The right response is A. Four nucleotides—adenine (A), guanine (G), cytosine (C), and thymine (T)—store the information in DNA. Thymine and cytosine are categorized as pyrmidines, while the nucleotides adenine and guanine are purines. Pyrimidines have one carbon nitrogen base and purines have two carbon nitrogen ring bases. The mnemonic "GCAT PuPy PuPy" makes it simple to recall these nucleotides because "G" and "A" correspond to "Pu" (purine), while "C" and "T" correspond to "Py" (pyrimidine). Uracil (U) replaces thymine in RNA, which is remembered as "GCAU PuPy PuPy."
The right response is D. The number of protons and neutrons inside the nucleus must be added in order to determine the atomic mass. The electron does not add to the mass of the atom because it is much less than both the proton and the neutron. The resulting atomic mass of 79 is the result of adding 42 protons and 37 neutrons.
The right response is A. In addition to regulating metabolism, growth and development, tissue function, sexual function, reproduction, sleep, and mood, the endocrine system is a collection of glands. Another key clue in this issue is the word "Regulating."
The right choice is C. Part of the light is absorbed and some is reflected when it strikes an item. How our eyes see the color is based on the wavelengths that are reflected. Because those wavelengths are reflected and not absorbed, we see a red dress as red.
The right response is C. Kingdom, Phylum, Class, Order, Family, Genus, and Species are listed in order of taxonomic importance from largest to smallest. Family is the next-smallest after Order. King Philip Came Over for Great Spaghetti is a helpful mnemonic for recalling information.
The right response is B. The respiratory and digestive systems both include the pharynx. The throat is the area of the body between the base of the skull and the sixth cervical vertebra.
The right response is B. An object's momentum is equal to its mass multiplied by its velocity. The choice that generates the most momentum is 9500 x 200, or 1.9 million.
The right response is D. Only in the presence of substantial air resistance would heavier objects free-fall more quickly than lighter ones. The rate of acceleration would be the same for an elephant and a penny falling freely in a vacuum, therefore they would both descend at 9.8m/s2, the acceleration caused by gravity.
The right response is D. As toxic substances increase, living organisms may decrease. This would be an inverse relationship with no normal distribution. The remaining data would have a normal distribution.
The right response is A. Isotopes are determined by neutron counts. The number of electrons defines whether the atomic particle has a positive, negative, or neutral charge, whereas the number of protons determines which element it is.
The right response is C. An "independent variable" is a part of an experiment that the scientists can control. The result or impact is represented by a "dependent variable." The light is an independent variable because it is managed by the experimenters.
The right response is B. RNA is not stable in alkaline conditions, but DNA is (as RNA has an –OH instead of an H, as in DNA).
The right response is D. A catalyst is an enzyme that helps reduce the amount of energy needed to start a reaction. In light of this, adding a catalyst to a chemical process will speed up the reaction's progress. A decrease in the energy required to initiate the reaction suggests that the reaction will occur more quickly.
The right response is A. A cell's cytoplasm contains an organelle known as the Golgi body, or simply the Golgi. Despite being near to other organelles, it is situated separately in the cytoplasm.
The right response is C. Before the exosphere, where molecules from the atmosphere float through space, the thermosphere is the highest point in the atmosphere.
The ideal solution is A. Above the small intestine is the stomach. In anatomy, "superior" is a term for "upper" or "above."
The right response is B. The tissue that performs the specific function of an organ and makes up the majority of the organ is known as the parenchyma. The epithelial, neural, connective, and muscular tissues are the four fundamental forms of tissue.
The right response is C. Eukaryotic cells have mitochondria, a nucleus, lysosomes, and several chromosomes, which differentiates them from prokaryotic cells.
The right response is A. A strong correlation exists when one factor significantly influences the other. There is an inverse link between the salmon population and the population of invasive species because the salmon population declines as the invasive species numbers increase.
The right response is D. After telophase, a cell splits into two during a process called cytokinesis. While in animals it includes the production of a cleavage furrow, it involves the formation of a cell plate in plants.
The right choice is A. The amount of energy that moves from a lower trophic level to a higher trophic level always decreases. Consumers with higher trophic levels have less energy. The energy available to primary consumers is more than what is available to secondary and tertiary consumers.
