Which of the following is not true of an organism's genotype?
A. It contains structural genes that code for proteins.
B. It has expressed traits governed by the genes.
C. It contains genes that code for RNA.
D. It has regulatory genes that control gene expression.
E. It is inherited.
Answer: B
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The accumulation of free oxygen in the
atmosphere a. was a result of the accumulation of a byproduct of a type of photosynthesis. b. prevented the further spontaneous generation of life. c. provided the opportunity to extract more energy through aerobic respiration. d. did not occur immediately after the earth was formed. e. did all of these.
Giant viruses are challenging the historical notion that viruses are nonliving things. What characteristic do giant viruses possess that make scientists think twice about their classification?
A. They have the ability to form conglomerates of virus particles that work together, similar to how groups of cells work together as tissues. B. They have the ability to reproduce independently without a host cell. C. They have the ability to manufacture their own proteins without the help of a host cell. D. They are large in size, similar to prokaryotic cells.
________ are the nerve cells of the body.
Fill in the blank(s) with the appropriate word(s).
Keratin filaments are anchored to junctions called
a. adherens junctions. b. tight junctions. c. desmosomes. d. gap junctions. e. neuromuscular junctions.