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Gametes are produced by the process of a. mitosis. b. meiosis. c. crossing-over. d. replication.

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Conception occurs when the____ gamete fertilizes the ____gamete. female and male or male and female?

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Dna is packaged in the nucleus of the cell in a structure called ________________ in which the dna coils around proteins called histones many times over. when cell replication occurs, the dna condenses even more into a ___________________.

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Cyclins are a family of closely related proteins that a. regulate the cell cycle b. cause cancer c. produce lipids

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(1.01 MC) the study of biology is important because it focuses on.. a) the animals of earthb) the development of human formsc)the interaction of all living thingsd) the function of the human body

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Give an example of how distractions could slow down reaction time

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Positive feedback interactions in Earth’s systems are always a result of human action. True of false?

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During photosynthesis, sugar C6H12O6 is produced from carbon dioxide, water, and sunlight. Which statement BEST explains what happens during photosynthesis? A) Atoms are gained when sugar is formed. B) Single atoms are converted into molecules . C) Atoms from compounds are lost when sugar is formed. D) Atoms of compounds are rearranged to form new compounds.

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Why is so little of Earth’s water available for human use?

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Classify the following relationships as parasitism, commensalism, or mutualism: a shark and a remora fish that cleans and eats parasites from the shark’s gills; head lice and a human; a spiny sea urchin and a tiny fish that hides from predators by floating among the sea urchin’s spines. (this is science)

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At the end of meiosis I each cell has __________ the number of chromosomes as was in the original cell. A. four times B. half C. twice D. three times

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At the end of meiosis I each cell has __________ the number of chromosomes as was in the original cell. A. four times B. half C. twice D. three times

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The Appalachian Mountains are approximately 480 million years old, making them the oldest mountains in North America. The Appalachian Mountains are folded mountains that were once as high as 20,000 feet. Now they reach to about 3,000 feet. How did these mountains form? A) Folded mountains occur when two plates of the Earth’s crust separate. B) Folded mountains are the result of many volcanoes erupting all at the same time. C) Folded mountains form over millions of ears as sediments are deposited and build up. D) Folded mountains occur when two plates of the Earth’s crust push against each other.

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Tourism for wildlife viewing and outdoor recreation can be a welcome source of income for many developing countries. This is sometimes referred to as ecotourism. Make a list of three things you think a country’s government should do in order to make sure that ecotourism does not do more harm than good.

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BIO EXPERTS!! 15 PTS Programmed cell death (apoptosis) is sometimes called “controlled cell suicide.” Explain what happens during this process and discuss TWO specific consequences that could occur if apoptosis did not occur when it should.

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Cellular respiration is a series of complicated reactions. Some of the enzymes that are necessary for the reactions to take place effectively are not produced by the body and must be eaten in a person’s diet. Which answer correctly explains what happens when a person’s diet lacks the necessary enzymes for cellular respiration? A. The production of ATP will increase as the enzyme decreases. B. The cellular respiration reactions will use another available enzyme. C. The cellular respiration reaction rate that uses the missing enzyme will increase. D. The cell’s energy level will diminish as the enzyme decreases.

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Which of the following statements is true? Organisms that evolve in the same environment often have homologous structures. Since there are gaps in the fossil record, it cannot be used as evidence for evolution. Human morphology and embryo development is very different from all other organisms. The more similar the embryonic development of two species, the more closely they are related

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If a Tt plant is crossed with a Tt plant, what is the chance that a tt offspring will be produced? 75% 25% 50% 100%

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Early attempts to develop a geological timescale were based on what

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Which kind of organism is an autotroph?A. consumer B. producer C. decomposer D. herbivore

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Which of these is a disadvantage of multicellular organisms? Cells are able to provide support. They can perform more functions. They can reproduce quickly. They need large amounts of energy.

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DNA is typically found in cells in the form of a very long strand that is coiled many times and contains thousands or millions of nitrogen bases. Which term best describes this very long molecule of DNA?

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State the role of meiosis in humans

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Jane and Jill wondered if the water plants required was related to the temperature of the air around the plants. The girls planted three pots of grass seed. Once the seeds germinated, they placed one pot in the sun, outdoors. They placed the second pot in the shade, outdoors. Finally, they place the third pot in a sunny greenhouse. All conditions were kept constant. The girls did not water any of the pots. They recorded the daily air temperature in all three locations, three times per day: 8:00 AM, 12:00 PM; 4:00 PM. What would be the next logical step in Jane and Jill’s experiment? A) Water the group that is the first to wilt. B) Water the plants in the sunny locations only. C) Record the air temperatures every 30 minutes. D) Check to see which set of plants wilted first.

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Fossils can be formed in the mud because Mud can enclose the dead organism Mud can prevent oxygen from reaching the dead organism Over time mud can harden into rock Mud can be found everywhere

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Photosynthesis is the process by which plants produce food. which catalyst is essential for plants to carry on this process

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In the si system time can be meaasured in _____.

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What is produced during the krebs cycle? co2, atp, nadh, and fadh2 pyruvate, co2, and atp atp, fadh2, and h2o h2o, adp, and nadh

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Which of the following types of cells do not reproduce, and if damaged by injury or disease, are lost forever? answers: skin cells. red blood cells. muscle cells. brain cells.

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The human body can properly function only within a certain temperature range. This tendency toward maintaining a stable internal environment is known as homeostasis.

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