Current thinking about the cause of Hutchinson-Gilford syndrome, which is a severe rapid aging condition, is that
A) the body is unable to secrete insulin.
B) the part of the brain that controls aging is damaged.
C) abnormal lamin A protein stresses the nuclear membrane, disturbing DNA repair such that mutations accumulate that cause the diseases of aging.
D) a protein called progerin forms clumps in the brain in a way that removes DNA from the tips of telomeres, shortening chromosomes and lifespan.
C) abnormal lamin A protein stresses the nuclear membrane, disturbing DNA repair such that mutations accumulate that cause the diseases of aging.
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Compared to plants from other environments, the cells of many desert plants contain high concentrations of solutes
This helps them survive in their arid surroundings because the high solute concentrations create relatively _____, which help reduce water loss. A) low solute potentials B) high pressure potentials C) low pressure potentials D) high solute potentials
DNA technology has revolutionized forensic science. Several unsolved cases have been solved with this type of evidence, and some convicted persons have been exonerated with DNA evidence. What is the type of technology shown in the image?
a) Gel Eletrophoresis b) Centrifugation c) DNA splicing d) Polymerase Chain Reaction
Pollen tubes
A. package sperm into pollen granules. B. facilitate the growth of pollen. C. allow sperm to fertilize the egg. D. transport pollen to the stigma. E. are present during spermatogenesis.
The three-dimensional coordinates of atoms within a folded protein are determined experimentally. After researchers obtain a protein's structural details, they can use different techniques to highlight particular aspects of the structure
What visual model best displays a protein's secondary structures (? helices and ? sheets)? (a) ribbon (b) space-filling (c) backbone (d) wire