Base analogs may cause mutations because
A) they modify the chemical structure and properties of the normal base.
B) they insert themselves between adjacent bases on the DNA strand and cause an extra base to be inserted during replication.
C) they remove amino groups from bases, causing them to pair with the wrong base during replication.
D) they may exist in alternate chemical states that pair with different DNA bases than the normal state during replication.
E) Both A and C
D
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Describe the main functions of the four basic tissues.
(a) Epithelial tissue: (b) Connective tissue: (c) Muscle tissue: (d) Nervous tissue:
After the first meiotic division, the two daughter cells ____
a. are identical to each other b. replicate their DNA before dividing again c. contain unequal chromosome numbers d. have half the diploid number of chromosomes e. always contain equal numbers of paternal and maternal chromosomes
Which of the following is NOT true concerning the
spirochetes? a. Some live inside a host organism. b. Some form endospores that germinate in wounds. c. All are free-living. d. Some are pathogens carried by vectors. e. Some cause Lyme disease.
You see a plot of plants that is very dense and small and another plot of the same species with fewer individuals but larger individual plants. What might be the cause of this pattern?
A) herbivory B) contest competition C) water availability D) intraspecific competition