What is the most probable hypothesis about these intermediate forms of cell division?
A) They represent a form of cell reproduction, which must have evolved completely separately from those of other organisms.
B) They rely on totally different proteins for the processes they undergo.
C) They may be more closely related to plant forms that also have unusual mitosis.
D) They show some but not all of the evolutionary steps toward complete mitosis.
D
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Which hormone from the adrenal cortex of the kidneys will cause the distal convoluted tubules to reabsorb more sodium ions?
A. angiotensin II B. aldosterone C. ADH D. angiotensinogen E. renin
The phylum of animals that does not show true tissues or symmetry is:
A) Cnidaria. B) Porifera. C) Platyhelminthes. D) Annelida. E) Nematoda.
Oxygen has an atomic mass of 16 and an atomic number of 8 . How many neutrons are present?
A. 8 B. 16 C. 4 D. 24
During a muscle contraction, electrical impulses travel to the interior of the cell through ____
a. T-tubules b. endoplasmic reticulum c. troponin d. tropomyosin e. sarcoplasmic reticulum