jakhunter354
02.12.2020 •
Biology
The cell organelle that functions in energy production is the
A. chlorophyll
B. mitochondrion
O c. chloroplast
D. nucleus
Solved
Show answers
More tips
- C Computers and Internet How to Download Movies from Torrents?...
- F Food and Cooking How to Make the Perfect Glühwein: Step-by-Step Guide...
- A Animals and plants How to Grow Lime from a Seed: Simple Tips and Interesting Facts...
- S Style and Beauty How to Properly Tie a Tie: 5 Simple Steps...
- C Computers and Internet Dynamically Assigned IP Address: What Is It and How Does It Work?...
- C Computers and Internet How to Check the Speed of My Internet?...
- H Health and Medicine 5 Simple Steps to Quit Smoking for Good...
- C Computers and Internet How to Download Videos from YouTube? Simple Steps to Download Any Content...
- H Health and Medicine What is the Normal Blood Sugar Level in a Healthy Person?...
- S Style and Beauty How to Get Rid of Acne: Scientifically Proven Methods...
Answers on questions: Biology
- B Biology Assume you are working for a chemical company and are responsible for growing a yeast culture that produces ethanol. The yeasts are growing well on the maltose medium...
- B Biology Which statement is characteristic of reproduction in humans? 1)The reproductive cells of males and females differ in chromosome number. 2) Males and females produce...
- B Biology Describe one example of two subsystems working together....
- B Biology Use the following information to answer the question. Nitrogenase, the enzyme that catalyzes nitrogen fixation, is inhibited whenever free oxygen (O2) reaches a...
- B Biology What are some of our key mineral resources and what are our known reserves?...
- B Biology What is the difference between aerobic respiration and anerobic respiration? 1.) Aerobic respiration produces ATP, and anaerobic respiration does not. 2.) Anaerobic...
- B Biology Which renewable energy source would be MOST appropriate for lands near a flowing stream or river? microhydro geothermal wind energy O biofuels...
- B Biology The question is down below! need help urgently, will mark brainliest Thanks! ^^...
- B Biology 2 Explain how the following factors affect the rate of photosynthesis (a) Light intensity(b) Temperature...
- B Biology What is the correct order for the application of Koch s postulates? a. Inoculate suspect agent into test subject and observe that subject develops disease of interest...
Ответ:
mitochondrion
Explanation:
this is where cellular respiration occurs. Cellular respiration occurs to breakdown biomolecules to produce energy
hope this helps
Ответ:
Most hormones circulate in blood, coming into contact with essentially all cells. However, a given hormone usually affects only a limited number of cells, which are called target cells. A target cell responds to a hormone because it bears receptors for the hormone.
In other words, a particular cell is a target cell for a hormone if it contains functional receptors for that hormone, and cells which do not have such a receptor cannot be influenced directly by that hormone. Reception of a radio broadcast provides a good analogy. Everyone within range of a transmitter for National Public Radio is exposed to that signal (even if they don't contribute!). However, in order to be a NPR target and thus influenced directly by their broadcasts, you have to have a receiver tuned to that frequency.
Hormone receptors are found either exposed on the surface of the cell or within the cell, depending on the type of hormone. In very basic terms, binding of hormone to receptor triggers a cascade of reactions within the cell that affects function. Additional details about receptor structure and function are provided in the section on hormone mechanism of action.
A traditional part of the definition of hormones described them as being secreted into blood and affecting cells at distant sites. However, many of the hormones known to act in that manner have been shown to also affect neighboring cells or even have effects on the same cells that secreted the hormone. Nonetheless, it is useful to be able to describe how the signal is distributed for a particular hormonal pathway, and three actions are defined:
Endocrine action: the hormone is distributed in blood and binds to distant target cells.
Paracrine action: the hormone acts locally by diffusing from its source to target cells in the neighborhood.
Autocrine action: the hormone acts on the same cell that produced it.
Two important terms are used to refer to molecules that bind to the hormone-binding sites of receptors:
Agonists are molecules that bind the receptor and induce all the post-receptor events that lead to a biologic effect. In other words, they act like the "normal" hormone, although perhaps more or less potently. Natural hormones are themselves agonists and, in many cases, more than one distinct hormone binds to the same receptor. For a given receptor, different agonists can have dramatically different potencies.
Antagonists are molecules that bind the receptor and block binding of the agonist, but fail to trigger intracellular signalling events. Antagonists are like certain types of bureaucrats - they don't themselves perform useful work, but block the activities of those that do have the capacity to contribute. Hormone antagonists are widely used as drugs.
Finally, a comment on the names given hormones and what some have called the tyranny of terminology. Hormones are inevitably named shortly after their discovery, when understanding is necessarily rudimentary. They are often named for the first physiologic effect observed or for their major site of synthesis. As knowledge and understanding of the hormone grow, the original name often appears inappropriate or too restrictive, but it has become entrenched in the literature and is rarely changed. In other situations, a single hormone will be referred to by more than one name. The problem is that the names given to hormones often end up being either confusing or misleading. The solution is to view names as identifiers rather than strict guidelines to source or function.