D - Enormous energy requirements
Facilitated diffusion is the process of spontaneous passive transport of molecules or ions across a biological membrane via specific transmembrane integral proteins.
The solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. This process is called passive transport or facilitated diffusion, and does not require energy.
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In natural selection, the finches on the Galapagos Islands. The bug population greatly decreases, and only the finches with the strong beaks were able to survive as they could access the nut meats encased in hard shells. However, when a drought swept through the area, the trees didn't bear any nuts, and so the finches with the larger beaks died off and the finches with the slimmer beaks <span>survived as they could reach the bugs deep in the crevasses of the tree bark.
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Answer:
Anaerobic heterotroph
Explanation:
E. histolytica It is an anaerobic parasite of the protozoan family. It's anaerobic because they can survive within the human being's organism in the absence of oxygen. It is heterotrophic because it feeds on digested food in the intestine of its guests. It also kills and degrades nearby cells to ingest nutrients.
This amoeba causes diarrhea. Amebic colitis is one of the leading causes of diarrhea in the world, especially in developing countries.
Answer and Explanation:
The interphase is the previous step before mitosis occurs. The interphase is conformed of the G1, S, and G2 stages.
- During the G1 stage, it occurs a high intense biochemical activity. The cell duplicates its size, and the organelles and other molecules and cytoplasmatic structures duplicate too. Some structures, such as microtubules and actin filaments, are synthesized from zero. The endoplasmic reticulum increases in size and produces a membrane for the Golgi apparatus and vacuoles, lysosomes, and vesicles. During this stage, the pair of centrioles separate, and each centriole duplicates. Mitochondria and chloroplasts also replicate.
The stages S and G2 follow the G1. Once the whole interphase is completed, mitosis occurs.
- During the S stage occurs the DNI replication process. At this point, it also occurs the synthesis of histones and other associated proteins. This is the only stage where the DNI molecule is replicated.
- G2 stage is the final one before the cellular division. Here it begins the slow process of DNI condensation. Duplication of centrioles completes. Structures such as spindle fibers are assembled.