The portion(s) of an action potential where the
sodium gates are open is(are) indicated by
a. A.
b. B.
c. C.
d. D.
e. A and B.
E
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What is the minimum number of aminoacyl-tRNA synthetase enzymes needed to attach amino acids to all the various tRNA molecules?
A. 61 B. 20 C. 64 D. As many as there are different tRNAs.
In vascular plants, water transport only works if ___________. (Select all correct answer options.)
A. roots are able to generate turgor pressure B. the water column is continuous between leaves and soil C. H2O evaporates from leaves D. xylem and phloem are in close proximity
Which two organisms should be used to determine the validity of urea agar for quality control purposes?
a. P. fluorescens and B. cepacia complex b. Ralstonia mannitolilytica and Acidovorax delafieldii c. Brevundimonas diminuta and Brevundi-monas vesicularis d. B. vesicularis and R. pickettii
When Griffith experimented with two types of Streptococcus pneumoniae, he found that if the
A) non-deadly strain was mixed with the heat-killed, deadly strain before injection, the mice died. B) non-deadly strain was mixed with the heat-killed, non-deadly strain before injection, the mice died. C) deadly strain was heat-killed before injection, the mice died. D) non-deadly strain was mixed with the heat-killed, deadly strain before injection, the mice lived.