A molecular clock is based on
a. measurement of daylength by pigment complexes.
b. daily changes in amino acid sequence in specialized proteins.
c. regulation of the order in which genes are turned on.
d. precise oscillations of atoms in a crystal.
e. a constant rate of mutation in DNA sequences.
C
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A standardized test that takes into account the fact that some students have access to coaching and others do not assesses
A) global studies. B) global intelligence ability. C) economic stability. D) financial status.
A water-vascular system is characteristic of the phylum ____
a. A water-vascular system is characteristic of the phylum ____. b. Annelida c. Chordata d. Mollusca e. Echinodermata
What is an action spectrum?
What will be an ideal response?
Gary has a kidney stone lodged in his ureter. Where will the radiologist find the kidney stone on an x-ray?
A. Between the bladder and the outside of the body B. Between a kidney and the bladder C. Between a Bowman's capsule and a loop of Henle D. Between the end of a nephron and the renal pelvis