Two major types of protein secondary structures are referred to as:
a. amino and carboxyl.
b. ? helix and ? sheet.
c. elementary and primary.
d. residual and permanent.
e. ionic and covalent.
Ans: b. ? helix and ? sheet.
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Which of the following is not true about the sequencing of Neanderthal DNA?
A. Neanderthal mitochondrial DNA shows the same haplotypes as human DNA. B. Small amounts of Neanderthal DNA are cloned into a library, and the cloned sequences are sequenced at random. C. Sequences obtained from random clones are compared with existing human genome and chimpanzee genome data bases. D. Segments derived from Neanderthal DNA can be distinguished from segments derived from bacteria or insects by computerized analysis. E. The data provides evidence that modern humans and the Neanderthals shared a common ancestor about 700,000 years ago.
In bilateral animals, _____ is contained within a cavity, cushions the gut during body movements, and is a means by which materials are distributed throughout the body
a. a coelom b. mesoderm c. a mantle d. a water-vascular system e. coelomic fluid
Adenoviruses are a frequent cause of acute upper respiratory tract infections in humans. Adenoviruses are nonenveloped and their capsid contains a "fiber" protein that is analogous in function to the spike glycoproteins of HIV. Which of the following would be ACCURATE about an adenovirus that has a mutation in its fiber protein gene?
A. The virus would still cause upper respiratory tract infections in humans but at a slower rate. B. It would be able to infect humans normally, but would not be able to release new adenoviruses from the human cells. C. Because it has a defective fiber protein, it will now have a broader host range. D. It would not be able to cause disease in humans. E. It would be able to infect humans normally, but would not be able to replicate its genome.
A cell containing 98% water in its cytoplasm is placed in a 2% salt solution. It should
a. lose water b. gain water c. neither lose nor gain water d. gain salt because of the high rate of diffusion