#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
#Question id: 7767
#Unit 5. Developmental Biology
How can evolution select for phenotypes that postpone reproduction or sexual maturity?” There is often a trade-off between reproduction and maintenance, and in many species reproduction and senescence are closely linked. Recent studies of mice, Caenorhabditis elegans, and Drosophila suggest that there is a conserved genetic pathway that regulates aging and that it can indeed be selected for. This pathway involves the response to insulin and insulin-like growth factors, Name of these transcription factors are
#Question id: 5528
#Unit 5. Developmental Biology
The lining of the uterus in which the mammalian embryo implantationsTakes place called as
#Question id: 163
#Unit 1. Molecules and their Interaction Relevant to Biology
Which of the following statements about cystine is correct?
#Question id: 11703
#Unit 7. System Physiology – Animal
A female athlete who took testosterone-like steroids for several months stopped having normal menstrual cycles. What is the best explanation for this observation?