Phytochrome is the pigment responsible for ____
a. thigmotropism
b. phototropism
c. gravitropism
d. photoperiodism
e. heliotropism
ANSWER: d
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A mutation of a segmentation gene can result in
A. duplication of body parts. B. missing body regions. C. replacement of one body part with another. D. altered expression of homeotic genes. E. A segmentation gene mutation can cause all of these changes.
Which of the following statements is not true concerning peptidyl transferase?
A) It is a ribozyme having catalytic activity. B) It catalyzes peptide bond formation. C) It moves the ribosome, so translation continues. D) It is associated with the large subunit of ribosomes. E) It requires no outside source of additional energy, such as ATP.
Which of the following types of mutation, resulting in an error in the mRNA just after the AUG start of translation, is likely to have the most serious effect on the polypeptide product?
A) a deletion of a codon B) a deletion of two nucleotides C) a substitution of the third nucleotide in an ACC codon D) a substitution of the first nucleotide of a GGG codon
The animal kingdom is a monophyletic grouping.
Answer the following statement true (T) or false (F)