A person who has just experienced a painful sunburn has a large number of cells undergoing mitosis for the purpose of
A. developing new stem cells that will give rise to new skin cells.
B. repairing and replacing the damaged cells, in the healing process of the skin.
C. replication of new DNA copies, so that meiosis will further grow new skin cells.
D. modifying new cells that will have different specialties than the original damaged cells.
E. asexual reproduction, to produce new skin buds that will fold over and cover the burn.
B. repairing and replacing the damaged cells, in the healing process of the skin.
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Which of the following manipulations would reduce the release of neurotransmitter from a presynaptic neuron terminal?
I) reduction in extracellular calcium ion concentration at the axon terminal II) increase in extracellular sodium and potassium ion concentrations at the axon terminal III) addition of tetrodotoxin to the extracellular fluid at the axon terminal A) only I B) only II C) only III D) only II and III E) only I and II
In DNA, cytosine always pairs with ________________
a. thymine b. guanine c. cytosine
The male gametophytes of flowering plants are also referred to as _____.
Fill in the blank(s) with the appropriate word(s).
Which of the following groups is crucial to the structure and function of the sex hormones estrogen and testosterone?
A) Nucleic acids B) Lipids C) Carbohydrates D) Proteins