Explain which process evolved first-glycolysis or the Krebs cycle.
What will be an ideal response?
Glycolysis evolved first because cells of all types of organisms are capable of this process. The Krebs cycle did not arise until after photosynthetic organisms began adding oxygen to the atmosphere because the Krebs cycle requires oxygen, while glycolysis does not.
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Different ratios occur in crosses with single gene pairs or two gene pairs. What types of ratios are likely to occur in crosses dealing with a single gene pair?
A) 9:3:3:1, 1:2:1 B) 1:1:1:1, 1:4:6:4:1 C) 3:1, 1:1, 1:2:1 D) 4:1, 1:1, 1:4:1
The production of second messengers in signal transduction offers at least two advantages, speed and
A. specificity. B. amplification. C. one-to-one stochiometry. D. reversibility. E. affinity.
Plants control the diffusion of water vapor and gases across the epidermis by means of ____
a. xylem b. phloem c. periderm d. companion cells e. stomata
Four of the five answers listed below are related by a common action that retains nitrogen in the
biomass. Select the exception. a. decomposition b. ammonification c. nitrification d. nitrogen fixation e. denitrification