Which statement is correct about the cells produced by mitosis?
Two daughter cells are produced. Each has the same number of chromosomes as the parent cells
Four daughter cells are produced. Each has the same number of chromosomes as the parent cells
Two daughter cells are produced. Each has half the number of chromosomes as the parent cells
What happens in the stage directly before mitosis in the cell cycle?
A period of DNA synthesis
The cytoplasm separates
A period of growth, during which time DNA is checked for errors
Which statement about stem cells is incorrect?
Embryonic stem cells can differentiate into different cell types
Adult stem cells are limited to a few locations in adults such as the bone marrow
Bone marrow transplants use embryonic stem cells
A scientist observes 100 cancer cells with a microscope. If 16 cells are undergoing mitosis, and the length of the cell cycle is 400 hours, what is the length of mitosis?
116 hours
64 hours
4 hours
Which of the following is an ethical consideration about the use of embryonic stem cells?
In some cases embryos are being produced just so that stem cells can be extracted for research on therapies.
Transplants of stem cells from donors might transfer viruses to patients.
There may be complications in medical procedures involving stem cells.
Which statement is correct of plant stem cells?
Plant stem cells are identical in structure to animal stem cells
Plant stem cells have chloroplasts
Plant stem cells occur in meristems
How is a muscle adapted to its function?
It contains protein filaments that slide over each other and cause contraction
Muscular tissue has many nuclei
Muscular tissue has few mitochondria
Which of the following is an adaptation to the transport of substances in the xylem?
Companion cells provide the energy required for xylem transport
The ends of xylem vessels are perforated, like a sieve, so that substances can be transported
There are no end walls, and the side walls are thickened
How is a root hair cell adapted to its function?
It has a very large surface area
It is full of chloroplasts for photosynthesis
It possesses a long axon
How is a nerve cell adapted to its function?
It produces hormones which are released into the blood
It can contract and relax