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.
Question: At the equator during metaphase of mitosis, there are:
Choices:
single chromosomes
duplicated chromosomes
G1-stage chromosomes
always 23 chromosomes
Question: When cancer occurs,
Choices:
control of the cell cycle is impaired
apoptosis has occurred
the cells can no longer enter the cell cycle
a lll of these are correct
Question: As a result of mitosis, each of the two new cells produced from the original cell during cytokinesis
Choices:
receives a few chromosomes from the original cell.
receives an exact copy of all the chromosomes present in the original cell. (correct answer, your response)
donates a chromosome to the original cell.
receives exactly half the chromosomes from the original cell.
Question: Which of the following is a correct statement about the events of the cell cycle?
Choices:
Telophase is part of the M phase, or mitosis
Nothing happens during the G1 and G2 phases
DNA replicates during cytokinesis (your response)
DNA replicates during cytokinesis (your response)
Question: Collectively, the time spent in G1 + S + G2 is called . ______
Choices:
Prophase
Interphase
Mitosis
Cell Cycle
Question: During normal mitotic cell division, a parent cell that has 4 chromosomes will produce 2 daughter cells, each containing
Choices:
4 Chromosomes
2 Chromosomes
8 Chromosomes
16 Chromosomes
Question: The chromosome of a bacterium
Choices:
is wrapped around carbohydrates.
has a circular shape.
occurs in multiple pairs within the cell.
is found within the nucleus.
Question: Which event occurs during interphase?
Choices:
Which event occurs during interphase?
The cytoplasm divides
Spindle fibers begin to form
Centromeres divide
Question: Which of the following happens when a cell divides?
Choices:
Each daughter cell receives its own copy of the parent cell's DNA (correct answer, your response)
The cell's volume increases
It becomes more difficult for the cell to get rid of wastes
It becomes more difficult for the cell to get enough oxygen and nutrients
Question: Chromatin condenses into chromosomes during which phase of mitosis?
Choices:
Interphase
Mitosis
Prophase
Question: Microtubules that extend from the poles of a cell to the centromeres during cell division are called ._______
Choices:
Spindle Fibers
Anaphase
Centromeres
Cytoplasm