The ____ hypothesis states that mitochondria and chloroplasts evolved from bacteria
a. invagination
b. exosymbiont
c. membrane folding
d. captured bacteria
e. endosymbiont
ANSWER: e
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What is the function of the contractile vacuole?
A. to help single-celled organisms maintain homeostasis in a hypotonic environment B. to help single-celled organisms change shape in response to environmental changes C. to help maintain water balance for singlecelled organisms living in a hypertonic environment D. to maintain cell shape through turgor pressure
One of the major characteristics of life is reproduction. There are two types of reproduction: asexual and sexual reproduction. Compare the advantages and disadvantages of both types of reproduction. What do you think is the benefit of sexual reproduction that makes it so much more prevalent among living things?
What will be an ideal response?
Molecular motors working with microtubules:
a. Are calcium-dependent ATPases b. Use microtubule singlets and doublets c. Use microtubule singlets and triplets d. Two of the above e. None of the above
Peer review is essential to the scientific process because
A) several experts in the field are able to scrutinize a finding before it can be published. B) the process immediately validates any hypotheses tested in the experiments. C) the process can lead to improvements in articles prior to being published. D) it is the primary means for informing the general public about new information in the field. E) it tests hypotheses proposed by other investigators.