Which molecules do not normally cross the nuclear membrane? Hints Which molecules do not normally cross the nuclear membrane? DNA Nucleotide triphosphates mRNA Proteins
DNA does not normally cross the nuclear membrane.
The nuclear membrane, also known as the nuclear envelope, is a double-membraned structure that surrounds the nucleus of eukaryotic cells. It has selective permeability, allowing only specific molecules to pass through. DNA is a large and complex molecule that does not freely diffuse through the nuclear pores in the nuclear envelope. Instead, it is transcribed into mRNA within the nucleus, and only the mRNA molecules, not the DNA itself, can exit the nucleus through nuclear pores to reach the cytoplasm.
This separation of DNA from the cytoplasmic environment is critical for the regulation and protection of the genetic material. In contrast, nucleotide triphosphates (used for DNA and RNA synthesis), mRNA, and proteins are molecules that can move in and out of the nucleus through the nuclear pores as needed for various cellular processes.
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What was Rudolph Virchow contribution to the cell theory
Wind moving in two directions over a prairie makes air in the middle spin. This is the beginning of a
A student is conducting an experiment to determine what type of soil earthworms prefer, wet or dry. Ten earthworms are released into a cardboard box that contains dry soil on one side and wet soil on the other. Over 24 hours, the student records the number of earthworms on both sides every hour. What component of the above experiment is the dependent variable?
species of worm used
number of trials
average number of earthworms in each type of soil
soil mosisture
The dependent variable in the experiment is the average number of earthworms in each type of soil
What is an experiment?In science, we are often looking out for cause and effect relationships. This lies at the center of most of the scientific investigations that we often engage in. In this case the student is trying to ascertain what type of soil earthworms prefer, wet or dry.
The procedure of the experiment is to release ten earthworms into a cardboard box that contains dry soil on one side and wet soil on the other. During the experiment, the student records the number of earthworms on both sides every hour.
It is clear that the dependent variable in this case could easily be seen and understood to be the average number of earthworms in each type of soil.
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Heartworms are an example of what types of parasite?
What are the similarities and differences of leisure, recreation and play?
please help, i dont understand this?
2. Which of the following is NOT a threat to biodiversity? A) Pollution. B) deforestation. C) crop rotation. D) climate change.
The option (C) is correct. Crop rotation is not a threat to biodiversity.
What do you mean by biodiversity?Biodiversity or biological diversity is the variety and variability of life on Earth. Biodiversity is a measure of variation at the genetic, species, and ecosystem level.
Moreover, biodiversity is all the different kinds of life you'll find in one area—the variety of animals, plants, fungi, and even microorganisms like bacteria that make up our natural world. Each of these species and organisms work together in ecosystems, like an intricate web, to maintain balance and support life.
Therefore, most people recognize biodiversity by species—a group of individual living organisms that can interbreed. Examples of species include blue whales, white-tailed deer, white pine trees, sunflowers, and microscopic bacteria that can't even be seen by the eye.
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BIOLOGY HELP PLEASE
Water is the most abundant molecule found in living organisms. Most mammals, in fact, are approximately 70% water by weight. About two-thirds of this water is present inside cells. The other one-third is present outside cells (e.g., in blood plasma or other body fluids). Why is water so important to cells?
Question 18 options:
Water is stored in cells to be used when the organism gets thirsty.
Almost all chemical reactions in life process occur in solutions with water.
The main structural component found in plasma membranes and cell walls is water.
Within this body part, lymph acquires particles that help the _______ system function.
Within this body part, lymph acquires particles that help immune system function. According to Merriam dictionary, immune system is defined as “the bodily system that protects the body from foreign substances, cells, and tissues by producing the immune response and that includes especially the thymus, spleen, lymph nodes, special deposits of lymphoid tissue (as in the gastrointestinal tract and bone marrow), macrophages, lymphocytes including the B cells and T cells, and antibodies.”
Final answer:
The lymphatic system is pivotal in supporting the immune system by transporting lymph that contains lymphocytes, which are vital for defending the body against specific pathogens and ensuring long-lasting immunity.
Explanation:
Within the lymphatic system, lymph acquires particles that help the immune system function. The lymphatic system plays a crucial role in the body's defense mechanisms by transporting lymph, a fluid containing white blood cells called lymphocytes, throughout the body. These lymphocytes are central to the adaptive immune system, responsible for recognizing and defending against specific pathogens or tumor cells. The lymphatic system includes organs such as lymph nodes, the spleen, and the thymus gland, all of which work together to filter out pathogens and cellular debris, produce and mature lymphocytes, and ultimately support long-lasting immunity against diseases.
What happens to a gummy bear in salt water?
He flap of elastic cartilage that protects food from entering the larynx when swallowing is the
During the cold winter months, the surface of a lake becomes hard ice. This is due to which change of state?
Condensation
Evaporation
Melting
Freezing
Answer:
Freezing
Explanation:
During cold winter months, the water on the surface of lakes/water bodies changes its state from liquid to solid state (ice) and the process is known as freezing. This phenomenon helps the flora and fauna living under such water bodies survive even in extremely cold weather. The ice being less dense than water floats on the surface of lake and acts as a shield. This shield of ice acts as an insulator and restricts the outside cold waves from entering the water beneath the ice cover and maintains optimum temperature inside. Hence due to the change of state of water, the flora and fauna is able to survive even in harsh winter season.
Is a crocodile a carnivore herbivore or omnivore?
Crocodiles are carnivorous animals that feed on many vertebrates such as fish, reptiles, birds and mammals, and occasionally invertebrates such as molluscs and crustaceans, depending on the species and age.
