Which of the following statements is
CORRECT about enzymes?
a. Most enzymes are proteins.
b. Enzymes speed up reactions that are
intended to happen anyway.
c. Enzymes do not change the output of a
reaction.
d. Enzymes can perform over and over.
e. All of these are correct
E
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A scientist wants to study histones. Histones are:
A. proteins that double-stranded DNA molecules wrap around in eukaryotes. B. proteins that double-stranded DNA molecules wrap around in prokaryotes and eukaryotes. C. proteins that regulate checkpoints in the mitotic cell cycle. D. proteins that serve as the spindle fiber to pull sister chromatids apart during anaphase. E. proteins that required for the activity of Cdk enzymes.
In the universal ABO blood grouping system, there are four phenotypes - A, B, AB, and O - which are determined by
three different alleles. The presence of three alleles in the ABO blood grouping system is an example of ____.
a. a polymorphism b. genetic drift c. the bottleneck effect d. a dimorphism e. the founder effect
A nauplius larva is characteristic of:
A. echinoderms. B. gastropods. C. molluscs. D. crustaceans. E. ctenophores.
Some plants reproduce asexually through horizontal stems called
A. rhizomes. B. suckers. C. runners. D. both runners and rhizomes.