Biology, 13.03.2020 21:35 elizabethwaller8104
A researcher growing cells in culture observed that the cells always divided once they reached a certain size. When she added more nutrients to the culture medium or adjusted the temperature of the growing chamber, the cells grew at different rates but always divided once they reached a certain size. Which statement explains these observations?a. As they grow, cells require greater and greater quantities of nutrients from the environment, and they must reduce this requirement by dividing. b. The increasing surface area of a cell as it grows larger increases the risk that small molecules that can harm the cell will pass from the environment into the cell interior. c. Efficiency of transport of materials within a cell decreases with size, thus limiting the maximum cell size. d. The cell’s surface area increases faster than its internal volume as it increases in size, and this leads to an inability of the cell to feed itself.
Answers: 3
Biology, 22.06.2019 05:00
Freckles are a dominant trait in humans. both of the girls have the genotype ff for freckles. if either one marries a man with no freckles, what are the chances that their children will have freckles?
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Biology, 22.06.2019 06:10
The normal shape of an enzyme is as shown in structure a. if the enzyme’s shape changes to that shown in structure b, what are two consequences of this change?
Answers: 1
Biology, 22.06.2019 08:40
What best explains whether bromine (br) or neon (ne) is more likely to form a covalent bond? bromine forms covalent bonds because it has seven valence electrons, but neon has eight valence electrons and already fulfills the octet rule. bromine forms covalent bonds because it has many electron shells, but neon has only two electron shells and is tightly bound to its electrons. neon forms covalent bonds because it can share its valence electrons, but bromine has seven valence electrons and can gain only one more electron. neon forms covalent bonds because it has only two electron shells, but bromine has many electron shells and will lose electrons in order to fulfill the octet rule.
Answers: 3
Biology, 22.06.2019 10:30
10. in which phase will crossing-over occur? a. mitosis b. metaphase ii c. prophase i d. meiosis ii
Answers: 1
A researcher growing cells in culture observed that the cells always divided once they reached a cer...
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