Choose the true statements about the evolution of complex characters, such as powered flight.
A. The intermediate stages in the evolution of a complex character had no fitness advantage.
B. Often the initial stage in the evolution of a complex character was an adaptation to some unrelated selection pressure.
C. Phylogenetic analysis using cladistics can help reveal the sequence leading to the evolution of a complex character.
D. Usually a single mutation in one gene leads to the simultaneous appearance of the complex character.
Ans:
B. Often the initial stage in the evolution of a complex character was an adaptation to some unrelated selection pressure.
C. Phylogenetic analysis using cladistics can help reveal the sequence leading to the evolution of a complex character.
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The virus genome and viral proteins are assembled into virions (virus particles) during _____
A) the lytic cycle and the lysogenic cycle in all known host organisms B) the lysogenic cycle only C) the lytic cycle only D) the lytic cycle in all host organisms but the lysogenic cycle only in bacteria
Imagine that DNA is composed of equal proportions of six different types of nucleotide, instead of the normal four. The six nucleotides are A, C, G, T, X, and Y. In this new type of DNA molecule, A pairs with T, C pairs with G, and X pairs with Y. What would be the average size of the DNA fragments produced when this new DNA is cut by a restriction endonuclease with a four-base recognition sequence?
A) 125 bp B) 256 bp C) 425 bp D) 1056 bp E) 1296 bp
Which factor has so far kept gene therapy from becoming an effective treatment for genetic disorders?
A.) the difficulty of getting new genes to become part of a cell's DNA B.) the complexity of sequencing the entire human genome c.) the lack of success in finding genes that are responsible for genetic disorders D.) the ethical questions about making transgenic humans
In 1940, two researchers named Weiner and Landsteiner discovered that about 85 percent of the human population sampled possessed a blood cell protein that had been previously detected in Rhesus monkeys. This blood type was labeled Rh positive, and Rh+ was found to be dominant over the absence of the blood factor (Rh-). Under normal Mendelian inheritance, which of the following statements is FALSE?
A. An Rh- child would require that both parents be carriers of at least one Rh- gene. B. Two Rh- parents could have an Rh+ child. C. It is possible with just one pair of parents to have children where some siblings are Rh- and some are Rh+. D. Two Rh+ parents could have an Rh- child. E. All of the choices are false.