Mutations are important because they do what?
(A) provide variation that can result in evolutionary change.
(B) occur in response to environmental demands.
(C) are always beneficial in the individuals affected by them.
(D) usually provide an individual with increased reproductive rates.
Ans: (A) provide variation that can result in evolutionary change.
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Indicate whether this statement is true or false.
Each photosystem in a eukaryotic plant __________
a. is composed of molecules of chlorophylls and carotenoids. b. possesses a light-gathering antenna complex c. has a specialized chlorophyll a molecule in its reaction center d. a)., b). and c). are all true. e. a)., b). and c). are all true, but only for Photosystem II.
The Law of Segregation states that:
A) gene pairs assort independently of each other during gamete formation. B) phenotypes are always determined by genotypes. C) differing characters are the result of either the homozygous dominant or the homozygous recessive condition. D) one allele of a pair must always be dominant and the other must always be recessive. E) differing characters in organisms result from two alleles that separate in gamete formation, such that each gamete gets only one of the two alleles.
The possible effect of failing to limit greenhouse gas emissions on the oceans is likely to be which of the following?
A. An increase in dissolved methane will hinder microbial growth. B. An increase in dissolved carbon dioxide will raise the pH. C. An increase in dissolved methane will stimulate microbial growth. D. An increase in dissolved carbon dioxide will lower the pH.