Which of the following traits of complex multicellular organisms is also shared by some simple multicellular organisms, but not by single-celled organisms?
A. plasmodesmata
B. adhesion
C. cell signaling
D. bulk transport
E. None of the answer options is correct.
A
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Most cases of red-green colorblindness are inherited as an X-linked recessive characteristic. Which of the following are possible if a woman, who is a carrier for colorblindness, has offspring with a male who is colorblind?
a. All their sons will have normal color vision. b. All their sons will be colorblind c. All their daughters will be colorblind. d. All their daughters will have normal vision. e. All of the above are possible.
The gradient distributions of alleles across continents reflect _____
a. the delineation of new races b. genetic drift c. human migration patterns d. protective alleles e. natural selection
Which of the following does not change the amount of genetic material on a chromosome?
A: A deletion B: An inversion C: A duplication D: A translocation E: All of the above change the amount of genetic material on a chromosome.
In knockout experiments, _______________.
A. genes are added to chromosomes B. normal genes are replaced physically by mutated genes C. genes are mutated or deleted to prevent their expression D. mRNAs are prevented from attaching to ribosomes E. the protein products of specific genes are inactivated