Answer:
Yes, protists have motility.
Explanation:
Protists are <u>unicellular eukaryotic organisms</u>, which are included in a separate kingdom, as they are not included in the animalia, plantae or fungi kingdoms. They possess true nucleus, organelles, membrane and cell wall.
Many of the protistic organisms can be mobilized by modifications in their cytoplasm or by the existence of mobile appendages.
- <em>Pseudopodia</em><em>: also called false feet, they consist of modifications in the cellular form that allows them to move from one place to another.
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- <em>Cilia</em><em>: these are numerous hairy structures that are found on the outside of the cell, and their coordinated movements provide the protists with mobility.
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- <em>Flagellae</em><em>: unlike the cilia, these are less numerous structures, one or two, present on the outside of the cell whose whip-like movement confers movement.</em>
Protists have motility due to modifications in their cytoplasm, as well as the existence of mobile appendages, such as cilia and flagella.
Learn more:
Protists movement brainly.com/question/894574
Answer:
The correct answer is: C. Active Transport.
Explanation:
Because Na+ and K+ are ions, which makes them <em>charged molecules</em>, they can only diffuse through the cell membrane when using specialized protein channels. This is called <u>facilitated diffusion</u> and is a form of passive transport because sodium and potassium move <em>following their gradients</em>, which are made of the difference in concentration between the inside of the cell and the outside of the cell. For example, potassium is highly concentrated inside the cell and poorly concentrated outside the cell, so potassium diffuses from the inside to the outside to even the concentrations.
But the question asks in which process Na+ and K+ move in and out of the cell SIMULTANEOUSLY, so the answer is actually <u>active transport</u>. Active transport is the opposite of passive transport. While passive transport occurs naturally and doesn't need ATP (energy) to happen, active transport needs ATP because it moves molecules AGAINST their gradient. One of the most famous and important structures involved in active transport is the Na+/K+ pump, which consists of a <em>specialized protein using energy to enter 2 potassium ions and take out 3 sodium ions at the same time</em>. This Na+/K+ is fundamental to maintain the gradients, which are important for the correct functioning of many cells.
Answer:
Explanation:
However, ATP production by anaerobic respiration may still support some further muscle contraction. Ultimately, the accumulation of lactic acid from anaerobic respiration and the depletion of resources (ATP, oxygen, and glycogen) lead to muscle fatigue, and muscle contraction stops.
Answer:
The correct answer is A.
Explanation:
A mutagen changes the level of mutations that occur in the DNA either by affecting it physically or chemically. This helps researchers create different organisms with altered phenotypes according to what the research needs so that the genes can be investigated further under a controlled environment.
So the answer is A.
I hope this helps.