In the Drosophila ovary,
which of the following proteins is secreted from the cap cell and is
responsible for creating and maintaining the niche for germ-line stem
cells______?
A: Hedgehog
B: FGF
C: Arm
D: Ptc
which of the following proteins is secreted from the cap cell and is
responsible for creating and maintaining the niche for germ-line stem
cells______?
A: Hedgehog
B: FGF
C: Arm
D: Ptc
举一反三
- . In the Drosophila ovary, which of the following proteins is responsible for creating and maintaining the niche for germ-line stem cells?a. Hedgehogb. FGFc. Armd. Ptc A: a B: b C: c D: d
- Which of the following is a germ cell? A: cells of the gonads B: intestinal cells C: sperm and eggs D: zygotes
- Which of the following is NOT true of interleukins? () A: They<br/>are cytokines which can be produced by various cells of the immune<br/>system. B: They<br/>are hormones which allow one cell to communicate with another cell. C: They<br/>are in need of receptors on the target cell in order to mediate their<br/>effects. D: They<br/>are able bind antigen with a high level of specificity. E: They<br/>are able to modulate various aspects of the B-cell arm of immune<br/>system.
- 【植】以下细胞中发育潜能最大的是()。 A: Totipotent<br/>stem cell B: Pluripotent<br/>stem cell C: Oligopotent<br/>stem cell D: Unipotent<br/>stem cell
- Which of the following cell types is glioma derived from? A: Astrocytes B: Oligodendrocytes C: Neural stem cells D: Any of the above