Sulfate- or sulfur-reducing bacteria (SRB) are united by their ability to reduce ________ or ________ and other oxidized sulfur compounds to ________ during anaerobic respiration.
What will be an ideal response?
elemental sulfur, sulfate, hydrogen sulfidehydrogen sulfide
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Plants as well as brown, green, and red algae show a basic life cycle which involves the alternation of generations between a(n)
A. spore and pollen. B. megaspore and a microspore. C. seed and a cone. D. sporophyte and a gametophyte. E. egg and a sperm.
Which of the following is not true regarding the structure of RNA?
a. RNA contains the same four nucleotide bases as DNA. b. RNA contains ribose. c. RNA is single stranded. d. RNA in general is a helper to DNA. e. There are different types of RNA, each with a different function.
The aptly named dead horse arum has a heat-producing flower. What advantage does this heat provide?
A) It enables blooms to emerge through snow. B) It prevents inefficient pollinators from collecting pollen. C) It warms the pollinators, which are usually bats. D) It creates a barrier to invasive plant species. E) It increases the evaporation of the scent, attracting pollinators from greater distances.
Despite your best attempts to convince her otherwise, your friend is very afraid of spiders and all "bugs," which to her means insects. When you note that spiders are not insects, she claims they are the same thing. You finally convince her that spiders are not insects because, for one thing, spiders
A. lack an exoskeleton. B. are segmented. C. have a calcium-carbonate layer outside the exoskeleton. D. have two body segments joined by a pedicel.