The chemical colchicine prevents the formation of microtubules. It is commonly used in certain experimental procedures to cause changes in cellular chromosomes. Which of the following changes is it likely to be used to create?
A) Induction of mutant polyploid individuals
B) Induction of mutant aneuploid individuals
C) Prevention of nondisjunction in cell cultures
D) Induction of chromosomal deletions in experimental cell lines
E) Induction of chromosomal duplications in experimental cell lines
A
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Which type of plant hormone is primarily responsible for inhibiting leaf abscission?
a. gibberellins b. ethylene c. jasmonates d. abscisic acid e. auxins
What kind of bond is formed between successive amino acids during translation?
A) ionic bond B) phosphodiester bond C) hydrogen bond D) disulfide bond E) peptide bond
E. coli is a rod-shaped bacterium found in the human intestine
Indicate whether the statement is true or false
A form of gene regulation that occurs while RNA is still in the nucleus is
A. differential intron removal and exon splicing. B. feedback control. C. rate of binding to ribosomes. D. enzymatic cleavage of a polypeptide.