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
ANSWER: a
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Imagine that you have sequenced the genome of a human pathogenic bacterium. In the early stages of analysis, you discover a stretch of DNA that has a significantly different GC content (the proportion of bases that are G and C)
Further examination of this region shows there are roughly one dozen protein-coding regions. These are not found in the genome of a previously sequenced and related nonpathogenic bacterium. These sequences do, however, predict protein products strikingly similar to those of another bacterial pathogen that is not closely related to the organism you are studying. You immediately suspect _____. A) neutral evolution B) that both sequences are introns C) a high rate of mutation D) a low rate of mutation E) lateral gene transfer
Huntington’s disease is a dominant autosomal
genetic disorder. Albert has Huntington’s disease as did his mother. His father was normal. Albert is married to Lydia who does not have Huntington’s disease. If Albert and Lydia have a child, what is the probability that their child will have Huntington’s disease?
a. 0% b. 25% c. 50% d. 75% e. 100%
Reznick and Endler's research with guppies suggested four of the following. Which one is the exception?
A. Life history traits can be inherited. B. Life history traits evolve. C. Life history traits can be altered over a short period of time. D. Life history traits are not influenced by predation patterns. E. Life history traits are coded for in DNA.
Which of the following virus structures contain the receptor sites that allow it to attach to specific sites on a cell?
a) capsule b) cell wall c) plasma membrane d) envelope e) nucleic acid core