Select the incorrectly-matched osmoregulatory organ and the organism that uses it.
A. Nephridia-annelids
B. Malpighian tubules-insects
C. Nephrons-sea urchins
D. Kidney--mammals
E. Protonephridia-flatworms
Answer: C
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A transposable element composed of an antibiotic resistance gene, a recombinase gene, and inverted repeats is identified in a bacterial genome. This element can be any of the following except
A. an integrated conjugative element. B. a composite transposon. C. an insertion sequence. D. a unit transposon.
Barnacles live a(n) ____ lifestyle
a. planktonic b. infaunal c. nektonic d. sessile e. mobile
Which of the following describes the earliest
protist found in the fossil record?
a. single-celled, free-swimming, asexual reproduction, red alga b. multi-celled, stationary, asexual reproduction, red alga c. multi-celled, free swimming, sexual reproduction, red alga d. multi-celled, stationary, sexual reproduction, red alga e. single-celled, stationary, asexual reproduction, red alga
Phylogenetic relationships, when determined solely by the study of comparative morphology, may be
incorrect due to a. morphological divergence. b. convergence. c. adaptive radiation. d. extinction. e. observer error.