个人为实现发展目标而采取行为的内在动力称为: A.职业发展 A. 职业素质 C.职业期望 B. 职业成功 E.职业目标 C. :C D. 程度:中 E. 解析: F. :单选题 G. r> 8、护理人员工作绩效评价的信度是指: A.评价结果的客观性 H. 评价结果的可靠性 C.评价结果的真实性 I. 评价结果的准确性 J. 评价结果的科学性
【多选题】Noncoding RNAs (ncRNAs) with different lengths have various roles, serving as regulatory, structural, and catalytic components of cells. Abundant and functionally important types of ncRNAs include tra...
A.
rRNAs form the structural and catalytic core of the ribosomes, which translate mRNAs into protein. tRNAs act as adaptors that select specific amino acids and hold them in place on a ribosome for their incorporation into protein.
B.
In higher eukaryotes, miRNAs regulate gene expression. A single miRNA can reduce the expression levels of hundreds of genes. The mechanism by which mature miRNA molecules act is through partial complementary to one or more mRNA molecules, generally in 3'-UTR. The main function of miRNAs is to down-regulate gene expression. Many other ncRNAs are involved in RNA splicing, gene regulation, telomere maintenance, and many other cellular processes.
C.
Piwi-interacting RNAs (piRNAs) expressed in mammalian testes and somatic cells form RNA-protein complexes with Piwi proteins. These piRNA complexes (piRCs) have been linked to transcriptional gene silencing of retrotransposons and other genetic elements in germ line cells, particularly those in spermatogenesis.
D.
The more conserved ncRNAs are thought to be molecular fossils or relics from the last universal common ancestor and the RNA world, and their current roles remain mostly in regulation of information flow from DNA to protein .
【简答题】完形填空。 What is a clone? A clone is a copy-a genetic (基因的) copy. Genes (基因) are the in-structions for life. They 1 a cell what to do and how to do it. Genes make 2 plant or animal different and unique. ...