Which of the following is NOT true of hydrogen bonds?
a. They are quite weak.
b. The hydrogen is slightly positive.
c. They are common in macromolecules.
d. They are difficult to form and break.
e. They always involve hydrogen.</p>
Ans: d. They are difficult to form and break.
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In chordates, which mesoderm structure forms during gastrulation and provides structural rigidity along the dorsal anterioposterior axis of the embryo?
A. Archenteron B. Neural tube C. Notochord D. Epidermis E. Intestinal tract
The stage of mitosis when chromosomes condense to form rod-shaped structures visible under the microscope is called
A) interphase. B) prophase. C) metaphase. D) anaphase. E) telophase.
What does antidiuretic hormone do?
a. increases glucose reabsorption b. decreases the filtration rate c. increases tubular secretion d. increases water reabsorption e. decreases amino acid reabsorption
Carbon is released into the atmosphere as carbon dioxide through the process of
A) photosynthesis. B) primary production. C) respiration. D) fixation.