Anatomy Ch.3 Cell Biology

The protein-mediated movement of substances across a membrane that requires energy, such as the ATP, is called __________ transport. A.active B.passive

A.active

________ affect(s) the fluidity of the cell membrane by limiting the movement of phospholipids. A.Glycoproteins B.Cholesterol C.Fatty acids D.Carbohydrates

B.Cholesterol

Chemical signal molecules such as hormones, and nervous system cells best represent the cellular activity of __________. A.reproduction B.synthesis of molecules C.energy metabolism D.communication

D.communication

skeletal muscle cells need large numbers of _______ to make the many proteins they contain. A.lysosomes B.centrosomes C.peroxisomes D.ribosomes E.liposomes

D.ribosomes

DNA replication occurs during __________. A.telophase B.anaphase C.the G1 phase of interphase D.the S phase of interphase E.metaphase

D.the S phase of interphase

Insulin hormone is a protein made up of 110 amino acids. Cells in the pancreas are stimulated to secrete insulin when blood glucose levels are increased. Based on this information, ribosomes engaging in insulin synthesis. A.are located in the nucleoli. B.are attached to the endoplasmic reticulum. C.are associated with the Golgi apparatus. D.are free ribosomes in the cytosol.

B.are attached to the endoplasmic reticulum.

Glycolipids consist of lipids and __________. A.cholesterol B.carbohydrates C.proteins D.amino acids E.nucleic acids

B.carbohydrates

Large molecules move across cell membrane with the help or assistance of protein carriers. This type of transport is generically called _______. A.passive transport B.mediated transport C.active transport

B.mediated transport

Imagine a cell membrane that contacts a chemical agent that deforms any proteins present. Which of the following molecules will not be able to cross the membrane? A.Oxygen B.A lipid-soluble hormone C.Glucose D.Water

C.Glucose

The presence of a cellular clock, presence of "death genes," and damage to DNA or mitochondria are all theories of __________. A.cleavage B.death C.aging D.differentiation

C.aging