Which of the following statements about the C4 cycle is true ?

a.) C4 plants uses the enzyme phosphoenolpyruvate carboxylase (PEPCase), rather than rubisco

b.) Unlike rubisco, O2 does not compete with HCO3 − in the carboxylation catalyzed by PEPCase

c.)  initial carboxylation catalyzes in bundle sheath cells, four-carbon acids formed and flow across the diffusion barrier to the mesophyll cells

d.) during decarboxylation, releasing CO2 that is refixed by rubisco via the Calvin–Benson cycle

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#Question id: 8940

#Unit 9. Diversity of Life Forms

Which of the following is a correct association of an animal germ layer with the tissues or organs to which it gives rise?

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#Question id: 4687

#Unit 3. Fundamental Processes

Multiplicity of infection (moi) is a measure of how many phage particles infect a given bacterial cell within a population?

a) If the average number is one or fewer phage particles per cell, the infection is more likely to result in lysis

b) If the number of phage particles is two or more, it is more likely to produce lysis

c) If the average number is one or fewer phage particles per cell, the infection is more likely to result in lysogney

d) If the number of phage particles is two or more, it is more likely to produce lysogney

which of the following is the correct prediction of moi measurement?

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#Question id: 13042

#Unit 13. Methods in Biology

For analyzing DNA sequences, two techniques have been developed, one is _________ method frequently termed_________, involving the enzymatic synthesis of DNA and stopping the synthesis at specific nucleotides. While another technique, the __________ method of DNA sequencing developed by ___________ is often used for sequencing small fragments of DNA.

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#Question id: 28616

#Unit 2. Cellular Organization

Which of the following SCF complexes containing components directly binds with the E2 ubiquitin-conjugating enzymes? 

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#Question id: 32576

#Unit 2. Cellular Organization

Microtubules are generally nucleated from a specific intracellular location known as a microtubule-organizing center where: