The term for the specialized structures inside a cell is organelles. These include ribosomes, the Golgi apparatus, and the nucleus found in eukaryotes. They each perform specific functions to help the cell survive.
Explanation:The generalized term for the specialized structures inside cell is organelles. Organelles are like the organs in our body; they perform specific functions that help the cell survive. Examples of organelles include the ribosomes which produce proteins, the Golgi apparatus which sorts and packages proteins, and the nucleus which is generally found in eukaryotes and controls cellular activities.
Eukaryotes, which include organisms like plants, animals, and fungi, are characterized by the presence of organelles, distinguishing them from prokaryotic cells (like bacteria), which lack these membrane-bound structures. Organelles enable eukaryotic cells to compartmentalize and efficiently perform various tasks.
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spores of the first known terrestrial plants have been found in what strata
Many scientists worked together to form a realistic model of the structure of the DNA molecule.
Part A: What was Erwin Chargaff’s major contribution to what we now know to be the structure of DNA? (2 points)
Part B: How did Watson and Crick’s research confirm Chargaff’s conclusion through their development of the model of DNA? (2 points)
Final answer:
Erwin Chargaff discovered the base pairing rules critical for DNA structure, which was confirmed by Watson and Crick through their double helix model, integrating Chargaff's rules with X-ray diffraction data.
Explanation:
Part A: Erwin Chargaff's major contribution to our understanding of DNA structure lies in his discovery of specific pairing rules, known as Chargaff's rules. He observed that in DNA, the amount of adenine (A) always equals the amount of thymine (T), and the amount of guanine (G) always equals the amount of cytosine (C). This finding was critical for deciphering the double helical structure of DNA.
Part B: James Watson and Francis Crick's research confirmed Chargaff's conclusions by incorporating them into the development of the DNA model. Utilizing the principle that A pairs with T and G pairs with C, alongside X-ray diffraction data from Rosalind Franklin, they proposed a double helix structure. In this structure, each strand of DNA is composed of a long chain of nucleotide pairs, with hydrogen bonds between A and T and between G and C, explaining Chargaff's observations and providing a physical mechanism for DNA replication.
Under a microscope, you can see that a plant cell has only half the usual number of chromosomes. What stage of the plant’s life-cycle are you witnessing?
Mosses are examples of which type of plant?
Explanation:
Botanically, mosses are non-vascular plants
A person who is interested in learning more about the "fight or flight" response may pursue a career in
endocrinology
gene therapy
microbiology
sports medicine
Answer:
The correct answer would be endocrinology.
The fight and flight response are stress response generated or regulated by hormones such as epinephrine and norepinephrine which are released from the adrenal gland.
Other hormones like testosterone, estrogen, and cortisol and neurotransmitters such as dopamine and serotonin also affect the organism's response to stress.
Thus, endocrinology would be the best career in order to learn more about these responses as endocrinology refers to the branch of science which deals with the endocrine system, hormones, and associated diseases.
Compare and contrast the terms living and biotic
The terms 'living' and 'biotic' are used in biology, each with distinct meaning. 'Living' refers to organisms that demonstrate the characteristics of life, while 'biotic' refers to all biological components, living or dead, within an ecosystem.
Explanation:The terms living and biotic are often used interchangeably in biology, but they carry subtle differences. When we say 'living', we are typically referring to anything that exhibits all characteristics of life - growth, reproduction, metabolism, response to environment, and evolution. For example, animals, plants, and microorganisms.
However, the term 'biotic' is broader and not limited to only living organisms. It encompasses all biological factors in an ecosystem, including organisms, their residues, and their influences on each other. Biotic factors include living organisms (like plants and animals), dead organisms, and components produced by organisms (like waste products).
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The quiver tree grows in southern Africa which of the following plant adoptions is likely to prevent these trees from dying out due to Rising Desert temperatures?
