Biology

An ecologist is studying all the animals, plants, fungi and bacteria, as well as the interaction among them, in a forest? He is studying the _________ in the forest.

Question 13 options:

niche
biome
community
population

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Question 14 (1 point)

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The temperature optimum for an enzyme is 37C. What will most likely happen if you increase the temperature from 37C to 50C?

Question 14 options:

  The enzyme activity will not be affected
  The enzyme activity will increase
  The enzyme activity will decrease
   The pH will increase

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Question 15 (1 point)

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When celery is placed in a glass of pure water the solution inside its cells is _____ compared to the water.  

Question 15 options:

    selectively permeable
    isotonic
 hypertonic
hypotonic

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Question 16 (1 point)

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An ecosystem can be characterized as:

Question 16 options:

populations + community.
all species, population, and community interactions for organisms in a given area.
the abiotic components of the environment.
 all of the biological interactions, plus interactions with the abiotic environment, in a given area.

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Question 17 (1 point)

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In October of 2003, a raging wildfire swept through the mountain ecosystems in Southern California, burning everything in its path to the ground and driving away all of the animals. In order for the mountain ecosystem to re-establish itself, which member of the food web has to return first?

Question 17 options:

deer
coyotes
snake
grasses

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Question 18 (1 point)

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Carbohydrates are not

Question 18 options:

stored potential energy
made mostly of nitrogen and carbon.
broken down by cellular respiration.
made by producers.

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Question 19 (1 point)

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A primary consumer would eat:

Question 19 options:

secondary consumers
plants.
Bacteria.
rabbits.

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Question 20 (1 point)

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Diffusion is

Question 20 options:

1. One type of active transport
1. The movement of water across the cell membrane
1. The movement of molecules from an area of high concentration to an area of low concentration
1. The movement of molecules from an area of high concentration to an area of low concentration

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Question 21 (1 point)

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Any individual organism has the potential to adapt to its environment, if it is given enough time and possesses a mechanism to generate variation.

Question 21 options:

True
False

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Question 22 (1 point)

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Humans are more likely to be infected by viruses after the viruses had a chance to multiply outside the body on surfaces touched by infected people.

Question 22 options:

True
False

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Question 23 (1 point)

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Once an adaptation appears, it remains in all the descendants unless the species becomes extinct

Question 23 options:

True
False

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Question 24 (1 point)

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During a time when resources are abundant, one would not expect much evolutionary change to happen.

Question 24 options:

True
False

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Question 25 (1 point)

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When a founder population has a small gene pool, evolutionary change is more likely to be rapid than if the founder population has a large gene pool.

Question 25 options:

True
False

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Question 26 (1 point)

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When speciation occurs, the result is a dramatic change in the new species.

Question 26 options:

True
False

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Question 27 (1 point)

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When two groups are reproductively isolated, it can be predicted that speciation will soon follow.

Question 27 options:

True
False

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Question 28 (1 point)

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Fossil evidence suggests that human ancestors arose one time in Africa.

Question 28 options:

True
False

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Question 29 (1 point)

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Levels of ultraviolet light influences vitamin D production is humans.

Question 29 options:

True
False

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Question 30 (1 point)

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Mitochondria and chloroplasts of eukaryotic cells are very similar to prokaryotes

Question 30 options:

True
False

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Question 31 (1 point)

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Organisms that live in habitats with high levels of competition are more likely to produce defensive chemicals than those that live with little competition.

Question 31 options:

True
False

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Question 32 (1 point)

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The human population may continue to increase even though it surpasses carrying capacity.

Question 32 options:

True
False

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