The observation that although fresh water habitats account for only 1% of the Earth's water, they are home to 36% of the known species of fish is due to _______ speciation.
A. prezygotic
B. postzygotic
C. allopatric
D. sympatric
E. outgroup
C. allopatric
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The first cell of a new individual is the
a. blastula. b. gastrula. c. embryo. d. zygote. e. gamete
Proteins that are produced in a disease tissue and can act as a means of tracking a disease's progression (such as PSA in prostate cancer) is known as ________
A) an embryonic marker B) an STR C) a microarray D) a biomarker E) a tag
You are studying the function of a recently identified gene in C. elegans. You perform genetic screens for several months in an attempt to isolate loss-of-function gene mutations, but your efforts are unsuccessful. Your advisor suggests you try another approach to eliminate gene function. The best technique to accomplish this goal would be
A. use RNA interference to prevent mRNA translation. B. use a histone deacetylase to induce a transcriptionally inactive state. C. to design a repressor to bind to the operon of this gene. D. use a C. elegans strain with a homozygous TFIID mutation to prevent the translation initiation complex from forming.
Which of the following proteins-functions is mismatched?
A. DNA primase-production of RNA primer B. single-stranded binding proteins-prevents single DNA strands from reforming into a double helix C. DNA polymerase-primer removal and replacement with DNA D. DNA polymerase-DNA synthesis E. topoisomerase-separates double-stranded DNA into single strands