Mycobacterium tuberculosis is one of the few species of bacteria that
A. are encapsulated.
B. stain Gram-negative.
C. are acid fast.
D. stain Gram-positive.
C
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Protobionts are thought to be the first nonliving structures that evolved into living cells. A critical characteristic of a protobiont that is found in both modern day prokaryotes and eukaryotes is
A. internal compartments that subdivide metabolic functions. B. a boundary membrane that separates external from internal environments. C. the ability to exclude all organic substances. D. the ability to fuse with any other protobiont for reproduction. E. the ability to recognize other protobionts for developmental purposes.
An active hunter on the coral reef is a(n)
a. sponge. b. cnidarian. c. giant clam. d. octopus. e. crinoid.
For Mendel’s explanation of inheritance to be
correct, a. the genes for the traits he studied have to be located on the same chromosome. b. the combination of gametes at fertilization has to be due to chance. c. genes cannot be transmitted independently of each other. d. only diploid organisms demonstrate inheritance patterns. e. none of these apply.
Which lineage includes living members that are jawless vertebrates called lampreys, which are mostly parasitic as adults?
a. Urochordata b. Cephalochordata c. Petromyzontoidea d. Placodermi