Which of the following statements about homeotic genes is true?
a. All homeotic genes encode enzymes for metabolic pathways that produce pigments affecting eye and body color
b. All homeotic genes encode transcription factors with a homeodomain that can bind to a promoter.
c. Homeotic genes encode enzymes that allow Drosophila to break down and digest fructose.
d. Homeotic genes are believed to have evolved recently as they are not interchangeable between most species.
b
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Capsules are particularly important for
A) making bacteria more vulnerable to host defense mechanisms. B) making bacteria less pathogenic. C) protecting bacteria from host defense mechanisms. D) allowing bacteria to become more phagocytic.
Huntington’s disease (HD) is a fatal neurological disease that is inherited in an autosomal dominant manner. Most people with HD develop signs and symptoms in their late 30s or early 40s, but the onset of disease may be earlier or later in life. A 20-year-old woman comes to your genetic counseling center because she knows that HD occurs in members of her family. Her paternal grandfather was afflicted, but so far her 41-year-old father shows no symptoms. Her two great-great grandmothers on her father's side were healthy well into their 90s, and one of her great-great grandfathers died of unknown causes at 50. Testing for HD is extremely expensive, but she is concerned that she may fall victim to this disease and wants to plan her life accordingly.
After examining her pedigree you advise her to A. get tested because there is no possibility that she does not carry the HD allele. B. not get tested because only males in her family get the disease. C. get tested because her father could be heterozygous for the HD allele. D. not get tested because her father is at worst, heterozygous for the HD allele. E. not get tested because her father shows no symptoms.
Which one of the following statements CORRECTLY describes the relationship between an atom and an element?
A) An element is the fundamental unit of an atom. B) An element is composed of atoms that are joined together by ionic and covalent bonds. C) An atom is composed of different elements that are joined together by ionic and covalent bonds. D) An atom is the smallest unit of an element that demonstrates all of the properties of that element.
Joe cut his finger on a sharp twig and now is experiencing dolor. This means
A. pain. B. swelling. C. loss of function. D. redness. E. warmth.