Density-dependent inhibition is explained by which of the following?
A) As cells become more numerous, they begin to squeeze against each other, restricting their size and ability to produce control factors.
B) As cells become more numerous, the cell surface proteins of one cell contact the adjoining cells and they stop dividing.
C) As cells become more numerous, the protein kinases they produce begin to compete with each other, such that the proteins produced by one cell essentially cancel those produced by its neighbor.
D) As cells become more numerous, the level of waste products increases, eventually slowing down metabolism.
B
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A friend of yours is wondering about the differences between the words orientation and navigation when these two terms are used in descriptions of bird migrations. Since you have studied and know something about animal behavior, what do you tell your friend?
A. Orientation is adjusting a bearing, while navigation is actually following a bearing. B. Orientation and navigation are used interchangeably when referring to avian migrations. C. Orientation is following a bearing, while navigation is setting or adjusting a bearing. D. Orientation is following the sun in the day as starling do, while navigation is following a bearing with a small amount of magnetite, which is found in the heads of some migratory birds. E. Orientation is the ability to find true east, navigation is the ability to find a bearing while crossing water.
In pines, the female gametophyte contains _____, each of which contains a(n) _____.
a) archegonia ... egg b) antheridia ... egg c) antheridia ... sperm cell d) archegonia ... sperm cell e) microsporangia ... egg cell
What is the second of the two names in an organism's scientific name?
A) Species B) Genus C) Kingdom D) Order E) Family
Two of the Domains in the 3 Domain system of classification are considered one Kingdom in the 5 Kingdom system, that is the Kingdom ___________.
Fill in the blank(s) with the appropriate word(s).