13240197
Descripción
Test por Karen Deseo, actualizado hace más de 1 año
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Creado por Karen Deseo
hace más de 6 años
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Pregunta 1
Pregunta
Membrane phospholipids
Respuesta
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have hydrophobic heads that face the centre of the membrane and are shielded from water.
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have hydrophilic tails that face outward and are exposed to water.
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are able to drift about in the plasma membrane
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remain fluid because they are tightly packed against one another.
Pregunta 2
Pregunta
A hypothesis is
Respuesta
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the same as a theory
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a proposed explanation for a set of observations
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an explanatory idea that is broad in scope and supported by a large body of evidence
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a widely accepted idea about a phenomenon
Pregunta 3
Respuesta
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all environments on earth supporting life
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savannah
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all organisms in the savannah
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group of cheetahs
Pregunta 4
Pregunta
Which of the following organisms belongs to the group represented in Box 1?
Image:
Image (binary/octet-stream)
Respuesta
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giraffe
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tree
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decomposing bacteria
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leopard
Pregunta 5
Pregunta
Which of the following statements regarding a common cellular activity is false?
Respuesta
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cells respond to the environment
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cells develop and maintain complex organization
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cells regulate their internal environment
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new cells are derived from cellular components like organelles
Pregunta 6
Pregunta
You notice that over the past month, many students on campus have started wearing a new style of school sweatshirt. You think to yourself that perhaps the bookstore has recently started selling this new sweatshirt style. This prediction is an example of
Respuesta
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an experimental question.
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a type of observation.
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a hypothesis.
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an experiment.
Pregunta 7
Pregunta
Which of the following is a trace element in the human body?
Respuesta
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nitrogen
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zinc
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oxygen
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hydrogen
Pregunta 8
Pregunta
What is the atomic mass of an atom that has 6 protons, 6 neutrons, and 6 electrons?
Respuesta
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6
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8
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12
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18
Pregunta 9
Pregunta
A hydrogen atom has one electron. How many covalent bonds can hydrogen form?
Respuesta
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one covalent bond
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two covalent bonds
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four covalent bonds
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no covalent bonds
Pregunta 10
Pregunta
Household ammonia has a pH of 12; household bleach has a pH of 13. Which of the following statements about them is true?
Respuesta
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Both of these substances are strong acids.
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The ammonia has 10 times as many OH- ions as the bleach.
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The ammonia has 10 times as many H+ ions as the bleach.
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A solution that could buffer the bleach and ammonia would remove excess OH- ions.
Pregunta 11
Pregunta
________ are weak bonds that are not strong enough to hold atoms together to form molecules but are strong enough to form bonds within and around large molecules.
Respuesta
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ionic
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covalent
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polar covalent
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hydrogen bonds
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