A. Has a nucleus B. Has membrane-bound organelles C. Small and simple structure D. Complex genetic material 相关知识点: 试题来源: 解析 C。原核细胞的特点是结构小且简单。原核细胞没有细胞核(A 选项),也没有膜包被的细胞器(B 选项),遗传物质相对简单(D 选项)。反馈...
Cell Organelles: A cell is a structure that is found in both plants and animals. A cell can be defined as the most basic functioning unit of an organism. Different types of cells form a tissue. In a cell, there are various organelles. T...
A prokaryotic cell is one of two major cell types, and the other cell type is eukaryotic. These two cell types differ in their general structure and function. Answer and Explanation: The structure that would not be found in a p...
A solvent is a liquid that is used to dissolve the reactants of a chemical reaction. It serve...
Heterogeneity is a hallmark of the adaptive immune system. This is most evident in the enormous diversity of B and T cell antigen receptors. There is also ... SM Kaech,EJ Wherry - 《Immunity》 被引量: 195发表: 2007年 Antibody-Mediated Immunity against Intracellular Pathogens: Two-Dimensional...
Multicellular plants and animals, as well as many unicellular organisms, are eukary-otic—their large, complex cells have a well-formed nucleus and many organelles. On the other hand, the true bacteria are prokaryotic cell, which are simple and lack a nucleus. The distinction between eukaryotes...
A prokaryotic cell expressing a gene of interest and comprising at least two copies of said gene on the chromosome. The copies are transcribed in different directions thereby avoiding homologous cross out. The DNA-segment between the two copies does not comprise any information essential for cell ...
留园、沧浪亭、瞻园等江南名园的经典景观和造园技法；和广东、福建并列为三大以省为单位建设的大展园，由苏州市和南京市联手共建。 ②从5号门区进入园博园，对面小山坡上一大片樱花树，4月底5月初，一树树粉色的樱花中夹杂着几棵白色樱花，微风一吹，落英缤纷。就在这花树婆娑中，若隐若现着白墙灰...
C) Most enzymes are proteins: Proteins make up the majority of enzymes. Non-protein components or metallic elements can be bound to certain enzymes in order for them to act. Ribozyme is a kind of enzyme, not a protein.D) None of the above: By considering the first...
As you can imagine, the cell cycle is a tightly regulated process. There are checkpoints throughout the cell cycle to ensure that everything is in order at the end of each stage before the cell proceeds to the next stage. As you might imagine, a failure to properly complete one stage ...