Which of the following statements about the enzymes is FALSE?
A. Enzymes increase the rate of the reactions
B. Enzymes are made of protein, but some enzymes have non-protein components as well
C. Each enzyme carries a specific function
D. Enzyme activity is affected by substrate concentration
E. Enzymes increase the activation energy
Answer: E. Enzymes increase the activation energy
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Certain plants that grow in environments where their roots are often under water need to provide ways of getting which of the following to the roots?
A. carbon dioxide B. carbon monoxide C. hydrogen D. nitrogen E. oxygen
Match the cell adhesion or junction on the left with the appropriate choice on the right.
A) protein subunits associated with gap junctions B) a type of adhesive junction connecting an epithelial cell to the basal lamina C) collection of fibrous intracellular attachment proteins D) create a permeability barrier E) button-like points of strong adhesion between two cells F) hollow cylinders associated with gap junctions G) type of adherens junction connecting cells with the extracellular matrix H) intermediate filaments associated with plaques I) collection of adherens junctions particularly associated with epithelial cells J) type of adhesive junction containing actin microfilaments K) specialized modifications of the cell membrane in which two cells come together in multicellular organisms L) point of cytoplasmic contact between two cells M) anchors cytoskeleton of one cell with that of a neighboring cell 1) adherens junction 2) desmosome 3) cell junctions 4) connexons 5) plaque 6) tonofilaments 7) hemidesmosomes 8) adhesion belt 9) adhesive junction 10) tight junctions 11) connexin 12) gap junction 13) focal contact
A mollusk radula is which of the following?
a. foot b. feeding organ c. ear d. sensitive hair e. balance organ
An effector can be a
a. muscle. b. nerve. c. gland. d. receptor. e. both muscle and gland