Which one of the following is absolutely necessary for diffusion to occur?
a. a living cell
b. a phospholipid bilayer
c. a selectively permeable membrane
d. a concentration gradient
e. a solution
D
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Review the experiment illustrated in Figure 8.7
Experiment #2 and on what you know about photosynthesis, which of the 2-D paper chromatography patterns below would be observed if the cells treated with C14 had been allowed to remain in culture for a longer period of time before they were put in the boiling alcohol? What will be an ideal response?
Which tissue acts to transport nutrients and wastes throughout the body?
a. blood b. adipose tissue c. loose connective tissue d. fibrous connective tissue e. cartilage
The stages of meiosis I are virtually the same as the stages of mitosis. The one major difference is ____
a. the homologous chromosomes line up opposite each other during metaphase b. there is no anaphase in meiosis I c. there is no prophase in meiosis I d. the homologous chromosomes line up next to each other during metaphase e. the homologous chromosomes line up at opposite ends of the spindle equator
What is an ADVANTAGE of asexual reproduction?
A.) it produces genetically identical organisms B.) there is no genetic variation C.) reproduction can occur quickly D.) organisms cannot grow very large