All of the following are normal microbiota of the skin EXCEPT
A) Streptococcus.
B) Micrococcus.
C) Staphylococcus.
D) Propionibacterium.
E) Corynebacterium.
A
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Which of the following elements of the sliding-filament model of muscle contraction is incorrectly defined?
a) tropomyosin—a regulatory protein b) troponin complex—a set of additional regulatory proteins c) transverse tubules—infoldings of the plasma membrane d) sarcoplasmic reticulum—a specialized endoplasmic reticulum e) calcium ions—ions bound to the myosin protein that play a role in muscle contraction and relaxation
Lack of telomerase activity limits what?
A. the rate of DNA replication B. the number of replication bubbles that form during replication C. the number of times a cell can divide D. the number of Okazaki fragments that can be linked together E. the rate of meiosis
Studies have shown that in the flowering plant Arabidopsis the root-shoot axis is established ____
a. by the first cell division of the embryo b. within hours after the seed germinates c. during the torpedo stage of embryonic development d. shortly after the eight-cell embryo stage e. by plant tissues breaking through the seed coat and making contact with soil
Root hairs:a
protect the delicate cells of the apical meristem. b. help orient the root so it will grow downward. c. increase the capacity of roots to absorb water. d. are sparse and extremely long. e. are located at each node on the root.