In humans, a normal egg or a normal sperm carries _____ chromosomes each.
A. 23
B. 33
C. 46
D. 56
A. 23
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Seth purchased five pounds of live crayfish and realized that the outer shells were made of a tough carbohydrate similar to that used to make the carapace of a cockroach. What do you think the outer shells of the crawfish are made of?
A. Glycogen B. Chitin C. Amylopectin D. Cellulose E. Fibrin
Scientists may compare similarities between nucleotide sequences of organisms to determine their evolutionary
history. This is known as: a. cladistics. b. phenetics. c. synapomorphy. d. molecular systematics. e. monophyletic grouping.
In cells, RNAs that can act like enzymes are called __________.
A. microRNAs B. peroxisomes C. ribozymes D. lysosomes
If the apple and haw flies no longer interbreed due to the different ripening times of apples and hawthorns, this would be an example of what kind of reproductive isolating mechanism?
A) temporal isolation B) ecological isolation C) gametic isolation D) mechanical isolation E) behavioral isolation