Like DNA microarrays, Northern blots analyze the levels of mRNA. However, Northern blots are almost always prepared with a probe tagged with one label, whereas DNA microarrays almost always use two groups of probes, each one tagged with a different fluore
scent label. What is the advantage of using two labels for the microarray probes? The two labels _____.
A) increase the sensitivity of the microarray
B) allow the analysis of the expression of more genes
C) allow simultaneous assay of levels of DNA and RNA
D) allow comparison of gene expression between two samples
Answer: D
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Efficiently translated mRNAs tend to be stable in the cytoplasm; those that are poorly translated tend tobe rapidly degraded. Which of the following is not a step in the pathway for mRNA degradation?
A. targeting of upstream ORFs for nuclease binding B. removal of the poly(A) tail C. removal of the 5' 7-meG cap D. binding of mRNA by 5'-3' and 3'-5' RNA exonucleases
In the profundal zone of a lake or pond, the rate of photosynthesis exceeds the rate of respiration
Indicate whether the statement is true or false
An embryo having a blastodisc exhibits holoblastic cleavage
____________________ Indicate whether the statement is true or false.
The human genome comprises:
a. an X and a Y chromosome. b. a homologous pair of chromosomes. c. 46 chromosomes. d. 46 pairs of chromosomes. e. 23 chromosomes.