Releasing a black powdery substance on their trunk
shifting they're growing range towards the equator
shifting they're growing rage towards the poles
limiting seed dispersal to nearby locations
Evaluate the following scenario: Two days after visiting a pet shop and observing green parrots in a dis- play cage and fish in an aquarium, a student developed a fever, became quite ill, and was diagnosed with parrot fever. What might be the dis- ease reservoir and possible transmis- sion method?
The student most likely got parrot fever from inhaling aerosolized bird droppings or secretions from green parrots, which served as the disease reservoir. This transmission method is typical for zoonotic diseases. Proper handling and hygiene can help prevent the spread of such infections.
The student likely contracted parrot fever (psittacosis), a zoonotic disease caused by the bacteria Chlamydia psittaci, which can be transmitted from birds to humans.
The disease reservoir in this scenario is the green parrots observed at the pet shop. The probable transmission method is through inhalation of aerosolized bird droppings or secretions that contain the bacteria.
Parrot fever typically presents with flu-like symptoms, including fever, headache, and respiratory issues. It's important to handle birds with care and ensure good hygiene to prevent the spread of zoonotic diseases like these.
You have red hair
Jeans
Or
Genes??
Which statement best describes the leaf structures of monocots and dicots?
A. Dicots have narrow leaves with parallel veins, and monocots have broad leaves with a network of veins.
B. Monocots have narrow leaves with parallel veins, and dicots have broad leaves with a network of veins.
C. Dicots have narrow leaves with a network of veins, and monocots have broad leaves with parallel veins.
D. Monocots have narrow leaves with a network of veins, and dicots have broad leaves with parallel veins.
Answer: B
Monocots differ from the dicots In the structural features of the leaves, the stems, roots, and flowers. The differences start from the very beginning of the plant's life cycle: the seed. Monocots have one cotyledon, while dicots have two. When it comes to leaves, monocots have narrow leaves with the typical parallel leaf veins. Dicots have broad leaves with a network of netted leaf veins (branching).Answer:
the answer is B
Explanation:
Which structure is common in plant cells but rare in animal cells? ribosome mitochondrion vacuole lysosome
Answer:
mitochondria
Explanation:
The correct answer is option c) Vacuole because it is common in plant cells but rare in animal cells.
Vacuoles are membrane-bound organelles found in plant cells, as well as some fungal and protist cells. They are large, fluid-filled sacs that perform various functions, including storage of water, nutrients, and waste products, maintaining turgor pressure, and supporting the structure of the cell.
While animal cells may contain small vacuole-like structures called vesicles, they typically lack the large, central vacuole characteristic of plant cells. Therefore, vacuoles are much more abundant and prominent in plant cells compared to animal cells.
The incorrect options are:
a) ribosome: Ribosomes are present in both plant and animal cells. They are responsible for protein synthesis and are essential organelles found in all types of cells.
b) mitochondria: Mitochondria are found in both plant and animal cells. They are responsible for cellular respiration, producing energy in the form of ATP. While there may be some structural and functional differences between plant and animal mitochondria, they are present in both types of cells.
d) lysosome: Lysosomes are membrane-bound organelles containing enzymes responsible for intracellular digestion and waste removal. While lysosomes are more prevalent in animal cells, they are also found in some specialized plant cells, particularly those involved in defense and recycling processes. Therefore, while lysosomes may be rarer in plant cells compared to animal cells, they are not entirely absent.
The correct question is :
Which structure is common in plant cells but rare in animal cells?
a) ribosome
b) mitochondrion
c) vacuole
d) lysosome
Marcia reported the following symptoms to her physician: severe weight loss, increased anxiety, and sweating. After several tests, Marcia’s physician determines that she has a very high basal metabolic rate and confirms Marcia’s diagnosis as . Her physician prescribes as the best treatment for her condition.
Marcia is diagnosed with hypermetabolism. One pathological cause of hypermetabolism is thyroid disorder (hyperthyroidism). It could also be caused by injury or infection in the body. There is no single treatment for the disorder since it is merely a symptom of an underlying problem. It could be managed by nutritional support coupled with pharmacological treatment such as diuretics and regular insulin.
