Tubular secretion occurs in the region labeled____
a. 1 only
b. 2 only
c. 3
d. 4
e. 1 and 2
ANSWER: c
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According to the central dogma, what molecule should go in the blank? DNA ? _____ ? Proteins
A) mtDNA B) rRNA C) mRNA D) tRNA
Which of the following statements is not true about phloem transport of sugars?
A. Active transporters move the sucrose into the phloem. B. Removing sugars from phloem increases turgor pressure at the sink. C. Increased sugar concentration causes water to flow into the sieve tube. D. Sugars are transported out of the phloem at the sink. E. Loading of sugars at the source is powered by ATP.
Which of the following changes might cause algal toxin levels to fluctuate?
A) Exposure to sun B) Water depth C) Minerals available D) Temperatures E) All of the above could cause algal toxin levels to fluctuate
Contains osteocytes surrounded by hard matrix.