What is AB cell? B cells are a type of lymphocyte that are responsible for the humoral immunity component of the adaptive immune system. These white blood cells produce antibodies, which play a key part in immunity. Lymphocytes account for about 25% of white blood cells, and B cells represent approximately 10% of total lymphocytes. […]

Does any digestion of food occur in the esophagus quizlet? Does any digestion of food occur in the esophagus? Inside the esophagus, there is no digestion, only in the mouth, stomach, and intestines. What are the primary functions of the stomach? Break down and digest food in order to pull out necessary nutrients from what […]

What are the levels of biological organization? Typical levels of organization that one finds in the literature include the atomic, molecular, cellular, tissue, organ, organismal, group, population, community, ecosystem, landscape, and biosphere levels. What are the 5 levels of organization in biological systems? The biological levels of organization of living things arranged from the simplest […]

What type of bond is formed when an amino acid binds to its tRNA? Peptide bond formation What molecules on the tRNA do the amino acids attach to? Each tRNA molecule has two distinct ends, one of which binds to a specific amino acid, and the other which binds to the corresponding mRNA codon. During […]

Is a snail an invertebrates? Slugs and snails belong to a group of invertebrates called Mollusca. They are found all over the world and there are numerous different species. What is a snail classified as? The Class Gastropoda (in Phylum Mollusca) includes the groups pertaining to snails and slugs. The majority of gastropods have a […]

What is the second part of a scientific name unique to? The first part of the name – the generic name – identifies the genus to which the species belongs, while the second part – the specific name or specific epithet – identifies the species within the genus. When using binomial nomenclature What are the […]

What are the 3 components of atmosphere? The permanent gases whose percentages do not change from day to day are nitrogen, oxygen and argon. Nitrogen accounts for 78% of the atmosphere, oxygen 21% and argon 0.9%. Gases like carbon dioxide, nitrous oxides, methane, and ozone are trace gases that account for about a tenth of […]

Which of the following is not a fossil fuel? Coal, oil and natural gas are examples of natural gas. Biogas is the mixture of gases produced by the breakdown of organic matter in the absence of oxygen, usually consisting of certain quantities of methane and other constituents. Therefore, biogas is not a fossil fuel. What […]

Why is bacteria used in recombinant DNA technology? Recombinant DNA technology is used to introduce desired characteristics to organisms. Bacteria are used as models in the recombinant DNA technology due to many reasons such as easy growth and manipulation, rapid cell division, simplicity, ability to select and screen transformants. Why are bacterial plasmids used for […]

What is the definition carrying capacity? Carrying capacity can be defined as a species’ average population size in a particular habitat. The species population size is limited by environmental factors like adequate food, shelter, water, and mates. If these needs are not met, the population will decrease until the resource rebounds. What is the world’s […]