A ________ is the first cell that results when an egg is fertilized by a sperm.
A. zygote
B. spermatogonium
C. gastrula
D. blastula
Answer: A
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The upstream activator sequences (UASs) of yeast are analogous to ______________ in higher eukaryotes
A. promoters B. TATA boxes C. operators D. enhancers
In the Hershey and Chase experiment, phage-infected bacteria and viral progeny were radioactive following bacterial
infection with 32P-labeled viruses. Why?
a. Bacteria had incorporated radioactive proteins into their DNA. b. Bacteria and viral progeny had incorporated 32P into their DNA. c. Viral progeny had used the 32P to build new viral proteins. d. Bacteria had incorporated radioactive proteins into their cell membranes. e. 32P was left outside the cell during viral infection.
A mutation expressed only under certain conditions is
A) germinal. B) de novo. C) conditional. D) deleterious
Enhancer trapping might occur if you create a library of insertions bearing enhancer-less GAL4 genes. Their expression will be controlled by __________
A) also inserting a viral enhancer B) also inserting a GAL4 reporter C) including a bacterial origin sequence D) enhancers mapping near the insertion site E) including an enhancer activator