A photoautotrophic unicellular organism with a shell made of silica is most likely a(n) ________
A) apicomplexan
B) foram
C) dinoflagellate
D) diatom
D
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Brachiopods, phoronids, and bryozoans all have a ring of ciliated tentacles around the mouth. These animals are thus
grouped as: a. rotifers b. flatworms c. ctenophores d. lophophorates e. onychophorans
A strategy used by dissimilatory metal-reducing bacteria that enable their use of insoluble compounds as electron acceptors is to transfer electrons to the metal via external, intermediary compounds such as ________ found in the environment, or their own ________. These compounds are collectively known as ________.
What will be an ideal response?
Figures A and B show the effect of an early- and a late-acting mutation on the lifetime fitness of individuals. How would you graphically determine which of the two mutations had a greater effect on lifetime fitness? Limit your answer to one sentence
What will be an ideal response?
DNA and RNA are different types of nucleic acid polymer. Which of the following is true of DNA but not true of RNA?
(a) It contains uracil. (b) It contains thymine. (c) It is single-stranded. (d) It has 5?-to-3? directionality.