When hydrogen and oxygen combine to form water. This process is called as a chemical reaction and water formed in the reaction is called the product. Thus, the correct option is A.
A chemical reaction is a process which leads to chemical transformation In this process, two or more reactants combine and undergo reaction to form the product. The product formed is different from reactants in chemical properties.
There are four main types of chemical reactions. These are as follows: 1. Synthesis reactions, 2. Decomposition reactions, 3. Single-replacement reactions, 4. Double-replacement reactions.
An enzyme is a biocatalyst which is when added to a chemical reaction increases the rate of a reaction. Catalysts are the chemical compounds which decreases the activation energy and hence the formation of product increases.
Therefore, the correct option is A.
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b. No intercellular spaces
c. Irregular shape
d. Big vacuole
Answer:
C
Explanation:
Irregular shape
2. Describe how a food chain differs from a food web and explain what the arrows on the food chain show
Answer:
need help
Explanation: tell me
Answer: The correct answer is that steroidal hormones enter the nucleus and change gene expression in a target cell.
Steroidal hormones are hydrophobic in nature due to which they easily cross plasma membrane (lipid bilayer).
Their receptors are generally present inside the cell either in cytoplasm or on nuclear membrane.
They usually produce their effect by changing the gene expression of the cell.
Example of steroidal hormone may include estrogen, testosterone, et cetera.
I believe the correct answer is C. Enter the nucleus and change gene expression in the target cell.
Steroid hormones are released by steroid glands namely the testes, the ovaries and the adrenal cortex of the adrenal gland. They are lipophylic and can pass through the cell membrane of the target cell producing a faster response.
Steroid hormones belong to a class of body chemicals called steroids that are formed during the process of steroidogenesis. Examples include estrogen, progesterone, testosterone and glucocorticoids produced by the adrenal cortex of the adrenal gland on top of the kidney. The adrenal gland is divided into the adrenal medulla that produced epinephrine and norepinephrine and the adrenal cortex that is further divided into 3 regions i.e. the zona reticularis is the lowest layer and produces the hormones testosterone and estrogen that are both steroid hormones, middle zona fasculata that makes mineralocorticoids and the topmost layer called the zona glomerulosa that produces pure steroid hormones such as cortisol that helps the body to respond to stress.
The steroid hormones are lipophilic (lipid loving) hence they can pass through the membrane of the cell much more easily and reach the nucleus of the cells to cause a change in gene expression. This hormone is in contrast to the other hormone type i.e. non steroid hormones that are made of chains of amino acids to be polypeptides. They are the majority of hormones and attach to cellular receptors such as g protein coupled receptors (GPCR) then cause phosphorylation in the cell via the cAMP pathway to cause the cell to undergo changes in gene expression. They are lipophobic (lipid hating) meaning they cannot pass through the lipid bilayer of the cell membrane. The hormones can be local acting and act on the same cell that produced the hormone (autocrine), acting on neighboring cells (paracrine) or acting on distant cells (endocrine). They function the same as neurons to produce a response but they are slower and have a long lasting effect compared to neurons. They also are chemical signals compared to the electrical signals of neurons.
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Level: High School
Subject: Biology
Topic: The cell
TRUE
Pollution can be defined as the introduction of biological matter, particulate and chemicals that are harmful to humans, plants and animals. pollution can also cause damage to natural environment. However, animal digestion can cause natural air pollution by releasing methane which is a greenhouse gas.
Answer: True
Explanation: Human beings pollute the air by undergoing several activities like burning of fossil fuels, combustion of the fuels by the automobiles, emission of hazardous gases from industrial and agricultural wastes. But human beings are not only responsible for this pollution but animals like cattles (cow, baffallo) excreate a large amount of dung which is a source of greenhouse polluting gas called as methane.