A bond that joins atoms that have opposite charges is a(n)
a. covalent bond.
b. hydrogen bond.
c. ionic bond.
d. coordinate covalent bond.
e. polar covalent bond.
C
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Which of the following about soil with low pH is false?
a. Aluminum is more soluble. b. Calcium phosphate becomes less soluble. c. Acidic soil can be found in Pygmy forest in California. d. Potassium is leached more readily from the soil. e. Manganese may be available in toxic concentrations.
The vegetal pole of a frog zygote differs from the animal pole in that _____
A) the vegetal pole has a higher concentration of yolk B) the blastomeres originate only in the vegetal pole C) the vegetal pole cells undergo mitosis, but not cytokinesis D) the polar bodies bud from this region
Thick filaments are composed primarily of ________, whereas thin filaments consist of ________
A) T tubules; Z discs B) actin; myosin C) myosin; actin D) Z discs; T tubules
Select the structures that are found in plant cells.
a. Plasma membrane
b. Central vacuole
c. Chloroplast
d. Mitochondrion
e. Cell wall