I'm pretty sure that the correct answer is Dark matter can be described as matter that <span>A. does not exert gravitational force but can be detected with light.</span>
Answer:
The interaction of cell surface receptor extracellular domains with secreted ligands is essential to most types of cell signaling and cell-cell communication. This initial step and the subsequent activation of membrane-proximal and -distal intracellular signaling cascades lead to specific, although often redundant, cellular responses that control cell proliferation, differentiation, maturation, and survival. Cell surface receptors usually bind their ligands through highly specific molecular interactions to provide the tight regulation necessary for control of physiological responses. However, researchers increasingly appreciate that many receptor systems exhibit, to a greater or lesser extent, cross-reactivity with a spectrum of different ligands
Explanation:
The statement above is TRUE.
Negative transcriptional regulation involves the binding of the repressor protein to the operator in order to prevent a gene from been expressed. Transcription in eukaryotic cells is controlled by proteins which bind to specific regulatory sequences and modulate the activity of the enzyme concerned. Regulation of transcription can be negative or positive.
Answer:
Transpiration is the process of water movement through a plant and it’s evaporation from aerial parts, such as leaves, storms and flowers. Water is necessary for plants but only a small amount of water taken up by roots is used for growth and metabolis.
Water loss is a problem that occurs.
Explanation:
While an open stoma is neccesary for the plant to undergo photosynthesis, it comes with a negative side effect: water loss. Over 95% of a plant’s water loss occurs through the storm via water vapor.