Three human disorders—fragile X syndrome, myotonic dystrophy, and Huntington's disease–are conceptually linked by a common mode of molecular upset. Describe the phenomena that link these disorders
What will be an ideal response?
All three are caused by disparate genes, but each gene was found to contain repeats of a unique trinucleotide sequence. In addition, the number of repeats may increase in each subsequent generation (genetic anticipation).
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Which of the following is the fundamental organizational unit of structure and function in living things?
a. Atoms b. Molecules c. Cells d. Organelles
Park officials needed to repair the old mill dam in a state park and so had to drain the pond behind it, killing all the animals and many of the plants in the water
After the pond reformed and many years passed, a certain species of fish established itself in the pond and remained there for more than 400 years. Which most directly describes the role of that type of fish? A) climax species B) pioneer C) producers D) invaders
Which of the following is CORRECT about the prokaryotes known as deeply branching bacteria?
A) They are chemoheterotrophs. B) They lack peptidoglycan walls. C) They are commonly found in acidic, anaerobic conditions. D) They grow in long branching filaments. E) They are photosynthetic.
Which statement is incorrect?
A) Only living things maintain homeostasis. B) Only living things contain nucleic acids, proteins, carbohydrates, and lipids. C) Only living things can grow. D) Only living things are composed of cells.