A porcupine eats 3,000 J of plant material. 1,600 J is indigestible and is eliminated as feces. 1,300 J are used in cellular respiration. What is the approximate production efficiency of this animal?

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#Question id: 7072

#Unit 5. Developmental Biology

Formation of  Henson’s node takes place by:

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#Question id: 27968

#Unit 1. Molecules and their Interaction Relevant to Biology

As intermediates of the citric acid cycle are removed to serve as biosynthetic precursors, they are replenished by

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#Question id: 2816

#Unit 2. Cellular Organization

Which of the following mutations can result in a reduction of β-galactosidase?

a. a mutation in adenylate cyclase

b. a mutation in catabolite activator protein (CAP)

c. a mutation in the CAP site in the lac control region

d. a mutation in the repressor binding site in the operator

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#Question id: 10422

#Unit 6. System Physiology – Plant

Arabidopsis contains five genes encoding phytochromes, PHYA–PHYE, four of the five phytochromes appear mostly light-stable in the plant and function primarily in the regulation of LFRs and of shade avoidance involving changes in the R:FR ratio.

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#Question id: 5436

#Unit 8. Inheritance Biology

Quantitative characteristics arise from two phenomena either polygenic or environmental influence on genotype. Which of the following is not character of quantitative polygenic trait?