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What are the weaknesses of cross sectional study?
Cross-sectional studies only provide a snapshot of data at a single point in time, so causality or temporal relationships cannot be established. They also do not account for changes in variables over time or allow for the study of individual patterns of change. Additionally, they may be subject to bias due to differences in participants at varying time points.
Which sociological perspective would look at patterns of male dominance in cross-sex conversations as a battleground in the struggle for sexual equality?
The feminist perspective within sociology would likely examine patterns of male dominance in cross-sex conversations as a reflection of broader power dynamics and inequalities between men and women in society. They would view this as part of the ongoing societal struggle for gender equality and challenge the norms and structures that perpetuate male dominance in communication.
Why did george murdock examine hundreds of cultures in the 1940s?
George Murdock examined hundreds of cultures in the 1940s to identify patterns of similarities and differences in societal structures and behaviors. By conducting this cross-cultural analysis, he aimed to identify universal aspects of human culture and society, as well as variations that can exist across different cultural groups.
Which social science is most closely related to anthropology?
Sociology is the social science that is most closely related to anthropology. Both disciplines study human behavior, societies, and cultures, but sociology tends to focus more on the larger social structures and institutions, while anthropology often emphasizes the cross-cultural and holistic study of human societies.
How many cars cross the Forth bridge in a week?
On average, around 70,000 cars cross the Forth Bridge in a week.
What is cell membrane permeability?
It is the ability of the membrane to allow ions and/or particles to cross.
What structure allow small particles to cross cell membrane?
Osmosis.
Which particles-starch or Lugol's-were able to cross the model cell membrane?
The Lugol's solution particles were able to cross the model cell membrane, while the starch particles were too large to pass through. Starch is a large molecule that cannot diffuse across the membrane, while Lugol's solution contains smaller molecules (iodine and iodide ions) that are able to pass through.
Are the salt particles able to cross the membrane?
If you are referring to osmosis, the salt doesn't cross the membrane, water does. Water will move into the salt water to attempt to dilute it to create homeostatsis, or equal concentrations on each side of the membrane.
How do polar molecules cross the cell membrane?
Polar molecules cross the cell membrane through a process called facilitated diffusion, where they move with the help of specific transport proteins embedded in the membrane. These proteins create channels or carriers that allow polar molecules to pass through the hydrophobic interior of the membrane.
What is meant when a system has reach equilibrium?
when the substance can cross the cell membrane, its particles will tend to move toward the area where it is less concetrated
What properties of carbon dioxide and oxygen allow them to easily cross a membrane?
i believe its their small size-- low atomic weight.
Why is the tonicity of a solution important?
TONICITY describes the degree to which a solution can exert an osmotic pressure on a membrane. Particles which can freely cross a membrane do NOT affect tonicity. This is because they will freely move in order to achieve equilibrium. Therefore, tonicity is dictated by the particles than can't cross the membrane (such as proteins, which are usually too large to cross, or highly charged particles). Non-permeable particles will therefore force water to cross the membrane towards them in order to achieve equilibrium - they can therefore be said to exert an osmotic pressure on the membrane.Solutions can be HYPERTONIC (i.e. the surrounding solution contains a larger concentration of these non-permeable particles than inside the cell, causing water to LEAVE the cell) or HYPOTONIC (i.e. the opposite, where water moves INTO the cell). They can also be ISOTONIC (there is equilibrium of the non-permeable particles, so no water moves).There is a very important distinction between tonicity and OSMOLARITY: osmolarity ALSO takes into account the particles that CAN cross the membrane (the permeable ones). So a solution could be both HYPEROSMOLAR and ISOTONIC at the same time - one set of particles will be able to freely cross the membrane, so there will no net change in cell volume.
What are two structures that a material would have to cross to enter the cytoplasm of a plant cell?
In order to enter the cytoplasm of a plant cell, a material would have to cross the plasma membrane and then the cell wall. The plasma membrane regulates what enters and exits the cell, while the cell wall provides structural support and protection.
What are the 3 methods of the cell membrane process?
If you're asking three ways particles cross the cell membrane it's through: (1) Simple diffusion,(2) Facilitated diffusion,(3) Active transport.
Is an ability of a plasma membrane to allow some substance to cross across the membrane more easily than others?
Yes, the ability of a plasma membrane to allow some substances to cross more easily than others is called selective permeability. This is due to the presence of specific transport proteins and channels that facilitate the movement of certain molecules while restricting others. The lipid bilayer of the membrane also plays a role in regulating which substances can pass through.
Which substances are able to cross the membrane, and what determines their ability to do so?
Certain substances, such as small molecules and ions, are able to cross the cell membrane. The ability of a substance to cross the membrane is determined by its size, charge, and solubility in the lipid bilayer of the membrane.
