The fossil record is incomplete because
a. very few organisms were preserved as fossils.
b. organisms tend to decay before becoming a
fossil.
c. animals with hard parts are preserved more
easily.
d. geologic processes may destroy fossils.
e. all of these are true.
Answer: e
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Feeding chickens a strain of Bacillus subtilis leads to
A. increased body weight and feed conversion. B. lower carriage of the pathogenic E. coli strain O157:H7. C. a reduction in coliforms and Campylobacter in the processed carcasses. D. increased body weight and feed conversion and a reduction in coliforms and Campylobacter in the processed carcasses. E. All of the choices are correct.
Which of the following statement is not correct about DNA replication?
A. Only genes are replicated in DNA replication B. It happens in the nucleus C. It is semi-conservative D. It involves DNA polymerase
Muscles can only __________ on bones, never __________
Fill in the blank(s) with the appropriate word(s).
Animals are thought to have descended from choanoflagellate protists. Which poriferan cell type lends evidence to this claim?
A. Amoebocyte B. Gamete C. Choanocyte D. Spicule