Frage 1
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Which of the following correctly describe(s) the differences between muscle tissue types
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smooth muscle cells may have gap junctions, but skeletal muscle cells never have gap junctions
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skeletal muscle cells contain myofilaments, but smooth muscle does not
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cardiac muscle cells are multinucleate, but smooth muscle cells are uninucleate
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skeletal muscle is voluntarily controlled, but cardiac muscle is involuntary
Frage 2
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Muscle compartments
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are comprised of groups of muscles that work together (synergistically) to produce a movement
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are surrounded by connective tissue called perimysium
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are potential spaces created by interconnected connective tissues that extend from the superficial fascia to the endomysium of the muscle
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support the passage of large blood vessels and nerves supplying skeletal muscles
Frage 3
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Motor neurons that control skeletal muscle
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have cell bodies located in the gray matter of the spinal cord
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have one or more axons, depending on how many muscle cells it innervates
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may be controlled voluntarily or involuntarily
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with all the muscle cells it innervates comprises a motor unit
Frage 4
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All of the required components of a polysynaptic reflex arc in correct sequence are
Antworten
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sensory neuron-motor neuron-effector
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sensory neuron-interneuron-motor neuron
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receptor-sensory neuron-interneuron-motor neuron-effector
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receptor-interneuron-effector
Frage 5
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The skeletal muscle stretch reflex does not result in conscious perception.
Frage 6
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Proteins (choose all that apply)
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may be used by cells to produce ATP
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are built from 20 possible amino acids
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are monomers
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are made by binding amino acids together by the process of dehydration synthesis (aka condensation)
Frage 7
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The functions of proteins in human cells include (choose all that apply)
Frage 8
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The basic unit of life (choose all that apply)
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must be able to respond to short-term changes in its environment and maintain function
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is classified as either carbohydrate, protein, lipid, or nucleic acid
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is able to reproduce itself
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is composed of the same set of chemical elements as non-living things
Frage 9
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One important difference between living and non-living things is
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only living things respond to short-term changes in the environment to maintain function
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non-living things do not absorb the energy of sunlight
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non-living things do not release energy
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carbon is found only in living things
Frage 10
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Which one of the following best describes the metabolism of an organism
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uses up a significant amount of ATP
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the efficient conversion of kinetic energy into potential energy
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includes all the chemical reactions that take place within that organism
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must occur at a constant rate at all times
Frage 11
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Cell membranes are made mostly of
Antworten
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cholesterol
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phospholipids
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proteins
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water
Frage 12
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Enzymes (choose all that apply)
Antworten
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contain covalent bonds between monomers
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catalyze chemical reactions that otherwise would never happen
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are present at all times during the life of a cell
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are manufactured at ribosomes.
Frage 13
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All cells must manufacture proteins, so all cells must have
Antworten
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ATP
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DNA
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ribosomes
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amino acids
Frage 14
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What do atoms form when they share a pair of electrons? (choose all that apply)
Antworten
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molecules
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ions
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covalent bonds
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isotopes
Frage 15
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The attraction of water molecules to each other (choose all that apply)
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makes it easier for water molecules to evaporate
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allows them to dissolve all carbon containing molecules
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is best explained by their tendency to form hydrogen bonds
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helps the body resist changes in temperature
Frage 16
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Nitrogen (N) is much more electronegative than hydrogen (H). Which of the following statements is correct about ammonia (NH3)?
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each hydrogen atom in the molecule has a partial positive charge
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the nitrogen atom has a strong positive charge
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each hydrogen atom has a slight negative charge
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there are hydrogen bonds between the hydrogen atoms of the NH3 molecule
Frage 17
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Which substance is the most basic?
Frage 18
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Chemical buffers help resist an acidic shift in pH by
Frage 19
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ATP (choose all that apply)
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is manufactured by re-arranging the carbon skeleton and other elements in food molecules
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cannot be stored in a cell for future use
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is both used and made in cellular respiration
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is a carbohydrate
Frage 20
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Which of the following cell organelles provide a place for metabolic reactions that either make or use cellular energy?
Frage 21
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Some white blood cells (WBCs) phagocytize invading pathogens, such as bacteria. Which of the following is/are true about this function?
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WBCs manufacture digestive enzymes for intracellular destruction
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Destruction of phagocytized material takes place in the cytosol of the WBC
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Phagocytosis is one form of active transport across the plasma membrane of the cell.
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Lysosomes are unique to some WBCs; not all cells have lysosomes since not all cells phagocytize bacteria.
Frage 22
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Mitosis refers only to nuclear division. Separation of the entire cell into two daughter cells following mitosis is called
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cytokinesis
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mitosis
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meiosis
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karyokinesis
Frage 23
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Phospholipids of the plasma membrane
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are arranged as a bilayer with their polar heads sandwiched between the nonpolar tails
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are arranged in a bilayer with their non-polar tails sandwiched between polar heads
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around a central layer of cholesterol
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prevent the passive transport of most water soluble solutes across the membrane
Frage 24
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An example of a tissue in the body is
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serous membrane
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epithelium
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stomach
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skeletal muscle cell
Frage 25
Antworten
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is diploid
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is the origin of the tissues creating the embryo, but not the tissues that produce the placenta
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implants in the uterus
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is another name for an egg in the ovary
Frage 26
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The process that involves the movement of cells into new relative positions in an embryo
Frage 27
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True or False. Without the formation of ectoderm, the embryo would not develop a nervous system.
Frage 28
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Which of the following is/are true about a lumen in the human body?
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would be lined by an epithelial tissue
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is a space through which light is meant to pass
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is the hollow interior of an organ
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the surface of the body is considered a lumen, since it is covered with epithelial tissue
Frage 29
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The skeletal system functions
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as a boundary organ system, exchanging minerals with the outside environment
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to release calcium and other minerals from the matrix of bone tissue to help maintain homeostasis
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as the only protection for the visceral organs of the abdominal cavity
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produce movement, by providing a framework against skeletal muscle tissues work.
Frage 30
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Compact bone tissue organization
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covers the surface of all bones
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around the medullary cavity of a long bone is surrounded by periosteum and lined by endosteum
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contains osteons
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lacks a direct blood supply
Frage 31
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Which of the following is/are true about bone marrow
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red bone marrow is found in flat bones only
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bone marrow and all bone tissues are derived from endoderm
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red bone marrow produces red blood cells and yellow bone marrow produces white blood cells
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yellow bone marrow contains connective tissues that support the passage of blood vessels and nerves in the medullary cavity of long bones
Frage 32
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True or False. Canaliculi contain blood vessels that supply osteocytes with a means of nutrient and waste exchange.