match the following

A. endosteal niche	1. versatile cells that both generate bone and control the differentiation of HSCs
B. osteoblasts	2. line the blood vessels and also regulate HSC differentiation
C. reticular cells	3. send processes connecting cells to bone and blood vessels, and, unexpectedly
D. sympathetic neurons	4. can control the release of hematopoietic cells from the bone marrow.

#Question id: 28573

#Unit 5. Developmental Biology

Rspo1 binds to its cell membrane receptor and further stimulates which of the following pathway? 

#Question id: 24531

#Unit 11. Evolution and Behavior

In some fruit-fly populations, two alleles are present at the locus that encodes ADH; Adhf, and Adhs , Female fruit flies with different Adh genotypes produce the following numbers of offspring;

Calculate the relative fitness of females having these genotypes?

#Question id: 7197

#Unit 5. Developmental Biology

Following statements are regarding to PAR proteins and the establishment of polarity during early development in nematodes.

A. The internal cytoplasm contains PAR-3, PAR-6, and PKC-3, and the cortical cytoplasm contains PAR-2 and PAR-1.

B. PAR-3 and PAR-6, interacting with the protein kinase PKC-3 are uniformly distributed in the cortical cytoplasm. PKC-3 restricts PAR-1 and PAR-2 to the internal cytoplasm by phosphorylating them.

C. Once PAR-1 is in the cortical cytoplasm, it phosphorylates PAR-3, causing PAR-3 (and its binding partner, PKC-3) to leave the cortex.

D. During first cleavage, the metaphase plate is closer to the posterior, and the fertilized egg is divided into two cells, one having the anterior PARs (PAR-1 and PAR-2) and one having the posterior PARs (PAR-3 and PAR-6).

Which of the following statements are correct?

#Question id: 19920

#Unit 13. Methods in Biology

#Question id: 168

#Unit 1. Molecules and their Interaction Relevant to Biology

 The peptide alanylglutamylglycylalanylleucine has: