Sometimes, chemical damage to DNA can occur just before DNA replication begins, not giving the repair system enough time to correct the error before the DNA is duplicated. This gives rise to mutation
If the cytosine in the sequence TCAT is deaminated and not repaired, which of the following is the point mutation you would observe after this segment has undergone two rounds of DNA replication?
(a) TTAT
(b) TUAT
(c) TGAT
(d) TAAT
(a)
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Conservation through restoration involves ____
a. completely excluding people b. people allowed only as temporary visitors c. some human residents and livestock grazing d. limited livestock grazing e. efforts to remove contaminants and other unnatural obstructions
Which of the following is a primary consumer?
a. tiger b. elephant c. eagle d. hyena e. snake
Plasmolysis occurs in plant cells when the soil or water contains low concentration of salts or
fertilizers. __________________ Indicate whether the statement is true or false.
Bones continue to lengthen throughout childhood and adolescence because
A) a growth plate is present in each epiphysis until the late teens. B) the production of cartilage for a lengthening bone occurs primarily on the inside of the growth plate. C) ossification cannot occur until after puberty. D) primary ossification occurs until death. E) the activity of osteoblasts cannot be reduced until adulthood.