Which of the following is NOT true of sclerenchyma tissue?
A) It is made up of cells with thickened cell walls.
B) It is a storage site for sugars and starches.
C) It is associated with xylem and phloem in the vascular tissue system.
D) It dies at maturity.
E) It provides support to strengthen the plant.
B
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Hyperthermophilic Archaea have been found to contain dibiphytanyl tetraether lipids. Why are these lipids different from lipids present in non-hyperthermophiles? What special properties and structures do they confer?
What will be an ideal response?
________ causes microtubules to form tight bundles in nerve cells.
A) Dynein B) Actin C) Tau D) Kinesis E) Tubulin
Complementary relationships between purines and pyrimidines
A) allow adenine to form two hydrogen bonds with thymine (or uracil) and guanine to form three hydrogen bonds with cytosine to form double-stranded nucleic acids. B) allow the interaction of the oppositely charged amino acids to form the tertiary structure of proteins. C) allow adjacent bases in a nucleotide chain to stack tightly, stabilizing the DNA double helix. D) provide highly ordered, repetitive bonding to form ? helices and ? sheets within proteins. E) Both A and C are correct.
If a red blood cell is placed in a salt solution and bursts, what is the tonicity of the solution relative to the interior of the cell?
a. hypertonic b. Osmotic c. hypotonic d. Isotonic