Which of the following are mineralized biological structures/mateials? Please select all that apply.

a) Glycosaminoglycans

b) Bone

c) Pectins

d) Diatom cell walls

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#Question id: 12878

#General Aptitude

The radii of two solid iron spheres are 1 cm and 6 cm respectively.A hollow sphere is made by melting the two spheres. If the external radius of the hollow sphere is 9 cm, then its thickness (in cm) is

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#Question id: 4754

#Unit 8. Inheritance Biology

Allele A is epistatic to allele B. Which of the following statement are incorrect?

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#Question id: 11393

#Unit 9. Diversity of Life Forms

Given that the enzymes that catalyze nitrogen fixation are inhibited by oxygen, what are two ʺstrategiesʺ that nitrogen-fixing prokaryotes might use to protect these enzymes from oxygen?

1.  couple them with photosystem II (the photosystem that splits water molecules)

2.  package them in membranes that are impermeable to all gases

3.  be obligate anaerobes

4.  be strict aerobes

5.  package these enzymes in specialized cells or compartments that inhibit oxygen entry

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#Question id: 5112

#Unit 5. Developmental Biology

Inward movement of an expanding outer layer spreading over the internal surface during gastrulation is termed as

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#Question id: 4331

#Unit 3. Fundamental Processes

In eukaryotic cells, transcription cannot begin until