A reddish chemical, lipofuscin, is found in greater quantities in cells of older people than in those from younger people. This chemical should be broken down in the cells. Which specific type of organelle is not working as well in the seniors?
A) lysosome
B) mitochondrion
C) nucleus
D) rough endoplasmic reticulum
A
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A small, heat-stable DNA-binding protein present in the cells of some Archaea, called Sac7d, binds to the minor groove of DNA in a very specific manner and increases its melting temperature by 40 °C
Indicate whether the statement is true or false.
________ causes 15 - 20% of all human deaths in developed countries
a. Heart disease b. Strokes c. Cancer d. Car accidents e. Diabetes
The observation that all races of humans have the same FOXP2 allele is evidence that favored this allele.
A. independent assortment B. natural selection C. random chance D. recombination E. artificial selection
The net direction that an ion or molecule moves is
a. dependent upon the size of the molecule. b. unpredictable because movement is random. c. determined by the temperature of the medium. d. determined by the membranes in the vicinity. e. the result of concentration differences.