An enzyme
A) decreases the rate of a reaction.
B) binds substrates in a manner that facilitates the formation of product.
C) changes the position of the equilibrium of the reaction.
D) does not change the rate at which the equilibrium is achieved.
E) is always a protein.
B) binds substrates in a manner that facilitates the formation of product.
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If speciation occurred because of changes in chromosome counts between the original parents and the offspring, would this be an example of speciation by natural selection?
A. Yes, because all speciation events involve natural selection. B. Yes, because there is genetic variation present due to differences in chromosome numbers. C. Yes, because natural selection is involved whenever there is a difference in the genome size between the parents (species 1) and the offspring (species 2). D. No, speciation occurred, but natural selection was not involved. E. No, natural selection can only act on populations, not on individuals.
Late mRNA products in T4 phage include
A. phage structural proteins. B. proteins involved in cell lysis and phage release. C. proteins that help with phage assembly without becoming part of the virion. D. All of the above are correct.
Asexual reproduction in ascomycetes takes place by means of
A. ascogonia. B. ascospores. C. conidia. D. motile gametes. E. zygospores.
Mature plants may become __________ in dry or cold seasons in order to survive long periods that are unfavorable for growth.
A. dormant B. dehydrated C. photoperiodic D. thigmonastic E. gravitropic