________ produces short sequences of RNA, which allows polymerase to synthesize a new strand of DNA.
A. DNA polymerase
B. DNA helicase
C. DNA topoisomerase
D. DNA primase
E. DNA ligase
Answer: D
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In the primary stage of syphilis, the initial symptom is a small, painless, reddened ulcer called a ________.
Fill in the blank(s) with the appropriate word(s).
Which statement is NOT true?
a. Membranes are often perforated by proteins that extend through both sides of the membrane. b. Some membranes have proteins with channels that allow for the passage of hydrophilic substances. c. Hydrophilic substances have an easier time passing through the lipid bilayer than do hydrophobic substances. d. The current concept of a membrane is best summarized by the fluid mosaic model. e. All of these statements are NOT true
Facilitated diffusion across a biological membrane requires ________ and moves a substance ________ its concentration gradient
A) energy... down B) transport proteins... down C) energy and transport proteins... against D) transport proteins... against
In an unstimulated neuron, the plasma membrane is most permeable to ________ ions
A) sodium (Na+) B) sugar C) calcium (Ca2+) D) potassium (K+) E) chloride (Cl?)