An organism is classified in the kingdom Plantae. Which of the following must be true about the organism?
a) it reproduces asexually
b) it is prokaryotic
c) it has cells walls made of chitin
d) it is autotrophic
Ans: d) it is autotrophic
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In noncompetitive feedback inhibition
a. the products of the reaction block the active site of the enzyme. b. the products of the reaction at the end of the pathway bind to a site other than the active site of an enzyme at or near the beginning of the pathway and block enzyme activity indirectly. c. the substrate and cofactors compete for the active site. d. the inhibitor binds to and directly blocks the active site of the enzyme. e. enzyme activity is controlled by the reversible binding of a regulatory molecule.
Which of the following is TRUE in the Watson-Crick model of DNA?
A) Four different types of bases are found in DNA. B) Phosphate groups always bond to ribose. C) Ribose always bonds to a nitrogenous base. D) The number of adenines equals the number of guanines. E) During replication, the phosphate groups are copied but the base sequence is not copied.
Parallel evolution involves
A. any two organisms with the same trait. B. two organisms sharing the same trait because they have a common ancestor with that trait. C. two lineages acquiring the same trait independently without the trait being present in a common ancestor. D. possession of homologous structures. E. All of the choices are part of parallel evolution.
True or False: sRNAs can only regulate expression by binding mRNA
a. TRUE b. FALSE