Which of the following are true statements regarding

the use of DNA in evolutionary comparisons?
a. Lineages have a mixture of ancestral and novel
characters.
b. Mutations inevitably change those sequences
over time.
c. Mutations occur randomly.
d. Most mutations are neutral.
e. All of these are true.


Answer: e

Biology & Microbiology

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An egg of the organism of S. mansoni is isolated from the feces of an adult man who has been traveling in Africa. An unoperculated egg with a large lateral spine is recovered. The patient is administered the standard dose of praziquantel; however, his infection does not improve. Which one of the following statements explains this discrepancy?

a. Metrifonate should have been adminis-tered. b. Bilarcil is the drug of choice for this type of infection. c. Steroids should have been initially admi-nistered. d. A larger dose may be required to be effec-tive against this organism.

Biology & Microbiology

Which of the following are considered more

primitive based upon the structure of their limbs? a. bats b. reptiles c. porpoises d. penguins e. birds

Biology & Microbiology

Dihybrid cross

What will be an ideal response?

Biology & Microbiology

An increase in the number of chromosomes present in an organism is known as 

A. polyploidy. B. gene flow. C. convergent evolution. D. punctuated equilibrium.

Biology & Microbiology