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Biology answers to 194 questions

Answer: A. eukaryotes. Prokaryotes are unicellular organisms with no nuclear membrane-enclosed nucleus. These organisms are believed to be the origin of life and to have dominated the earth up to the Precambrian era. Prokaryotes, cells with a membrane-bound nucleus originate…
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Answer: B. Brain wave associated with sleep spindles. Theta waves are brain waves that occur just when you are asleep or dreaming. These waves do not occur during the deepest of sleep but occur during light phases or just before…
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Answer: C. Suprachiasmatic nucleus The suprachiasmatic nucleus, also known as the SCN, is a bilateral structure found in the anterior region of the hypothalamus of the brain. It is the controller of the circadian timing system responsible for all the…
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Answer: C. perennials Perennials are plants that will thrive for many growing seasons. A typical perennial has a life span of more than two years. These plants will survive any season and will persist year in year out. Most perennials…
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Answer: D. Cartilaginous joints where hyaline cartilage unites the ends of bones Synchondrosis is a type of cartilaginous joint where bones are completely joined together or united by hyaline cartilage. Synchondroses are immovable joints and are therefore described as synarthroses.…
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Answer: A. Plants use CO2 but do not release any, thus maintaining a balance of CO2 in the atomsphere. Plants are autotrophs and this means they are capable of manufacturing their own food. This process is known as photosynthesis. In…
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Answer: A. Bioelectrical impedance machine The bioelectrical impedance machine is the most accurate medium of measurement used today in the measurement of body fat. This machine is very efficient as it helps in measuring the exact amount of body fat…
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Answer: C. heart-arteries-capillaries-veins-heart Pulmonary circulation entails how blood is moved between the heart and the lungs. Deoxygenated blood is transported to the lungs so as to get them to absorb oxygen and release carbon dioxide. This oxygenated blood then moves…
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Answer: A. cocci. Spherically shaped bacteria are known as cocci (singular coccus). A coccus, therefore, is any bacteria having an ovoid, spherical, or a round shape in general. Generally, bacteria are classified based on their shape into three classes; the…
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Answer: B. Vertebral column The appendicular skeleton consists of bones that function in supporting the appendages. This portion of the skeletal system includes the framework of the limbs, the pelvic girdle, and the shoulder girdle. The seven bones of the…
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Answer: A. stores DNA The nucleus is in charge of regulating and controlling all activities done within the cell. It carries the genes and structures containing important hereditary information. Being the most prominent and largest organelle in the cell, the…
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Answer: C. carries the water-soluble nutrients Fat is used by the body as a source of fuel. Of the options listed, option C is not a function of fat in the human body as fats are not carriers of water-soluble…
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The masseter is the strongest muscle in the body and it is one of the muscles used for mastication. As a distinct feature differentiating it from other masticatory muscles, it helps in the elevation of the mandible and also in…
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The pericardium is a double-walled sac in which the heart is enclosed. it surrounds the heart, therefore, acting as a form of protection to the heart. It also helps in lubricating the heart and keeping it in place within the…
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The scientific name for modern humans is Homo sapiens. This name was coined in the year 1758 by Carl Linnaeus. The term “Home sapiens” is derived from the Latin word which means wise human. Generally, according to the rules of…
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Bile is a fluid produced in the liver and stored in the gallbladder. It helps in digestion and also in breaking down fats into fatty acids, which is then taken by the digestive tract into the body. Bile flows from…
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Answer: D.the pelvis Bones of the axial skeleton in humans include the skull, the middle ear, the ossicles, the hyoid bone, the rib cage, the sternum, and the vertebral column. The full human skeleton is a combination of the axial…
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Answer: B. haploid cells In meiosis, a single diploid cell divides twice to produce four haploid cells, each containing half the amount of genetic information. In mitosis, however, a single cell divides, giving two identical diploid daughter cells, with each…
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Answer: C. help control body temperature. The cardiovascular system consists of the heart, together with a closed system of vessels which includes the veins, arteries, and capillaries. The capillaries are the most numerous of the blood vessels and they help…
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Answer: C. Transporting respiratory gases The lymphatic system is a part of the immune system, important for the cleaning within the fluids of the body. It also helps in producing an immune response to a certain disease. The lymphatic system…
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Answer: A. If populations can interbreed, they are considered one species. Reproductive isolation is required for speciation to occur as it involves all of the mechanisms involved in evolution, including the behaviors and the physiological processes necessary for speciation. In…
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There are several structures and organelles found in a typical plant cell but not found in an animal cell. Some of these structures include the cell wall, chloroplasts, and large vacuoles. Although plant cells and animal cells still have some…
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Answer: B. Compare the length of DNA among members of a species With modern taxonomy, both the internal and external structures of an organism can now be studied and this is important in getting information regarding certain organisms related to…
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Answer: C. ribosomes The ribosomes can be found in the endoplasmic reticulum. There are two types of endoplasmic reticulum; they are the smooth endoplasmic reticulum and the rough endoplasmic reticulum. The ribosomes are found on the latter. The ribosomes are…
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Answer: C. happens daily Circadian rhythms are processes that occur in a 24-hour cycle. A good example of a circadian rhythm is the appearance of fireflies at dusk because it happens daily, at a specific time. The time frame between…
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Answer: True. By phagocytosis, amoebas are capable of feeding and this is a very useful mechanism in the general feeding structure of the amoeba. Amoebas are non-selective in their general nutrition as they will literally eat whatever they can. Generally,…
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Answer: B. tracking caloric intake A person who desires to lose weight in a healthy manner should focus on total calorie intake by intentionally cutting the number of calories consumed per day. Keeping a record of the calorie intake of…
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Answer: C. Adaptive evolution is a fluctuating change in a trait. As a result of our ever changing environment, adaptive evolution leads to a fluctuating change in traits. With evolution leading to changes in organic matter over time, adaptive evolution…
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Answer: A. Other living things cannot use atmospheric nitrogen. The nitrogen cycle involves a series of mechanisms leading to the interconversion of nitrogen and nitrogenous compounds gotten from the atmosphere. In the nitrogen cycle, bacteria are very important because atmospheric…
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Answer: D. creating amino acids Amino acids are the building blocks of proteins. A typical amino acid structure consists of a central carbon atom covalently bonded to a carboxyl group, an amino group, and a hydrogen atom. When numerous amino…
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