB+ indicates that the blood has the Rh antigen (also known as the Rh factor). Since AB+ individuals have the Rh antigen, they can receive blood from both Rh+ and Rh- donors.
Which process occurs in a human muscle when it is forced to make ATP without oxygen. A: ETS reactions. B: Cellular respiration. C: Lactic acid fermentation D: Alcoholic fermentation
What forms whenever a large body of air over land or water does not move for a long period of time?
Answer:
the answer is air masses i hope this helped :D
The irispupilscleracornea is the opening which allows light to enter the eye.
distinguish between the keywords "trait" and "allele".
_______________ is the difference in inherited traits an organism has from others of the same species
Answer:
The answer is Variations :)
Naturalistic observation is commonly used for anthropology studies. true or false
Answer:
Naturalistic observation IS commonly used for anthropology studies.
Explanation:
Some fruit flies are born with curly wings which makes them unable to fly. It has been shown that curly words are caused by a dominant gene which can be represented by the symbol W, while the recessive normal wing gene is represented by the symbol w. If a parent fly with the genotype WW is crossed with a parent of the genotype Ww, what percentage the offspring will have curly wings?
Answer:
The correct answer would be 100%.
The genotype of a parent is WW. Thus it will produce only one type of gamete that is, W.
The genotype of other parent is Ww and thus two types of gametes would be produced W and w.
The cross will result in the production of offspring with two types of genotypes WW and Ww.
Hence, all the fruit flies produced from this cross will have curly wings.
WILL UPVOTE!
Factor the expression.
x^2 - 49 =
Can you ZOOLEY??? Ive attached a file.
Yes, I can ZOOLEY.
What is ZOOLEY?ZOOLEY is a logic puzzle that involves figuring out which animals inhabit various areas of a zoo. The puzzle is presented as a map of the zoo, with the cages arranged in two rows, separated by an aisle or corridor. The animals live in cages, and their names are represented by a combination of letters and shapes.
To solve the puzzle, you need to use the clues given to you to figure out the names of the animals. For example, the clue "Which family is visiting the polar bears?" tells you that the family of people (Zuff) is visiting the polar bears (Trick).
Here are the answers to the ZOOLEY puzzle:
What family is visiting the polar bears? Zuff
What kind of family are they? Humans, they are outside the cages observing other animals.
Whose family is the largest? Kazoo
Which is the family of spiders? Lesger, spiders have 8 legs
Whose son has Mr Crocodile just swallowed? Breeze's son was swallowed. Thus, gobble are crocodiles and gender of each animal is designated by shape
Which swimming family has only 3 sons? Squeal. Note flipper and name similarity (ie. seal – squeal)
Which family has just 3 daughters? Lesger, spiders.
Is the polar bear's cub male or female? male.
Which family has no offspring? Slizz, there are only adults in the cage
Which is a family of snakes? Slizz, see lines similar to shape of snake
Which is a kangaroo? Swift, see pocket on side of female
What is the surname of the elephant's baby, which is soon to be born? Ample, see baby inside female, not a gobble because a male is inside a male.
How many sons has Mr. Giraffe? no sons. Noz are giraffes due to long legs
Which family has no father? Squeal
Which mother is away at the hospital? Noz, no female is in the cage
Who are the neighbours of the monkeys? Trick, they are polar bears. The monkeys are kazoo
A wee pelican has wandered into whose cage? Gobbles. this wee animal proves to be a pelican
Which is a family of pelicans? Beeze.
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The human nervous system is broken up into central and peripheral parts. The central system (CNS) is made up of _____.
a. the brain and the spinal cord
b. sensory and motor neurons
c. the brain and motor neurons
Answer:
the brain and spinal cord
Explanation:
Which pair of molecules are broken down by the cell to release energy?
a
ADP and carbon dioxide
b
ADP and glucose
c
ATP and glucose
d
ATP and carbon dioxide
The pair of molecules that are broken down by the cell to release energy is known as ATP and glucose. Thus, the correct option for this question is C.
Which process is known for this mechanism?The process that is known for this liberation of energy by the breaking down of molecules of ATP and glucose is known as Cellular respiration.
Cellular respiration may be characterized as a type of chemical process through which oxygen is significantly utilized in order to make energy from carbohydrates such as glucose. Glucose and ATP are high-energy compounds that provide immediate energy to the cells in order to facilitate their metabolic functions.
Therefore, the pair of molecules that are broken down by the cell to release energy is known as ATP and glucose. Thus, the correct option for this question is C.
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A scientist wants to test how much of a base can be added to a solution before the pH of the solution changes to above a certain point. The starting pH of the solution is 7.0, and the scientist wants to know when the pH of the solution changes to above 8.0.Which pH indicator should the scientist use? A.Methyl yellow, which changes from yellow to red around a pH of 4.0 B.Congo red, which changes from red to violet around a pH of 5.0 C.Alizarin yellow R, which changes from yellow to red around a pH of 10.2 D.Phenolphthalein, which changes from colorless to purple around a pH of 8.3
The right answer is D.Phenolphthalein, which changes from colorless to purple around pH of 8.3 (since it is the closest to pH 8).
Phenolphthalein (the symbol φφ (phi-phi) or the general notation HIn, common to other indicators, are used) is an organic compound of formula C20H14O4. It is a pH indicator (or a colored indicator), that is to say, a compound that changes color according to the pH value of the solution in which it is placed.
Lamarck's hypothesis of evolution was based on which theory?
Answer:
Lamarck's hypothesis of evolution was based on the theory of 'Inheritance of acquired character'.
Explanation:
Lamarck was french biologist and explained evolution on the basis of the theory of inheritance of acquired character.
According to Lamarck, organism can pass down the their characters to their offspring that have acquired through the environment by the use and disuse of an organ. Lamarck believe that the organism may acquire a character by the use and disuse of a particular organ. The acquired trait may pass down to the next generation through reproduction. The transmission of characters increases the organism's complexity.
A soccer player has been sprinting up and down the field. She is breathing very hard and has a burning sensation in her muscles. Which of the following is the most likely cause of her symptoms?
A. Muscles are getting rid of carbon dioxide by the Krebs cycle.
B. Muscles are building up lactate from anaerobic respiration.
C. Electron transport chains in the mitochondria are producing too much ATP.
D. Glycolysis is producing too much pyruvate from the high glucose levels in the body.
The correct answer to this question is B. Muscles are building up lactate from anaerobic respiration
Answer:
B. Muscles are building up lactate from anaerobic respiration.
Explanation:
During excessive physical activities such as sprinting, muscles carry out anaerobic respiration to compensate the need of ATP for their continuous contraction. It is done since oxygen availability can not meet the increased demand of ATP during excess physical activities. Anaerobic respiration in muscles converts pyruvate into lactate which in turn causes burning sensation in muscles. Hence, her symptoms are due to increased oxygen demand and buildup of lactate in muscles.