This is a type of white blood cell that can kill many different types of microbes and some tumor cells by producing perforins that perforate the cell membrane of the foreign cell, causing the death of the cell
a. phagocyte
b. complement
c. rhinovirus
d. natural killer cell
e. macrophage
D
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Once uterine contractions have begun, the female body releases several hormones that act in a positive feedback loop. The purpose of this feedback loop is ________.
A. to promote the development of a new follicle B. to ensure continued contractions until labor is complete C. inhibit the release of prostaglandins D. decrease the number of oxytocin receptors in the uterus
The problem below relates to the synthesis of several intermediates in the citric acid cycle, which is essential in the production of ATP through aerobic respiration
A set of experimental results relating the growth (+) of Neurospora on several media is given in the table. Based on the information provided, present the biochemical pathway for the substances oxaloacetate, fumarate, malate, and succinate and the locations of the metabolic blocks produced by the various strains. Strain Medium MM MM MM MM MM + oxaloacetate + fumarate + malate + succinate l62 - + - + - l36 - + - - - l41 - + + + - MM = minimal medium
The process by which an oocyte bursts from an ovary and usually enters an oviduct (Fallopian tube) is called ____________.
Fill in the blank(s) with the appropriate word(s)
Animal cells have "counters" that keep track of how many times a cell has divided. These counters are called:
A) centromeres. B) odometers. C) telomeres. D) nuclei. E)chromosomes.