Answer:
She is diagnosed with hypermetabolism.
Explanation:
Hypermetabolism is metabolism at an excessive or increased rate and it is characterized by the abnormal increase in basal metabolic rate. It can signal the issues like hyperthyroidism. It occurs generally after significant injury to the body and the most common causes in the institutions and hospitals are burns, sepsis, traumas, infections surgery, bone marrow transplants etc. Its cause and location can be detected by PET scan. The symptoms includes anemia, sudden weight loss, fatigue, elevated heart rate, excessive sweating etc. It is itself a symptom and not an independent disease, treatment firstly requires attention to the underlying disease. The symptoms will subside, once the underlying cause is remedied.
Which of the following will increase the salt concentration in seawater?
A:) evaporation
B:) precipitation
C:) runoff
D:) ice cap melting
Which concepts are included in uniformitarian theory?
Erosion and deposition are currently very fast.
Erosion and deposition are currently very slow.
The Earth's crust has been formed by numerous local floods.
The Earth's crust has been formed by a major cataclysm.
The Earth's crust has been formed by current slow processes.
The Earth's crust must be relatively young.
The Earth's crust must be very old.
Major catastrophic processes are impossible.
Major catastrophic processes are possible.
(Choose all that apply)
Answer:
All of these are included in the uniformitarian theories:
1) The Earth's crust has been formed by floods and materials derived from that.
2) The Earth's crust has been formed by current slow processes.
3) Erosion and deposition are currently very slow, but with the time, it affects in a huge way the environment.
4) Major catastrophic processes are possible. They are violent and sudden, and that's how they affect so much the planet.
Why does competition occur in ecosystems?
A. Competition never happens in ecosystems
B. Competition occurs only within populations
C. Competition happens because resources are limited.
D. Competition happens only over food
Answer:
Option C. Competition happens because resources are limited.
Explanation:
When resources are limited in an ecosystem, the species compete with each other to come out as best among all.
As per the theory of natural selection, Darwin proposed that it is always the fittest of all that survive. By fittest he means the ones who are capable to compete and come out as the strongest among all to survive in a given ecosystem.
For Example - Male compete among themselves to attract the female. This is known as sexual selection.
Hence, option C is correct.
what is meant by high air pressure
Prehistoric remains of animals consist almost exclusively of bones and teeth. Why?
Zoo-archaeology is the branch of archaeology dealing with the study of faunal remains which are the remains or the items left after the death of the animal. These items mainly consist of bones, chitin, scales, teeth, hair and sometimes proteins or DNA. The skin, muscles or other organs usually are not found as they get damaged and decompose over the time by decomposers, by physical or environmental agents. This causes problems to identify and interpret the significance from these faunal remains as these provide incomplete information.
You have isolated a particular virus and have found that the amount of thymine present in its double stranded DNA is 23%. Based on that knowledge, what can you predict to be the percentage of guanine present in the same sample?
23%
46%
27%
54%
The Answer Is 27% . . . . . . . . . . . . . The dots are so I can post the answer, because without a long reply I can't answer.
Answer:
27% .
Explanation:
A (adenine) pairs with T (thymine) and has the same percentage. C (cytosine) pairs with G (guanine) and they both have the same percentage. In this case, the percentage of T (thymine) is 23%. So A (adenine) will also have 23%. This leaves the remaining percentage at 54% (100-46). So G and C will have 27% each (totaling 54%).
What is cancer and how does it relate to the cell cycle? 2. what are proto-oncogenes and tumor suppressor genes, and how do they contribute to cancer? 3. what are some things that might make a person have a higher risk of developing cancer? 4. what are some of the major steps that occur in the progression from a single cancer cell to a tumor and then to many tumors spreading throughout the body? 5. as tumors grow and spread, the cells undergo a number of changes. how might the cells in a late stage tumor be different from the original cell that became cancerous? 6. why are different types of cancers named based on where in the body they originate (breast cancer, skin cancer, bone cancer, etc.)? why does it matter from which organ or tissue type the cancer developed?