What are Carnivorous?A carnivore is defined as an organism that eats mostly meat, or the flesh of animals. Sometimes carnivores are called predators while the organisms that prey on carnivores are called prey. Carnivores are a major part of the food web which is the details of which organisms eat which other organisms in the wild.
These are described as animals that eat other animals. The word is derived from the Latin word and means "flesh-eater." Wild cats, such as lions, crocodiles and tigers, are examples of vertebrate carnivores, as are snakes and sharks, while invertebrate carnivores include sea stars, spiders, and ladybugs.
Thus, Crocodiles are carnivorous animals that feed on many vertebrates such as fish, reptiles, birds and mammals, and occasionally invertebrates such as molluscs and crustaceans, depending on the species and age.
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The two brassica morphs used in this lab differ at the body color locus. list 3 other aspects of phenotypic variation that you might reasonably expect to see among plants:
The 3 other aspects of phenotypic variation can be size of leaves, shape of leaves, size of seeds.
Further Explanation:
All the plants have a basic body organization. They possess stem, root, leaf etc. Every plants differ from each other. The different forms of the species of plants is known as morphs of plant.
The genetic variation may result in occurrence of different forms or morphs of an organism. These variations are crucial for evolution to occur and also in determining the relative fitness of an organism. The genetic variation can also be exhibited in the form of phenotypic variation.
Brassica is the genus of plant that belongs to mustard family. They are used in production of nutritionally important vegetables such as cabbage, mustard, broccoli etc.
Brassica also exhibits different morphs. An example of morphs of Brassica plants can be the two brassica morphs that differ at the body color locus. The presence of different alleles in the population at the body color locus of the brassica plant may give rise to differential body color in brassica morphs. The other phenotypic variation that can be seen among these plants are-
• Size of leaves
• Shape of leaves
• Size of seeds
The size and shape of leaves may influence the photosynthesis efficiency of a plant. The size of seed may influence the amount of storage product present in them.
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Answer Details:
Grade: College Biology
Subject: Biology
Chapter: Genetics of Brassica plant
Keywords:
Morphs, genetic variation, phenotypic variation, evolution, Brassica, broccoli, cabbage, mustard, locus, relative fitness, alleles, population, species.
Daphnia are freshwater organisms sometimes referred to as “water fleas.” Design an experiment that
could be used to test the effects of temperature on the size of a daphnia population. In your
experimental design, be sure to:
• state a hypothesis to be tested
• describe how the control group will be treated differently from the experimental group
• identify the independent variable in the experiment
• identify the type of data that will be collected
Answer:
Experiment to test the effect of temperature on the size of a daphnia population:
1. The hypothesis to be tested is: "Cooler temperature will reduce the size of the population due to a decrease in the reproduction rate while the hotter temperature will increase the size of the population due to an increase in the reproduction rate.
2. In all groups, daphnia will be counted weekly at the same time. The amount of water and nutrients supplies will be the same between groups. The only thing that will change is the temperature. For example:
Control group will be at 20 Celcius degrees, the cooler group will be at ten Celcius degrees, and the hotter group will be at 30 Celcius degrees.
3. The independent variable is the temperature.
4. The dependent variable (data that will be collected) is the size of the population.
Explanation:
Daphnias are microscopic crustaceans, which are called water fleas because of their saltatory behavior like fleas. Their life span and reproduction can be affected by different factors, including the abundance of predators, food, and temperature. They alternate their reproduction strategy during their life; they can reproduce asexually and sexually. Lower temperatures (cooler) decrease their metabolic and reproduction rate while higher temperature (hotter) increase their metabolic and reproduction rate. Because they can reproduce more times during their life span and the reproduction rate is higher in higher temperatures, I expect that temperature will affect the size of the population of Daphnia.
Hot coffee in a vacuum flask (thermos) is an example of what type of system?
Final answer:
Hot coffee in a vacuum flask (thermos) is considered an approximation of an isolated system in chemistry, which is designed to significantly slow down heat transfer but not completely prevent it.
Explanation:
Hot coffee in a vacuum flask, also known as a thermos, is an example of an isolated system in chemistry.
An isolated system is defined as one that does not allow the transfer of energy or matter into or out of the system.
While no system can be perfectly isolated due to eventual heat transfer to the surroundings, a thermos with hot coffee is a good approximation because it is designed to significantly slow down heat transfer, thanks to its vacuum insulation and other features like reflective walls.
Over time, however, even in a thermos, the coffee will cool as some heat is lost to the surroundings, illustrating that a truly isolated system does not exist but can be approximated for practical purposes.
Information processing in the body involves neurons communicating with each other at their _____.
One of the longest field studies of predator-prey population cycles has been of
Discuss why cell division is essential in the developmental stages of fetal growth as it relates to cell communication that leads to cell differentiation.
Is a regulatory mechanism in which the end product of a metabolic pathway inhibits an enzyme that catalyzes an early step in the pathway?
A patient reports abdominal cramps and diarrhea. the patient's serum potassium level is 6.8 meq/l. what might the nurse infer from this finding?
Diffusion by which mechanism occurs more rapidly in metal alloys?
The molecule arrangement of ice, water and steam are very different. _______ has the most ordered arrangement, ______ has the next most orderly arrangement, and ___________ has the least orderly arrangement of molecules.
Answer:
A) ice, water, steam
Explanation:
I did the usatestprep
What is another name for carbohydrates? a atp b fats c glucose (sugar)?
Which bone is best used to determine the age of an individual?
Genes are positioned on thread like bodies found in the nucleus of a cell. they are called
Process by which two simple molecules are joined by the removal of one water molecule
Order the taxa from largest (first) to smallest (fifth). 1. first domain 2. second order 3. third kingdom 4. fourth class 5. fifth phyla/division
What is the type of organism that breaks down the cells of a dead organism?