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1.1 The study of life Read Online
Viewed from space, Earth offers no clues about the diversity of life forms that reside there. The first forms of life on Earth are thought to have been microorganisms that existed for billions of years in the ocean before plants and animals appeared. The mammals, birds, and flowers so familiar to us are all relatively recent, originating 130 to 200 million years ago. Humans have inhabited this planet for only the last 2.5 million years, and only in the last 200,000 years have humans started looking like we do today.
Chapter 04: Cell Structure
4.1 Studying Cells
4.2 Prokaryotic Cells
4.3 Eukaryotic Cells
4.4 The Endomembrane System and Proteins
4.5 The Cytoskeleton
4.6 Connections between Cells and Cellular Activities
Download MCQ Quiz PDF eBook
Question: Which of the following is found both in eukaryotic and prokaryotic cells?
Choices:
nucleus
mitochondrion
vacuole
ribosomes
Question: The process by which a cell engulfs a foreign particle is known as:
Choices:
endosymbiosis
phagocytosis
hydrolysis
membrane synthesis
Question: Prokaryotes depend on ________ to obtain some materials and to get rid of wastes.
Choices:
ribosomes
flagella
cell division
diffusion
Question: Which of the following is most likely to have the greatest concentration of smooth endoplasmic reticulum?
Choices:
a cell that secretes enzymes
a cell that destroys pathogens
a cell that makes steroid hormones
a cell that engages in photosynthesis
Question: Bacteria that lack fimbrae are less likely to ________.
Choices:
adhere to cell surfaces
swim through bodily fluids
synthesize proteins
retain the ability to divide
Question: Which of the following is not a component of the endomembrane system?
Choices:
mitochondrion
Golgi apparatus
endoplasmic reticulum
lysosome
Question: In plant cells, the function of the lysosomes is carried out by __________.
Choices:
vacuoles
peroxisomes
ribosomes
nuclei
Question: When viewing a specimen through a light microscope, scientists use ________ to distinguish the individual components of cells.
Choices:
a beam of electrons
radioactive isotopes
special stains
high temperatures
Question: Which of the following is surrounded by two phospholipid bilayers?
Choices:
the ribosomes
the vesicles
the cytoplasm
the nucleoplasm
Question: The ________ is the basic unit of life.
Choices:
organism
cell
tissue
organ
Question: Peroxisomes got their name because hydrogen peroxide is:
Choices:
used in their detoxification reactions
produced during their oxidation reactions
incorporated into their membranes
a cofactor for the organelles' enzymes
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