If a gene in Drosophila is expressed only when an imaginal disc (
A) begins to differentiate, it is referred to as a homeotic gene. Recessive mutations in such genes often result in loss of function
so that the structure does not develop. If the gene is expressed, but in a different imaginal disc (B), what is the result?
A) loss of function of disc B's primary gene
B) gain of function of several inappropriate genes in disc A
C) gain of function in disc B at the "wrong" location
D) deregulation of gene expression throughout disc A
E) deregulation of gene expression throughout disc B
C
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Which of the following general transcription factors is bound to RNA polymerase II before it is recruited to the promoter?
A. TFIIB B. TFIIE C. TFIIF D. TFIIH E. None of the choices given is correct.
Pertussis has been making a big comeback in the last few years, after being on the decline for quite a long time. Why is this?
A. The pertussis vaccine does not seem to protect for a lifetime, so those who received the vaccine as kids may become susceptible in adulthood. B. The strain of Bordetella pertussis that is now the major cause of pertussis is much more virulent than earlier strains. C. People eat so much refined sugars and starches that our immune systems are much weaker, thereby not being able to adequately protect against pertussis bacteria. D. Few people have ever received pertussis vaccines because there have been links to autism.
Red algae can survive in deeper water because
of
a. phycobilins. b. holdfasts. c. chlorophyll a. d. a stonelike cell wall. e. their preference for freshwater habitat.
The water-hating hydrophobic tails of the phospholipid bilayer face the outside of the cell membrane
Indicate whether the statement is true or false.