When the chromosomes have moved around so that they all lie on a plane in the middle of the cell, the stage is called
A. anaphase.
B. metaphase.
C. prophase.
D. telophase.
B. metaphase.
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Match each description below with the type of cell junction it characterizes:
a. adherens junction b. desmosome c. hemidesmosome d. tight junction e. gap junction ____________ Transmembrane proteins on the plasma membrane arranged in a ring that bind to a similar protein ring on an adjacent cell to allow transfer of materials between the cells. ____________ A mesh-like attachment between cells formed by binding of transmembrane proteins of one cell to the same protein type on the adjacent cell, preventing substances from passing between cells. ____________ A band-like attachment where cadherins attach to microfilaments inside the cell and to the extracellular domain of an adjacent cell's cadherin proteins on the outside of the cells. ____________ A button-like point of attachment where integrins attach to intermediate filaments inside the cell and to a protein of the extracellular matrix on the outside of the cells. ____________ A button-like point of attachment where cadherins attach to intermediate filaments inside the cell and to the extracellular domain of an adjacent cell's cadherin proteins on the outside of the cells. What will be an ideal response?
In DNA, the purines are ____
a. thymine and cytosine b. adenine and cytosine c. adenine and guanine d. thymine and adenine e. guanine and thymine
A behavior that can increase reproductive success of an individual male in a species is
A. All of the answer choices are correct. B. direct physical competition for the "right" to mate with a particular female. C. post-mating physical competition to block other males from subsequently mating with the female. D. the removal of the sperm from other males, so that there will be no successful fertilization. E. the ability to produce more sperm can be produced or released.
Plants called legumes have chambers in their roots that house nitrogen-fixing bacteria. Nitrogen-fixing bacteria get both a place to live and energy while supplying nitrogen to a plant. What is this ecological relationship called?
A) Competition B) Parasitism C) Succession D) Predation E) Mutualism