Which statement best explains the role of weathering and erosion in the rock cycle?
A. Rocks melt by this process.
B. Molten rocks solidify by this process.
C. They change the mineral composition of rocks.
D. They break rocks and transport them to new locations.
Answer:
The answer is D. They break rocks and transport them to new locations.
Explanation:
Weathering is the physical process in which a breakdown or breakage occurs in the rock, but without affecting its chemical or mineralogical composition, while the erosion of the rocks is the process that refers to the movement or transport of the material, in contrast to the alteration and disintegration of the rocks. It is one of the main factors in the rock cycle.
What are citrus fruits?
True or False: Alex used her fingers to remove the lid from a can of vegetables after he opened it with a can opener. Sophia knows this is an unsafe procedure.
What is the basis of an organic molecule?
A.The basic structure is the carbon atom.
B.The basic structure is the potassium atom.
C.The basic structure is a carbon monoxide molecule.
D.The basic structure is the iron atom.
What do scientists think forms the Moon's core?
The Moon's core is thought to have formed from a giant impact between Earth and a Mars-sized object. This event fragmented and mixed materials from both bodies, with the less dense splatter forming the Moon's smaller, metallic core composed mostly of iron, sulfur, and nickel.
According to this hypothesis, Earth was struck obliquely by an object roughly the size of Mars, sometimes referred to as Theia. This collision led to a violent mixing and scattering of material from both Earth and Theia, with the lower-density material coalescing to form the Moon. As a result, the Earth retained a higher density, with a thicker core, while the Moon developed a distinct crust, mantle, and a smaller metallic core mostly composed of iron, with some sulfur and nickel.
The Moon's core is estimated to be 600 to 800 kilometers in diameter, significantly smaller compared to Earth's. This hypothesis is supported by evidence including the moon rock samples gathered by astronauts, data from the GRAIL spacecraft, and studies conducted using seismometers during the Apollo missions. These findings suggest that the Moon's interior lacks a large metal core, has a crust depleted of water and volatiles, and shares similar oxygen isotope abundances with Earth, which supports the idea that it is made primarily of terrestrial mantle material.
Mendel's observation that traits are inherited separately was based on which set of experiments?
A. Monohybrid crosses
B. Purebred crosses
C. Testcrosses
D. Dihybrid crosses
the answer is A.) Monohybrid crosses
What are the three types of mutations
Jupiter’s Great Red Spot has been observed by astronomers since the 1600s. But what is it exactly?
Some lizards can undergo both sexual and asexual reproduction. Being able to reproduce asexually benefits the organism during times when mates are hard to find. Under what circumstances would asexual reproduction be most beneficial?
Which type of biotechnology would a dairy farmer use to mate the cows at his farm with genetically superior bulls to produce offspring that give high-quality milk? Genetic engineering because the genes of the cows are altered. Genetic engineering because cows with desirable traits are produced. Artificial selection because offspring with desirable traits are produced. Artificial selection because the process reduces the production time of offspring.
A type of biotechnology that would a dairy farmer use to mate the cows at his farm with genetically superior bulls to produce offspring that give high-quality milk is, that artificial selection because offspring with desirable traits are produced.
What do you mean by Biotechnology?Biotechnology may be defined as a group of technologies that deal with biological systems, living organisms, or parts of this to develop or create different products.
Human interference always leads to the production of desirable traits. This process is known as artificial selection.
This artificial selection always favors human needs. It is faster than natural selection and allows humans to develop organisms to their needs.
Therefore, the above example represents artificial selection because offspring with desirable traits are produced.
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Which sentence uses a demonstrative adjective that points out something near?
A. This ring on your finger is beautiful.
B. Sam tested that porch light.
C. Fred has those books at his house.