The neural plate forms from which type of tissue?
a. ectoderm
b. endoderm
c. mesoderm
d. chorion
e. amnion
ANSWER: a
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If human white blood cells were extracted from the circulatory system and then placed into an isotonic solution, which one of the following is most likely to occur?
A) Water will rush into the cells, and the cells will swell and eventually burst. B) Because there is more water outside the cell than inside the cell, an equal amount of water will enter the cell and leave the cell. C) There will be no change in the cells because the isotonic environment is in equilibrium with the cells. D) Because a hypertonic environment is highly acidic, these cells will become acidic as well. E) Water will diffuse out of the cells, and they will decrease in cell volume.
Protein families contain proteins with identical primary, secondary, and tertiary structures.
a. true b. false
When one plant is shaded by another, why is the ratio of far-red to red light increased compared to an unshaded plant?
A. Auxin absorbs mostly far-red light. B. Shade is enriched in far-red wavelengths of light. C. Phytochrome in the taller plant absorbs most of the red light. D. Far-red light mostly reflects off the surface of the soil while red light is mostly absorbed. E. As light passes through the leaves of the taller plant, most of the red light is absorbed by chlorophyll.
You will not observe __________ in animal cells.
A) mitochondria B) a plasma membrane C) ribosomes D) a cell wall