Q: Cell transport refers to the movement of substances across what structure? Read this paragraph and choose the correct option from the provided answers: Cell transport refers to the movement of substances across the cell membrane. Probably the most important feature of a cell's phospholipid membranes is that they are selectively permeable. A membrane that is selectively permeable , or semipermeable, has control over what molecules or ions can enter or leave the cell, as shown in Figure below . This feature allows a cell to control the transport of materials, as dictated by the cell's function. The permeability of a membrane is dependent on the organization and characteristics of the membrane lipids and proteins. In this way, cell membranes help maintain a state of homeostasis within cells (and tissues, organs, and organ systems) so that an organism can stay alive and healthy. Choices: - cell wall - chloroplasm - phloem - cell membrane A:
cell membrane
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Q: What plastid makes and stores other pigments? Read this paragraph and choose the correct option from the provided answers: Chromoplasts are plastids that make and store other pigments. The red pigment that colors the flower petals in Figure above was made by chromoplasts. Choices: - pores - pores - sporozoans - chromoplasts A:
chromoplasts
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Q: What process that begins in utero during fetal development and continues on into adolescence involves closing of the skull? Read this paragraph and choose the correct option from the provided answers: Intramembranous ossification begins in utero during fetal development and continues on into adolescence. At birth, the skull and clavicles are not fully ossified nor are the sutures of the skull closed. This allows the skull and shoulders to deform during passage through the birth canal. The last bones to ossify via intramembranous ossification are the flat bones of the face, which reach their adult size at the end of the adolescent growth spurt. Choices: - incubation - elongation - calcification - ossification A:
ossification
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Q: What drives puberty in male humans? Read this paragraph and choose the correct option from the provided answers: Another obvious change that occurs during puberty is rapid growth. This is called the adolescent growth spurt . In boys, it is controlled by testosterone. The rate of growth usually starts to increase relatively early in puberty. At its peak rate, growth in height is about 10 centimeters (almost 4 inches) per year in the average male. Growth generally remains rapid for several years. Growth and development of muscles occur toward the end of the growth spurt in height. Muscles may continue to develop and gain strength after growth in height is finished. Choices: - bloodstream - estrogen - methane - testosterone A:
testosterone
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