Phosphorus has an atomic number of 15, so what is the distribution of its electrons?
A) The first energy level has 2, the second has 8, and the third has 5.
B) The first energy level has 2 and the second has 13.
C) The first energy level has 8 and the second has 7.
D) The first, second, and third energy levels have 5 electrons each.
E) The electron arrangement cannot be determined from the atomic number alone.
A
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Severe physical impacts on a habitat are called ____
Fill in the blank with the appropriate word.
Which of the following is an example of alternation of generations?
A) A grandparent and grandchild each have dark hair, but the parent has blond hair. B) A diploid plant (sporophyte) produces, by meiosis, a spore that gives rise to a multicellular, haploid pollen grain (gametophyte). C) A diploid animal produces gametes by meiosis, and the gametes undergo fertilization to produce a diploid zygote. D) A haploid mushroom produces gametes by mitosis, and the gametes undergo fertilization, which is immediately followed by meiosis.
When a cytoplasmic vesicle fuses with the plasma membrane, expelling its contents outside the cell, the process is known as:
A. exocytosis B. endocytosis C. phagocytosis D. active transport
Nerve cells have long thin extensions of their cell membrane called axons. The cell has to get mitochondria from the body of the cell all the way down to the end of the axon to provide energy for nerve signal transmission. What structure in a nerve cell
would be involved in moving the mitochondria, and how would it work? What will be an ideal response?