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【单选题】
Motivation is best defined as a process that ______.A.
results in a level of effort
B.
intensifies an individual's efforts
C.
accounts for an individual's efforts toward attaining a goal
D.
meets an individual's need
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【简答题】There are lots of ways to raise awareness for a cause. Usually, the 1 the idea is, the more it gets noticed. And that’s precisely why one 2 Frenchman has caught our attention. Baptiste Dubanchet is bi...
【简答题】There are lots of ways to raise awareness for a cause. Usually, the __1__ the idea is, the more it gets noticed. And that's precisely why one __ 2 __Frenchman has caught our attention. Baptiste...
【单选题】Gordon Gekko has assembled a portfolio consisting of ten 90-day US Treasury bills, each having a face value of $1000 and a current price of $990.10, and 200 90-day European call options, each written ...
A.
$190.495
B.
$200.495
C.
$215.495
D.
$300.495
【多选题】There are several important differences between genomic DNA clones and cDNA clones. What are the differences?
A.
Genomic clones represent a random sample of all of the DNA sequences found in an organism’s genome and, with very rare exceptions, will contain the same sequences regardless of the cell type from which the DNA came.
B.
Also, genomic clones from eukaryotes contain large amounts of noncoding DNA, repetitive DNA sequences, introns, regulatory DNA, and spacer DNA; sequences that code for proteins will make up only a few percent of the library.
C.
By contrast, cDNA clones contain predominantly protein-coding sequences, and only those sequences that have been transcribed into mRNA in the cells from which the cDNA was made.
D.
As different types of cells produce distinct sets of mRNA molecules, each yields a different cDNA library. Furthermore, patterns of gene expression change during development, so cells at different stages in their development will also yield different cDNA libraries. Thus, cDNAs can be used to assess which genes are expressed in specific cells, at particular times in development, or under a particular set of conditions.
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