【多选题】关于我是谁的回答,下面各个层面描述正确的有:The list of answers to the question “Who Am I?” probably include examples of each of the following four types of responses:()
A.
Physical Description: I’m tall, have blue eyes...etc.
B.
Social Roles: We are all social beings whose behavior is shaped to some extent by the roles we play. Such roles as student, housewife, or member of the football team not only help others to recognize us but also help us to know what is expected of us in various situations.
C.
Traits: These are a third dimension of our self-descriptions. “I’m impulsive...I’m generous...I tend to worry a lot”...etc.
D.
Existential Statements (abstract ones): These can range from "I’m a child of the universe" to "I’m a human being" to "I’m a spiritual being"...etc.
【多选题】What are the composition, mechanical properties, and roles of i ntermediate filaments inside the cell?
A.
Intermediate filaments are ropelike fibers with a diameter of about 10 nm; they are made of fibrous intermediate filament proteins.
B.
One type of intermediate filament forms a meshwork called the nuclear lamina just beneath the inner nuclear membrane. Other types extend across the cytoplasm, giving cells mechanical strength and distributing the mechanical stresses in an epithelial tissue by spanning the cytoplasm from one cell–cell junction to another.
C.
Intermediate filaments are very flexible and have great tensile strength.
【多选题】How does the initiation of transcription in eukaryotes differ from the process in bacteria?
A.
While bacteria use a single type of RNA polymerase for transcription, eukaryotic cells employ three: RNA polymerase I, RNA polymerase II, and RNA polymerase III. These polymerases are responsible for transcribing different types of genes. RNA polymerases I and III transcribe the genes encoding transfer RNA, ribosomal RNA, and various other RNAs that play structural and catalytic roles in the cell. RNA polymerase II transcribes the rest, including all those that encode proteins—which constitutes the majority of genes. in eukaryotes
B.
Whereas the bacterial RNA polymerase (along with its sigma subunit) is able to initiate transcription on its own, eukaryotic RNA polymerases require the assistance of a large set of accessory proteins. Principal among these are the general transcription factors, which must assemble at each promoter, along with the polymerase, before transcription can begin.
C.
The mechanisms that control the initiation of transcription in eukaryotes are much more elaborate than those that operate in prokaryotes. In bacteria, genes tend to lie very close to one another, with only very short lengths of nontranscribed DNA between them. But in plants and animals, including humans, individual genes are spread out along the DNA, with stretches of up to 100,000 nucleotide pairs between one gene and the next. This architecture allows a single gene to be controlled by a large variety of regulatory DNA sequences scattered along the DNA, and it enables eukaryotes to engage in more complex forms of transcriptional regulation than do bacteria.
D.
Eukaryotic transcription initiation must deal with the packing of DNA into nucleosomes and higher-order forms of chromatin structure.
【多选题】关于我是谁的回答,下面各个层面描述正确的有:The list of answers to the question “Who Am I?” probably include examples of each of the following four types of responses:()
A.
Physical Description: I’m tall, have blue eyes...etc.
B.
Social Roles: We are all social beings whose behavior is shaped to some extent by the roles we play. Such roles as student, housewife, or member of the football team not only help others to recognize us but also help us to know what is expected of us in various situations.
C.
Personal Traits: These are a third dimension of our self-descriptions. “I’m impulsive...I’m generous...I tend to worry a lot”...etc.
D.
Existential Statements (abstract ones): These can range from "I’m a child of the universe" to "I’m a human being" to "I’m a spiritual being"...etc.