What is Cell Junction Cell junctions, alternatively known as intercellular bridges, are specialized protein structures that provide a physical connection between the adjacent cells or between a cell and the extracellular matrix in plants and animals. These junctions are only found between immobile cells and are especially abundant in epithelial tissues. As they consist of cell adhesion molecules, they hold cells together. Cell junctions also enable cellular communication, provide tissue structure, and transport material between cells....

Plant fertilization is the union of male and female reproductive cells or gametes to produce the fertilized egg or zygote. In plants, fertilization is the process of sexual reproduction that occurs after pollination. Strassburger discovered fertilization in flowering plants in 1884. Fertilization is similar in flowering plants (angiosperms) and seed-bearing plants (gymnosperms). How does Plant Fertilization Occur The process of fertilization occurs in four basic steps . Fertilization in Plants...

what about fluids

An ideal gas is a hypothetical gas that is in close approximation to a real gas and obeys a specific set of laws. An ideal gas is suitable for modeling real gas and predicting the latter’s behavior. Properties of Ideal Gas Since ideal gas is hypothetical, we make a few assumptions to consider a gas ideal. The molecules do not interact. When they collide, the molecules do not attract or repel....

Print out the following worksheets and test your knowledge about the basic structure and parts of a plant. Suitable for: Kindergarten and Grade 1 Parts of a Plant Worksheet Download PDF Plant Parts Worksheet Colored Version Download PDF Suitable for: Grade 2, Grade 3 Parts of Plants and Their Functions Worksheet Download PDF Parts of a Plant Worksheet Cut and Paste Download PDF Fill your E-mail Address Popular Articles

Peripheral proteins are one of two membrane proteins found in living organisms, the other being integral proteins. As the name suggests, peripheral membrane proteins are located in the periphery of the lipid bilayer of cell membranes, attaching to the integral membrane proteins or penetrating the lipid bilayer. Thus they are also called extrinsic membrane proteins. The specific amino acid sequence in peripheral proteins allows them to interact with the phosphate head of the lipids or with the integral membrane proteins....

What is Seed Dormancy Certain seeds fail to germinate even when they are ripe and placed under favorable environmental growth conditions. In such seeds, resumption of growth is arrested by conditions within the seed. Seed dormancy is defined as the inability of a viable seed to germinate under conditions favorable for germination. These conditions are the combination of light, water, oxygen, temperature, humidity, gases, mechanical restrictions such as types of the seed coat and hormones....

What are Spindle Fibers Spindle fibers are a network of filaments called microtubules that move chromosomes during eukaryotic cell division. Spindle fibers formed in mitosis are called the mitotic spindle, while those formed in meiosis are called the meiotic spindle. Microtubules that form the spindle fibers come from centrosomes. Spindle fibers play a significant role during nuclear division. They are responsible for the separation of sister chromatids during mitotic and meiotic cell division....

Unless radiation resonates with a molecule no energy can by transferred. Think of a wine glass breaking as it resonates with the violin. off frequency little happens.

The urea or ornithine cycle is a series of biochemical reactions found primarily in the liver and, to some extent, in ureotelic animals such as amphibians and mammals. The pathway helps dispose of the highly toxic ammonia (NH 3 ) from the blood by converting it to urea CO(NH 2 ) 2 . Ureotelic animals cannot excrete ammonia directly and convert it into a more straightforward form, the urea in the liver....

Alternating current (AC) is a type of electric current that periodically reverses its direction of flow. Its polarity changes over time, and its magnitude fluctuates sinusoidally, typically following a waveform like a sine wave. This variation results in the current alternating between positive and negative values as it cycles through different phases, characterized by its frequency. This behavior is opposite to a direct current (DC), where the waveform remains steady over time....

Thank you for your thoughtful comment. I’ll look into updating the diagram to clarify this better.

Dear Sir or Madam, If it were possible to build a system wherein the rotating Object in your Centrifugal Force Formula had mass=1 for half a rotation and mass=0 for the other half rotation and this situation was repeated continuously over many cycles. Would this create an out of balance situation and a resultant net force in a given direction?

What is Collenchyma Collenchyma is a living, elongated cell with irregularly thick cell walls, found mainly in the cortex of stems and leaves of plants. Collenchyma tissue forms the fundamental or ground tissues in plants along with parenchyma and sclerenchyma. Collenchyma was discovered by Scheilden in the year 1839. Collenchyma Where are Collenchyma Located in Plants They are found below the epidermis or the outer layer of cells in young stems and in leaf veins of plants, while they are usually absent in roots....

An energy pyramid, also known as an ecological pyramid or trophic pyramid, is a graphical way of representing energy flow at each trophic level within an ecosystem. It is similar to a food chain and establishes the predator-prey relationship. The order of the bars representing each trophic level is based on which predator feeds on which prey. Energy flows from the bottom toward the top of the pyramid, decreasing as we move up....

Can someone explain to me how did the scientists come up with the conclusion about the thickness of each layer without going there or exploring it?

What is Sepal Sepals are small, leaf-shaped structures, forming the outer whorl of a flower. They are modified leaves, primarily green but can be of other colors too. Their number, size, and shape vary depending on the flower species. Sepals are either fused or separated. The sepals of a single flower are collectively called the calyx. They protect the flower bud and support the petals when in full bloom. Sepals...

Soil is the top layer of the earth’s surface, which consists of organic matter, humus, minerals, and inorganic substances. It acts as a medium for plant growth. Its formation is the combined effect of physical, chemical, biological processes that can go on for hundreds of years. The rock disintegrates into their constituent parts due to the impact of natural forces like wind, water, changes in temperature, etc. Soil can be classified according to their texture, color, proportions, and different forms of organic and mineral compositions....

What is Wheel and Axle A wheel and axle is a simple machine consisting of a round disc and a long rod. The disc is known as the wheel, and the rod attached to the wheel is the axle. It executes a rotational motion and is used for many purposes. Who Invented the Wheel and Axle Archeological evidence shows that the first wheel and axle existed in Mesopotamia during the Bronze Age around 3500 B....

Definition: What is a Converging Lens? A converging lens is an optical lens that converges all rays of light passing through it. The primary purpose of a converging lens is to focus the incoming rays from an object and converge them to form an image. The image can be magnified, diminished, or remain the same depending on the distance of the object from the lens. In many optical systems, converging lenses are used to get a better view of the object....