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Biology answers to 126 questions

Answer: 1. right atrium Blood is transported into the heart via the inferior and superior vena cava — two large veins that pump deoxygenated blood into the heart. The superior vena cava empties this deoxygenated blood into the right atrium,…
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Answer: b. millions There are more than one trillion cells in the human body. These cells include the nerve cells or neurons which conduct nerve impulses and the glial cells in the nervous system which support the neurons. The human…
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Sensory memory At every stage in the life of a living organism, its sensory receptors record sensory information that is transmitted to the brain via the nervous system. This kind of information is stored in sensory memory and moves to…
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Answer: C. They have two germ layers. The phylum Porifera consists of the sponges. They are organisms that possess both the ectoderm and endoderm layers. That means that they have two germ layers. In the options provided above, the third…
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Answer: D. Ground Beef should be stored above Chicken In the storage of food items in a refrigerator there are specific protocols that should be followed. Already-made foods are stored on the topmost section of the refrigerator. The second section…
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Answer: The correct answer is A. Seed cones contain ovules. The Gymnosperms are plants whose seeds are not covered in an ovary. They are seed-producing plants with conifers and cycads being two popular gymnosperms. The seeds of gymnosperms are not…
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Answer: C. enhanced ability of the organism to reproduce A balance in the number of chromosomes in humans is extremely important. If not, certain abnormalities may occur. Chromosomes carry our genetic material responsible for controlling body cells. An alteration in…
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Answer: False The Body Mass Index (BMI) of a healthy female is below 30 — with a higher range of 24. If a woman has a body fat of 30%, her Body Mass Index is 30. This means she is…
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Answer: 3. Larval urochordates and adult cephalochordates Urochordata and Cephalochordata are the two subphylums of Chordata. Urochordata are living organisms that have a notochord present in the posterior part of their body that forms a tail at their larval stage.…
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Answer: 2. Elongated sporophyte The division of Bryophyta consists of three different types of bryophytes. The bryophytes include the hornworts, the liverworts, and the mosses. Although all plants under the division Bryophyta are non-vascular, they have unique features that separate…
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Answer: B. An increase in fluid taken by mouth would reduce the amount produced by metabolism. The other statements are correct except this one. This is because the amount of fluid or water produced through metabolism is totally independent of…
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Answer: B Adaptations occur due to evolutionary factors. Evolution is the biological change a species undergoes over a very long time frame. The mutation of genes is the main reason why adaptation happens. Mutation can be highly beneficial for animals…
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Answer: 1,3,4 Involution is simply the transition or change of form and size of an organ from its newer size to its previous or initial size. This phenomenon is often observed at the cellular level of life and occurs as…
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Narcotics are known to be one of the most effective painkillers in the world. It is often legally given to patients who are experiencing great levels of pain. In certain situations, narcotics may be the only option for alleviating severe…
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True Succession occurs after ecosystems experience some type of disruptive event Ecological succession is the steady and gradual change in a species of a particular area concerning changes in the environment. When the change in the ecosystem is disruptive, the…
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Answer 1. The research done by Gregor Mendel formed the basis of the field of genetics. Genetics is the study of heredity in general and of specific genes. Genetics is one of the central pillars of biology. And it is…
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True. Ectomorphs are people who were born looking long and lean. Their body length is usually long in proportions. They are slender, and they find it difficult to gain weight no matter the diet they are placed on. Most full-body…
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In a protein, there are 4 different levels or types of structures: the primary, secondary, tertiary, and quaternary structures. The secondary structure of a protein is the formation of either a beta helix an alpha helix, or a random coil…
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Plants need carbon dioxide, and the way they absorb it from the environment is with the help of their leaves. On the underside of a leaf, there are countless tiny holes called the stomata. The carbon dioxide that a plant…
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In humans, there are 3 different blood types: A, B, and O, and each one of these blood types have a different allele. For the A and B blood types, the alleles that code for each one of them are…
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The heart is a muscular organ in the body that pumps blood throughout the body. It is divided into 4 chambers, the right atrium, the left atrium, the right ventricle, and the left ventricle. The upper chambers of the heart…
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In the circulatory system of living organisms, the most common case is of oxygenated and deoxygenated blood in the heart, flowing or being carried in separate channels or paths. This, however, is not the case for all living organisms, as…
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Previously, enzymes were thought to all be made of proteins, or proteinous in nature, however, it has been shown that not all enzymes are actually proteinous in nature. Enzymes are more accurately defined as biological catalysts that act on chemical…
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Genetic variation is the term used to describe differences in the DNA sequences of people. These differences can either be enhanced or reduced, based on specific factors. One factor that is most likely to decrease genetic variation is stabilizing selection.…
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All living things have their own lifecycle, depending on various contributing factors. The life span of an unfertilized egg is about 24 hours (a day). Prior to this time, an egg is released by the ovary every month and is…
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The nucleosome is the simplest structural unit of DNA packing, and the core is made up of proteins. The nucleosome core is made up of 8 different histone proteins, arranged in different patterns, around which Aa DNA segment is wrapped…
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The cardiac cycle is made up of 4 different stages through which blood flows to and from the heart. Each stage is characterized by movements of the tissues of the heart either in the opening, filling, closing, or emptying the…
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Depending on the location or type, each human cell has a specific number of chromosomes. Generally, humans are known to have a diploid number of chromosomes (46), except the gametes (23 chromosomes). All somatic cells are strictly diploid, and so…
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Mammals are distinct animals that possess backbones, a constantly warm internal temperature, hairs, or furs on their skins, have 4 chambered hearts, and feed their young with milk. These characteristics however are not all entirely unique to mammals, as other…
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While it is commonly believed that the more complex an organism, the more complex the arrangement or organization of internal organs, earthworms are different. Though not as complex as humans, an earthworm has five different hearts. The hearts, however, referred…
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