science

Question 1

In the disease prevention unit, students are learning about how researchers link a certain strain of bacteria to the occurrence of a specific disease. Which of the following is the strongest evidence that a strain of bacteria is the cause of a particular disease?

a) the bacteria have been show to be susceptible to the lethal effects of antibiotics such as penicillin
b) the bacteria can be isolated from all individuals exhibiting disease symptoms but not from unaffected individuals

Answer 1

b) the bacteria can be isolated from all individuals exhibiting disease symptoms but not from unaffected individuals
because they are trying to establish a cause-and-effect relationship
(013)

Question 2

in 2nd grade life science unit, students are observing plants and animals present in their school environment
which activity utilizing educational technology would be most appropriate for strengthening the students’ understanding of these organisms?

Answer 2

having students photograph local plants and animals (capture details, increase interest) with digital cameras (appropriate grade) and using the photos to create a class field guide that describes each organism (promote understanding of characteristics and names)

(013)

Question 3

A species of small bird rides on the back of elephants. insects in the fields are eaten by the bird. the elephant does not benefit, but is unbothered. their relationship is an example of…

Answer 3

commensalism: a type of symbiotic relationship (one benefits, one unbothered)
(015)

Question 4

what do the types of symbiotic relationships mean?
commensalism
mututalism
symbiosis
sea anemone
amensalism
competititon
parasitism
predation
coral reef

Answer 4

commensalism = one benefits, one unaffected
mutualism = depend on each other
symbiosis = long term relationship between 2 species
sea anomemone = provide a lot 10/10 habitat
amensalism = one harmed, one unaffected
parasitism = depends on host for basic needs, typically smaller than host and numerous
predation = one kills the other

Question 5

in addition to providing structural support, cell walls (do)…

Answer 5

enable cells to withstand significant internal water pressure without rupturing
(015)

Question 6

the term “spring tide” refers to a high tide that is slightly higher in depth than average and a low tide that is slightly lower in depth in average. earth is most likely to experience a spring tide when…

Answer 6

the sun, moon, and Earth are situated in a straight line
(the gravitational pull is added to the moon, so it makes especially high sides and especially low times.
both full moon and new moon phases = brings this alignment)