#Question id: 1146
#Unit 4. Cell Communication and Cell Signaling
Which of the following general statement(s) about a G protein–coupled receptor is (are) TRUE?
#Question id: 2910
#Unit 2. Cellular Organization
With respect to the DNA methylation mechanism in mammalian cells, which of the following statements, if any, is true?
I. The principal role of the DNMT1 DNA methyltransferase is in de novo methylation.
II. The DNMT3A and DNMT3B DNA methyltransferases require hemi-methylated DNA as a substrate and are responsible for methylating nascent DNA strands that are complementary to methylated parental DNA strands.
III. Active DNA demethylation means removal of methyl groups from a hemi-methylated DNA double helix.
IV. DNA methylation is not essential in mammalian development.
#Question id: 7316
#Unit 5. Developmental Biology
Programmed cell death, or apoptosis, is an
essential part of animal development. In the nematode, with its invariant cell
lineage, particular cell lineages or particular cells within specific lineages
are destined to end in programmed cell death, and it was this feature that
allowed the identification of the process and the analysis of its genetic
control.
Which of the following combination of genes are correct?
#Question id: 3431
#Unit 11. Evolution and Behavior
In the territorial behavior of the stickleback fish, the red belly of one male elicits attack from another male by functioning as
#Question id: 2942
#Unit 2. Cellular Organization
During mitosis, the breakdown of the nuclear envelope depends on the: