Why are dwarf pea plants shorter than other pea plants?
a. because they produce very little gibberellin hormone
b. because they have an altered gibberellin amino acid sequence
c. because the enzymes involved in gibberellin synthesis are missing
d. because they cannot make any gibberellin
Ans: a. because they produce very little gibberellin hormone
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Suppose you wanted to investigate ideas on how polymerization of prebiotic organic molecules may have occurred on the early Earth. Which of the following scenarios might best be utilized for this?
A. Mix some RNA nucleotides in water and heat them to boiling temperatures. B. Mix some amino acids (protein building blocks) in water and add a strong acid or a strong base. C. Mix some RNA nucleotides in water and repeatedly wet and dry them on clay. D. Mix some amino acids (protein building blocks) in water and add a bacterium harmless to humans. E. Mix some amino acids in salt water and cool down to 0? C.
Where in a plant cell is chlorophyll found?
a. on the outer chloroplast membrane b. inside the mitochondria c. in the stroma d. in the thylakoid membrane e. in the plant cell wall
Microtubules contribute to each of the following except
A) intracellular transport. B) the human red blood cell disklike shape. C) orientation of plant cellulose microfibrils. D) filopodial structure. E) mitotic spindles.
During transcription elongation, how many pyrophosphate molecules are produced from the incorporation of 20 ribonucleoside monophosphates?
A. 20 B. 60 C. 40 D. 5