Biology Questions

How is the process of fertilization in animals like the process that takes place in plants? A. A sperm cell and an egg cell combine to form an embryo. B. Sperm is encased in a grain of pollen to travel to an egg. C. Spores can become sperm that will fertilize the egg. D. Self-fertilization is possible if no partner is available.
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In pigs, the allele for a wavy, rough coat (R) is dominant to the allele for a soft, fine coat (r). A rough coat boar and a soft coat sow mate. They produce several litters, 50% are rough coat and 50% are smooth coat. What were the genotypes of the parents?
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The two main types of fermentation are called what
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Earth’s continents are constantly in motion because they sit on top of gigantic plates which float on Earth’s mantle. Energy from the Earth’s core creates convection currents in the molten layer, and the currents move the plates. Over extremely long periods of time, this movement creates new _______. a. biomes b. plates c. atmospheric layers d. elements
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Which statement correctly describes a difference between photosynthesis and cellular respiration? Photosynthesis produces carbon dioxide, while cellular respiration produces water. Photosynthesis produces sugar, while cellular respiration produces oxygen. Photosynthesis produces water, while cellular respiration produces sugar. Photosynthesis produces oxygen, while cellular respiration produces carbon dioxide best answer gets best response
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during the day, when the sun is shining, the ground gets warm mainly as a result of 1. the emission of greenhouse gasses from factories and vehicles 2.heat from Earth's core being conducted to Earth's surface. 3.convection currents in the atmosphere heating the ground. 4.radiated heat from the Sun being absorbed by the ground.
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How does the immune system work together with the circulatory system to function properly? A. Red blood cells released by immune cells cause increased blood flow to the infection site; this increased blood flow brings other red blood cells to the area more quickly B. White blood cells move through the body (to parts where they are needed) in the blood vessels of the circulatory system to destroy pathogens. C. The circulatory system's arteries cause the immune system to work harder by bringing oxygen-depleted blood to the infection site. D. The immune system's red blood cells fig
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Pepsin, a common enzyme found in the stomach, is most active at pH values between 0.5 and 2.5. It works slowly between pH values of 2.6 and 3.4. Beyond a pH of about 3.5, it becomes completely inactive. Why does this happen? A) The enzyme inactivates because it melts into a liquid when it is not at the right pH. B) The protein chain in the enzyme is denatured, permanently inactivating it as the pH approaches 7. C) The enzymes slow down, because changing the pH changes the temperature as well, and affects the reaction.
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One trait a plant can have is either red leaves (R) or brown leaves (r). Another trait is tall stems (T) or short stems (t). A plant used in a dihybrid cross has the genotype RrTt. What is the phenotype of this plant?
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One concern that arises from building a dam is that fish are not able to migrate. One way that fish can gain passage to their destinations is by: Select one: a. fish ladders b. fish trucks c. fish boxes d. fish escalators
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In which situation is the object experiencing balanced forces? A) A girl swings on a swing at the playground. B) A car brakes as it approaches a traffic light. C) A sled speeds up as it slides down a snow-covered hill. D) A sky diver reaches terminal velocity when he stops accelerating.
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If an organism is composed of only one cell, it ___________. performs all of the functions is specialized does not have any functions cannot survive on its own
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Select all that apply. Factors that can increase mutation rates are _____. high temperatureslow temperaturesfood additivesUV rays
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Red green and blue light rays each enter a drop of water from the same direction which light ray's path through the drop will bend the most and which will bend the least why?
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Which geologic period lasted for almost 7/8 of earth’s history?A.the Precambrian timeB.the Quaternary PeriodC.the Carboniferous PeriodD.the Phanerozoic Eon
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Early in mitosis, the nucleus, nucleolus, and nuclear envelope begin to dissolve in preparation for cell division. In which stage of the cell cycle is this process reversed?
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explain why the direction along which the electromagnetic wave travels is not the same as the direction along which the changing electric field is applied.
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Many energy sources use turbines to generate electricity. What is one type of energy source that does not use turbines? A. Coal B. Hydroelectric C. Wind D. Solar
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