Cells and tissues：练习题

Which statement correctly describes the basic structure of a DNA molecule?

Human sperm cells are highly specialized for reproduction. Which structural feature allows them to move towards the egg (ovum) for fertilization?

In the context of genetic engineering, what is the primary biological objective of producing Golden Rice?

Which of the following cellular structures contains chromosomes and acts as the control center of a human cell by directing protein synthesis?

A Transmission Electron Micrograph (TEM) of a cell shows a high density of rough endoplasmic reticulum and a large Golgi apparatus. Based on this ultrastructure, which of the following is the most likely function of this cell?

Describe how the nucleotide sequence of a gene is converted into a functional protein through the stages of transcription and translation.

Describe the sequence of events that occurs during the translation of mRNA, specifically explaining how anticodons and amino acids are involved in forming a polypeptide chain.

Describe the specific role of DNA polymerase in the process of DNA replication and explain why it is essential that this process occurs before a cell enters mitosis.

Mitosis is essential for the survival and growth of multicellular organisms.
a) Identify the four main stages of mitosis.
b) Describe the biological significance of mitosis in terms of the genetic makeup and number of the resulting daughter cells.
c) Give two examples of when mitosis occurs in the human body.

DNA replication is essential for cell division.
a) Outline the steps of DNA replication, clearly identifying the role of DNA polymerase.
b) Explain why it is biologically necessary for DNA to replicate before a cell enters mitosis.
c) Predict the potential consequence for the daughter cells if a mutation occurs during the replication process and is not corrected.