If a mutation prevented the formation of lignin, which tissue would be most affected?
a. vascular cambium
b. parenchyma
c. collenchyma
d. sclerenchyma
e. mesophyll
ANSWER: d
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Most of the Archaea are phenotypically quite similar
Indicate whether the statement is true or false.
Which of the following is generally notinvolved in gene inactivation by histone modification?
A. Modification leads to chromatin condensation. B. The RNA polymerase associated with the gene dissociates from DNA when HDACs bind to the corepressor. C. Increased acetylation of the nucleosomes occurs in the vicinity of the gene. D. Increased methylation of the nucleosomes occurs in the vicinity of the gene.
Which type of plants will run the C4 cycle during the day and the Calvin-Benson cycle at night? a. C4 b. CAM c. C3 d. None of them run the C4 cycle during the day and the Calvin-Benson cycle at night
e. All of them run the C4 cycle during the day and the Calvin-Benson cycle at night.
During in vitro fertilization, the fertilized egg ____
a. is enucleated and fused with a donor egg b. develops in a Petri dish to form an embryo containing 64 to 128 cells c. develops in a Petri dish to form an embryo containing four to eight cells d. develops in the host animal and eventually results in a clone born to the host e. undergoes a second fertilization with a donor animal’s sperm