What are the units of hereditary information, are short segments of deoxyribonucleic acid (DNA) and also help cells to reproduce themselves and to assemble proteins?单项选择题
A
c. RNA
B
b. Chromosomes
C
d. Ribosomes
D
a. Genes

Question

What are the units of hereditary information, are short segments of deoxyribonucleic acid (DNA) and also help cells to reproduce themselves and to assemble proteins?

BlackTom AI · Accepted Answer

Let’s examine each option in turn to understand what best answers the question about units of hereditary information and features as short DNA segments that help cells reproduce and assemble proteins.
Option c: RNA. While RNA plays many roles in gene expression and protein synthesis, it is not the unit that carries hereditary information in most organisms. Hereditary information is stored in DNA, and RNA serves as a messenger or functional molecule in the process, not the basic hereditary unit itself. Therefore this choice misidentifies the fundamental unit.
Option b: Chromosomes. Chromosomes are large structures composed of DNA and proteins that organize genetic material during cell division. They contain many genes, but they are not the smallest units of heredity; the question asks for the basic unit, which is smaller than a chromosome. So this option is too broad and not the correct unit.
Option d: Ribosomes. Ribosomes are molecular machines that synthesize proteins by translating mRNA. They are essential for protein assembly, but they do not carry hereditary information and are not units of heredity. Hence this choice is incorrect as well.
Option a: Genes. Genes are the discrete units of hereditary information. They are segments of DNA that encode instructions for building proteins or functioning molecules, and their expression guides cellular reproduction and protein assembly processes. This aligns precisely with the concept described in the question: the fundamental hereditary units, comprising short DNA segments that influence reproduction and protein synthesis.
In summary, the other options either describe RNA, larger DNA-containing structures, or the machinery of protein synthesis, none of which serve as the basic hereditary unit. Genes uniquely fulfill the stated role as the foundational units of heredity and the genetic instructions for cellular function.

What are the units of hereditary information, are short segments of deoxyribonucleic acid (DNA) and also help cells to reproduce themselves and to assemble proteins?单项选择题

类似问题

Which of the following best defines a gene?

A portion of DNA that encodes a specific protein is

A segment of DNA that codes for a protein product is called:

A _________________ is a segment of DNA coding for a specific polypeptide (or protein)?

A _________ blank contains the necessary information for the production of a molecule of RNA. genome gene nucleotide genetic code codon

A _________ is a segment of DNA on a chromosome.

Question at position 1 A firm competing in a single-product market in a single geographic location does not need a corporate-level strategy regarding product diversity or an international strategy to deal with geographic diversity.TrueFalse

If marginal cost equals average cost, then what must be TRUE?

更多留学生实用工具

智能学习助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单