Duplication can be advantageous for evolution. While the correctly functioning DNA segment remains intact, duplication provides new copies of genes that can be altered to new functions. Unfortunately, duplication can also result in human genetic
disorders. Please provide an example of a human genetic disorder that occurs when certain DNA sequences are duplicated.
What will be an ideal response?
Humans suffering from Fragile X syndrome have abnormally long repeats on their X chromosome. This makes the chromosome fragile, and it can easily break, causing mental retardation, hyperactivity, attention deficit, and large ears. Multiple repeats on the autosomal chromosome 9 can also cause mental retardation, squinting eyes, and bulbous nose.
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Fruits have contributed to the success of angiosperms by _____
A) nourishing the plants that make them B) facilitating dispersal of seeds C) attracting insects to the pollen inside D) producing sperm and eggs inside a protective coat E) producing triploid cells via double fertilization
When a usable organic electron donor is present, sulfate serves as a terminal electron acceptor during anaerobic respiration by ________.
A. Desulfonema B. Desulfovibrio C. Archaeoglobus D. All of the choices are correct.
Why do scientists insert their DNA of interest into the middle of the lacZ coding sequence?
a. It makes the bacteria resistant to the antibiotic. b. It provides a way for researchers to sort the bacteria that have the cloning plasmid from the bacteria that don't have the cloning plasmid. c. It aids scientists in developing new antibiotic treatments. d. It provides a way for sorting bacteria that have the gene of interest from the bacteria that just have an "empty" cloning plasmid. e. It makes the bacteria produce more clones.
Greenhouse gases __________ the escape of heat
energy by absorbing the energy of __________ wavelengths of light, and radiating much of it __________ Earth. a. enhance; longer; back toward b. enhance; infrared; back toward c. impede; infrared; back toward d. enhance; longer; away from e. impede; shorter; back toward