Which of the following causes of mutations is incorrectly matched with its mechanism of action?
a. Spontaneous mutations: mistakes arise as long strands of DNA are duplicating themselves.
b. Radiation-induced mutations: energy disrupts atomic structure and breaks apart chromosomes.
c .Chemical-induced mutations: chemicals react with atoms in DNA molecules and induce mutations.
d. Spontaneous mutations: enzymes cause errors due to their highly erroneous nature.
e. None of the above is incorrectly matched with its mechanism of action.
Ans: d. Spontaneous mutations: enzymes cause errors due to their highly erroneous nature.
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Assume a portion of the daf-2 gene has the following DNA sequence: TACCCGAAGTTC
Which of the following mutations will likely have the greatest impact on the longevity of elegans? a. TACCCAAAGTTC b. TACCCGAAATTC c. TACGCGAAGTTC d. TACCCGAAGAAA
Under which of the following taxonomic levels do animals fall?
a. species b. order c. class d. kingdom
Which of the following is NOT true?
a. Down syndrome is an example of aneuploidy. b. The majority of cases of human sex chromosome abnormalities may never be diagnosed. c. Most embryos with a normal chromosome number miscarry. d. Aneuploidy is usually fatal in humans. e. Aneuploidy typically arises through nondisjunction.
The major divisions of the peripheral nervous system
are the a. somatic and autonomic systems. b. sympathetic and parasympathetic systems. c. peripheral and central systems. d. afferent and autonomic systems. e. cranial and skeletal nerves.