1.
The cell is the most basic unit of life.
Correct Answer
A. True
Explanation
The statement "The cell is the most basic unit of life" is true because cells are the smallest structural and functional units of living organisms. They are responsible for carrying out essential biological processes and are capable of self-replication. Cells make up all living organisms, from simple single-celled organisms to complex multicellular organisms. They have specialized structures and organelles that perform specific functions necessary for life. Therefore, understanding the cell is crucial in understanding the fundamental processes and mechanisms of life.
2.
Cells are only in mammals.
Correct Answer
B. False
Explanation
This statement is false because cells are not only found in mammals. Cells are the basic building blocks of all living organisms, including plants, animals, fungi, and bacteria. Therefore, cells are not exclusive to mammals and can be found in various other organisms as well.
3.
Prokaryotic cells don't have a nucleus.
Correct Answer
A. True
Explanation
Prokaryotic cells are a type of cell that do not contain a nucleus. Instead, their genetic material is located in the cytoplasm. This is in contrast to eukaryotic cells, which do have a nucleus where their genetic material is housed. Therefore, the statement that prokaryotic cells don't have a nucleus is true.
4.
Who first discovered the cell?
Correct Answer
B. Robert Hooke
Explanation
Robert Hooke is credited with being the first person to discover cells. In 1665, he observed thin slices of cork under a microscope and noticed that they were made up of small, box-like structures which he called "cells" due to their resemblance to small rooms or cells in a monastery. This discovery laid the foundation for the field of cell biology and revolutionized our understanding of the structure and function of living organisms.
5.
________ is the cell substance between the cell membrane and the nucleus, containing the cytosol, organelles, cytoskeleton, and various particles.
Correct Answer
Cytoplasm
Explanation
The cell substance between the cell membrane and the nucleus, containing the cytosol, organelles, cytoskeleton, and various particles is called cytoplasm.
6.
Cells come from pre-existing cells.
Correct Answer
A. True
Explanation
This statement is known as the cell theory, which states that all living organisms are composed of cells and that cells arise only from pre-existing cells. This theory is supported by numerous scientific observations and experiments and is a fundamental principle in biology. It highlights the importance of cell division and reproduction in the growth and development of living organisms.
7.
The human body doesn't have many cells.
Correct Answer
B. False
8.
You need a microscope to see individual cells.
Correct Answer
A. True
Explanation
A microscope is required to see individual cells because cells are very small and cannot be seen with the naked eye. Microscopes use lenses to magnify the image of the cells, allowing us to observe them in detail. Without a microscope, cells would appear as tiny dots or would be completely invisible. Therefore, the statement "You need a microscope to see individual cells" is true.
9.
The activity of an organism depends on the total activity of independent cells.
Correct Answer
A. True
Explanation
The activity of an organism is determined by the combined activity of its individual cells. Each cell performs specific functions and contributes to the overall functioning of the organism. Therefore, the statement that the activity of an organism depends on the total activity of independent cells is true. The cells work together to carry out essential processes such as metabolism, growth, and reproduction, which ultimately determine the activity and functioning of the organism as a whole.
10.
No energy flow occurs within cells.
Correct Answer
B. False
Explanation
Energy flow does occur within cells. Cells require energy to carry out various functions such as metabolism, growth, and reproduction. This energy is obtained through processes like cellular respiration, where glucose is broken down to release energy in the form of ATP. Additionally, cells also utilize energy in the form of ATP to transport molecules across cell membranes, maintain ion gradients, and perform other essential cellular processes. Therefore, it is incorrect to say that no energy flow occurs within cells.