7 Science Cells Quiz

A microscope's total magnification is calculated by multiplying the magnification of the eyepiece by the magnification of the objective lens. In this case, the eyepiece has a magnification of 10x and the objective lens has a magnification of 4x. Therefore, the total magnification of the microscope would be 10x multiplied by 4x, which equals 40x.

The statement is stating a fact that some types of bacteria are beneficial to our health, while others can cause illness. This implies that there are different types of bacteria with different effects on our well-being. Therefore, the statement is true.

The explanation for the given correct answer is that the nucleus is indeed the cell's control centre and it contains the DNA. The nucleus is a membrane-bound organelle found in eukaryotic cells and it houses the genetic material of the cell, which is the DNA. The DNA contains the instructions for the cell's growth, development, and functioning. The nucleus also regulates the activities of the cell by controlling gene expression and protein synthesis. Therefore, it can be concluded that the statement is true.

The given statement is true because vacuoles, mitochondria, cell membrane, cytoplasm, and nucleus are all examples of organelles. Organelles are specialized structures within a cell that perform specific functions, such as storing materials, producing energy, controlling what enters and exits the cell, and containing the genetic information. These organelles work together to carry out the various processes necessary for the cell's survival and function. Therefore, the statement is correct.

The statement is true because the cell membrane acts as a selectively permeable barrier, allowing certain substances to enter or leave the cell while restricting others. It is composed of a phospholipid bilayer with embedded proteins that regulate the movement of molecules and ions. This control over the flow of materials is essential for maintaining the cell's internal environment and carrying out various cellular processes.

Unicellular organisms are indeed living creatures made up of only one cell. The prefix "uni" means one, so when we say "unicellular," we are referring to organisms that consist of a single cell. This is in contrast to multicellular organisms, which are made up of multiple cells. Therefore, the statement is true.

Cytoplasm is a fluid inside the cell. The cytoplasm is a gel-like substance that fills the cell and surrounds the organelles. It is composed of water, salts, and various organic molecules. The cytoplasm plays a crucial role in supporting and protecting the organelles within the cell, as well as facilitating various cellular processes such as metabolism and protein synthesis.

Mitochondria are organelles that produce energy for the cell to function. They are often referred to as the "powerhouses" of the cell because they generate adenosine triphosphate (ATP), which is the main source of energy for cellular activities. This energy production occurs through a process called cellular respiration, where nutrients such as glucose are broken down to release ATP. Without mitochondria, cells would not have the necessary energy to carry out essential functions and survival would be compromised.

Specialized cells are unique in that they have a specific function in the body. Unlike other cells, which may have a variety of functions, specialized cells are designed to perform a specific task or carry out a specific function. These cells have distinct structures and characteristics that enable them to perform their specialized functions efficiently.

An egg is an example of a large, common, single cell because it is a reproductive structure that contains all the necessary components to develop into a new organism. It is a single cell that is large enough to be visible to the naked eye and is commonly found in many animal species. The egg cell contains all the genetic information and nutrients needed for the development of the embryo, making it a prime example of a large, common, single cell.

The correct answer is "Plant cells contain chlorophyll, animal cells don't" and "Plant cells have a double layer wall (a cell membrane and cell wall)". These two statements highlight key differences between plant and animal cells. Chlorophyll is a pigment found in plant cells that allows them to perform photosynthesis, while animal cells do not have this pigment. The presence of a double layer wall in plant cells, consisting of both a cell membrane and a cell wall, provides additional structural support that is not present in animal cells.

The answer "The parts of a cell" is correct because organelles are specialized structures within a cell that perform specific functions. They are like tiny organs within the cell, each with its own specific role in maintaining the cell's overall function and survival. Organelles include structures such as the nucleus, mitochondria, endoplasmic reticulum, Golgi apparatus, and many others.

The correct answer includes all the body systems mentioned in the options. The circulatory system is responsible for transporting blood throughout the body. The respiratory system is involved in breathing and oxygen exchange. The nervous system consists of the brain, nerves, and is responsible for touch sensations. The reproductive system is involved in the production of babies, birth, and includes the sex organs. The excretory system is responsible for removing waste from the body.

Cell Theory is a fundamental concept in biology that states three main rules. The first rule is that all living things are made of cells. This means that cells are the basic building blocks of life. The second rule is that all cells are similar but not identical. This means that while cells may have similarities in structure and function, they can also have variations. The third rule is that cells reproduce by dividing in two. This means that cells have the ability to replicate and create new cells through the process of cell division.

The correct answer is the bottom lens closest to the specimen. The objective lens is the lens that is closest to the specimen being observed on a microscope. It is responsible for gathering light from the specimen and forming an enlarged image that can be viewed through the eyepiece. The objective lens is typically a series of lenses with different magnification powers, allowing for different levels of magnification when observing the specimen.