As a protein is being synthesized, the correct folding of the protein is aided by the movement of nonpolar amino acids toward the inner areas of the protein. How can this phenomenon be explained?
What will be an ideal response?
The exclusion of hydrophobic groups from the aqueous surface is called the hydrophobic effect.
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Alzheimer's disease and Parkinson's disease are both neurological diseases that result from ____
a. lack of acetylcholine production b. abnormal levels of specific neurotransmitters c. failure to remove neurotransmitters from the synaptic cleft d. too much dopamine production e. a failed reuptake of specific neurotransmitters
Which cells in the testes secrete testosterone?
a. Sertoli cells b. luteinizing cells c. glycoprotein cells d. interstitial cells e. sperm cells
Evolutionary change can occur when the frequency of alleles in a population changes. Which of the following describes a change in the allele frequency of a population due to chance?
A) founder effect B) bottleneck effect C) genetic drift D) gene flow
Trisomy 21, or Down syndrome, occurs when there is a normal diploid chromosomal complement but one (extra) chromosome 21. Although fertility is reduced in both sexes, females have higher fertility rates than males. Van Dyke et al. (1995; Down Syndrome
Research and Practice 3(2 ): 65—69 ) summarize data involving children born of Down syndrome individuals. Assume that children are born to a female with Down syndrome and a normal 46-chromosome male. What proportion of the offspring would be expected to have Down syndrome? A) One-third of the offspring would be expected to have Down syndrome. B) None of the offspring would be expected to have Down syndrome. C) Two-thirds of the offspring would be expected to have Down syndrome. D) One-half of the offspring would be expected to have Down syndrome. E) All the children would be expected to have Down syndrome.