BIOL 2153 : Bio 1202 Final 1
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Describe the theory of natural selection Which of thefollowing BEST describes the theory of natural selection? CHOOSEONE
| 1 The genetic make-up of apopulation gradually changes from one generation to the next. | |
| 2 Living organisms change overtime. | |
| 3 Each species produces many moreoffspring than can survive long enough to reproduce. The offspringthat do survive contain genes that are inherited from theparents. | |
| 4 There is variation among themembers of a species. Some of this variation is geneticallydetermined and so can be passed on to future generations. | |
| 5 Some individuals have genes thatincrease their chances for survival and reproduction. Theseindividuals are more likely to reproduce and pass on their genes,causing their genes to become more common in the nextgeneration. | |
| 6 There is a struggle for existenceamong the members of a population. |
The Cambrian explosion is a prime example of ________________.
| mass extinction | ||
| evolutionary stasis | ||
| a large meteor impact | ||
| adaptive radiation |
1 points
QUESTION 2
Most animals are viviparous.
True
False
1 points
QUESTION 3
The first phylum with ganglia in their nervous system are the ________________________.
| Mollusca | ||
| Nematoda | ||
| Bivalvia | ||
| Platyhelminthes |
1 points
QUESTION 4
The last common ancestor of all animals was probably a _____________________.
| a unicellular worm | ||
| multicellular algae | ||
| flagellated protist | ||
| multicellular fungus |
1 points
QUESTION 5
You are given an unknown organism to identify. It is unicellular and heterotrophic. It is motile by use of many short extensions of the cytoplasm. It has well-developed organelles and two nuclei, one large, one small. The organism is most likely to be a ______________.
| foraminifera | ||
| radiolarian | ||
| ciliate | ||
| flagellate |
1 points
QUESTION 6
Which of the following organisms would you expect to have the largest surface-area-to-volume ratio? Assume that all of the following are the same total length.
| A mollusc | ||
| A nematode | ||
| A platyhelminth | ||
| Not enough information to determine. |
1 points
QUESTION 7
If the animal is a hermaphrodite, it is said to be _______________.
| dioecious | ||
| eutelic | ||
| monoecious | ||
| trioecious |
1 points
QUESTION 8
A terrestrial animal species is discovered with the following larval characteristics: exoskeleton, system of tubes for gas exchange and segmentation. A knowledgeable zoologist should predict that the adults of this species would also feature ____________.
| eight legs | ||
| two pairs of antennae | ||
| a sessile lifecycle | ||
| an open circulatory system |
1 points
QUESTION 9
The Phylum Echinodermata exhibits metamerism.
True
False
1 points
QUESTION 10
The existence of evolutionary trends, such as increasing body sizes among horse species, is evidence that _____.
| a larger volume-to-surface area ratio is adaptive in many mammals | ||
| evolution generally progresses toward some goal | ||
| evolution tends toward increased complexity or increased size | ||
| in particular environments, similar adaptations can be beneficial to more than one species |
1 points
QUESTION 11
Suppose you are a researcher fro a pest-control company and you develop a chemical that inhibits the develpment of an embryonic mosquito's endodermal cells. Which of the following would cause the pesticide to work?
| The mosquito would develop a weak exoskeleton, making it easy prey. | ||
| The mosquito's gut would not function properly and it would starve. | ||
| The mosquito would not have a properly functioning muscular system. | ||
| Nothing would happen and your experiment would be a failure. |
1 points
QUESTION 12
Holometabolis refers to complete metamorphosis.
True
False
1 points
QUESTION 13
Which of these conditions are always true of populations evolving due to natural selection?
Condition 1: The population must vary in traits that are heritable.
Condition 2: Some heritable traits must increase reproductive success.
Condition 3: Individuals pass on most traits that they acquire during their lifetime.
| Condition 1 only | ||
| Condition 2 only | ||
| Conditions 1 and 2 | ||
| Conditions 2 and 3 |
1 points
QUESTION 14
Scientific theories _____. 22.3
| are nearly the same things as hypotheses | ||
| are supported by, and make sense of, many observations | ||
| cannot be tested because the described events occurred only once | ||
| are predictions of future events |
1 points
QUESTION 15
The evolution of animal species and their diversity is a result of the evolution of new and different ways to _______________.
| reproduce | ||
| arrange their cells into tissues | ||
| become symmetrical | ||
| form an embyro and establish a basic body plan |