Why are Viroids not considered to be a type of virus? Viroids are plant pathogens: small, single-stranded, circular RNA particles that are much simpler than a virus. They do not have a capsid or outer envelope, but like viruses can reproduce only within a host cell. Viroids do not, however, manufacture any proteins, and they […]

How the continents have changed their positions over time? Today, we know that the continents rest on massive slabs of rock called tectonic plates. The plates are always moving and interacting in a process called plate tectonics. The continents are still moving today. As the seafloor grows wider, the continents on opposite sides of the […]

Which nerve conveys information about taste from the tongue to the brain? The Facial Nerve (CN VII) transmits encoded taste information away from the anterior two-thirds of the tongue in a branch called the chorda tympani. Since this cranial nerve passes through the middle ear on its way to the brain, it is sometimes damaged […]

Is the tendency to respond to stimuli that are similar to the conditioned stimulus? Generalization refers to the tendency to respond to stimuli that resemble the original conditioned stimulus. Is neutral stimulus the same as conditioned stimulus? A neutral stimulus is a stimulus which initially produces no specific response other than focusing attention. Once the […]

What produces food through photosynthesis? The process by which land plants produce their own food using sunlight and carbon dioxide is known as photosynthesis (Figure 1). The leaves of green plants contain chlorophyll, which absorbs sunlight for producing food. This food is then used by the plant itself as well as other animals, including humans. […]

What branch of science deals about matter and energy and their interactions? Physics What branch of science is matter and energy? What is the study of matter and energy and their interactions? Physics is the study of matter and energy at all scales—from the tiniest particles of matter to the entire universe. What scientist studies […]

What is the role of a primary consumer in a food web? A primary consumer in a food chain is the bottom level of animals that eat plants and grasses for nutrition. Organisms that produce their own food are called autotrophs. Primary consumers eat the plants for food, and then omnivores and carnivores each the […]

What are the 3 motions of the moon? Motions of the Moon Daily apparent revolution: Like all celestial bodies, the moon appears to revolve around the Earth, once every 24 hours. Daily growth and shrinking: Synodic revolution: Sidereal revolution: Secular slowing of the moon’s motion: Monthly growth and shrinking: Rotation on its axis: East-west Libration: […]

What is included in the scientific method? The basic steps of the scientific method are: 1) make an observation that describes a problem, 2) create a hypothesis, 3) test the hypothesis, and 4) draw conclusions and refine the hypothesis. What is an example of using the scientific method in everyday life? The scientific method involves […]

What is Pepsinogen secreted by? Gastric chief cells What gland produces Pepsinogen? PEPSIN. Pepsinogen is secreted from peptic (or chief) cells in the oxyntic gland. Some pepsinogen is also secreted from mucosal cells in the gastric antrum and the duodenum. In the presence of gastric acid this proenzyme is converted into active pepsin, which itself […]