Plants that grow and reproduce in one growing season are referred to as _________.
A. Immortal
B. Annual
C. Diennial
D. Biennial
E. Perennial
Ans: B. Annual
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An acoelomate is an animal that
A. has a coelom. B. has a pseudocoelom. C. has both a coelom and a pseudocoelom. D. has neither a coelom nor a pseudocoelom. E. has a coelom during early development but later loses it.
Which statement describes chromosomes?
a. Chromosomes are always spread out as chromatin. b. Chromosomes are always condensed. c. Homologous chromosomes have the same genes but can have different alleles. d. Homologous chromosomes always have the same alleles.
e. Chromosomes always consist of two sister chromatids.In the lac operon in E. coli, a nonsense mutation in the ________ gene will result in a loss of ß-galactosidase activity in the cell
A) lacZ B) lacI C) lacY D) Both A and B E) All of these
Alcohol-based compounds can weaken the outer membrane.
a. true b. false