1.Which of the following organisms has a DNA sequence which shows that it is the

Question

1.Which of the following organisms has a DNA sequence which shows that it is the most closely related to humans on an evolutionary tree diagram?
a. a frog
b. a pig
c. a snake
d. yeast

2.Which of the following is a true statement about bacteria?
a. They consist of small cells, have a nucleus, and are sometimes multi-cellular.
b. They belong to the Kingdom Protista.
c. They are the least successful group of organisms on the planet today, and are on the verge of extinction.
d. They belong to the Domain Eukarya.
e. There are more bacteria on and in you than you have human cells.

3.An example of homologous structures is:
a. a fish's fin and a birds wing.
b. an insect's wing and a bat's wing.
c. a dog's front leg and a dolphin's flipper.
d. a dolphin's flipper and a penguin's flipper.
e. a horse's front leg and a horse's tail.

4.Currently, of all of the taxa, the most inclusive (largest) is ____________.
a. Orders
b. Domains
c. Kingdoms
d. Phlylum
e. Species

Explanation / Answer

1) The correct option is b. a pig.
Both pigs and humans are mammals. They are most closely related to each other.
2) The correct option is e. There are more bacteria on and in you than you have human cells.
There are 10 times more bacterial cells in your body than human cells.
3) The correct option is c. a dog's front leg and a dolphin's flipper.
Homologous structures are anatomically similar and ahve different functions.
4) The correct option is c. Kingdoms.
The kingdom is the largest and most inclusive (includes) of the taxonomic categories.

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