What is the genetic material of all known organisms and viruses?
a. always DNA
b. always RNA
c. always nucleic acid
d. protein
e. None of the above
Ans: c
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In a given mapping experiment, you expect that incidence of double crossovers is 3.5%, but you only observe 2.5%. This can be explained by ________________
A. Interference B. Linkage C. Coincidence D. Segregation
Adjacent animal cells utilize ____ to rapidly communicate with each other
a. gap junctions b. plasmodesmata c. hormones d. desmosomes e. neurotransmitters
A stem cell is a cell that ____
a. can differentiate into specialized cell types b. has already differentiated c. can develop into two or three cell types d. can only develop into skin cells e. can only develop into bone cells
50% of the male sex chromosomes
a. are Y. b. are X. c. are XY. d. are either X or Y. e. are none of these.