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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 10: Cell Reproduction MCQ Multiple Choices Questions Quiz Test Bank
10.1 Cell Division
10.2 The Cell Cycle
10.3 Control of the Cell Cycle
10.4 Cancer and the Cell Cycle
10.5 Prokaryotic Cell Division
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Question: An organism's traits are determined by the specific combination of inherited _____.
Choices:
cells.
genes.
proteins.
chromatids.
Question: Attachment of the mitotic spindle fibers to the kinetochores is a characteristic of which stage of mitosis?
Choices:
prophase
prometaphase
metaphase
anaphase
Question: Identical copies of chromatin held together by cohesin at the centromere are called _____.
Choices:
histones.
nucleosomes.
chromatin.
sister chromatids.
Question: The chromosomes become visible under a light microscope during which stage of mitosis?
Choices:
prophase
prometaphase
metaphase
anaphase
Question: Which of the following events does not occur during some stages of interphase?
Choices:
DNA duplication
organelle duplication
increase in cell size
separation of sister chromatids
Question: Unpacking of chromosomes and the formation of a new nuclear envelope is a characteristic of which stage of mitosis?
Choices:
prometaphase
metaphase
anaphase
telophase
Question: The mitotic spindles arise from which cell structure?
Choices:
centromere
centrosome
kinetochore
cleavage furrow
Question: Separation of the sister chromatids is a characteristic of which stage of mitosis?
Choices:
prometaphase
metaphase
anaphase
telophase
Question: The first level of DNA organization in a eukaryotic cell is maintained by which molecule?
Choices:
cohesin
condensin
chromatin
histone
Question: Chromosomes are duplicated during what stage of the cell cycle?
Choices:
G1 phase
S phase
prophase
prometaphase
Question: A diploid cell has_______ the number of chromosomes as a haploid cell.
Choices:
one-fourth
half
twice
four times
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