List the correct order of steps of morphogenesis in Drosophila melanogaster.

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a. Establishment of anterior/posterior axes
b. Gap genes divide the body into broad regions
c. Pair-rule genes are activated in order to develop a preliminary segmentation pattern
d. Homeotic genes determine which body parts arise from each region

Biology & Microbiology

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Explain our present understanding of molecular adaptations to the cytoplasmic membrane that are present in psychrophiles

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Biology & Microbiology

Nitrifying Archaea such as Nitrosopumilus maritimus use ________ as a sole carbon source and are capable of obtaining sufficient energy by aerobically oxidizing ________

A) CO2 / NO B) sugars / NH3 C) CO2 / NH3 D) organic acids / NO

Biology & Microbiology

The endosymbiotic theory says that precursor eukaryotic cells acquired cilia by endosymbiosis with a(n) ________ ancestor and others gained photosynthetic ability from endosymbiosis with a(n) ________ ancestor.

A. helminth, algal B. spiral, cyanobacterial C. protozoan, algal D. archaeal, cyanobacterial

Biology & Microbiology

Which function earlier in development: maternal-effect genes or zygotic genes?

What will be an ideal response?

Biology & Microbiology