Why is ATP an important molecule in metabolism?
A) Its hydrolysis provides an input of free energy for exergonic reactions.
B) It provides energy coupling between exergonic and endergonic reactions.
C) Its terminal phosphate group contains a strong covalent bond that, when hydrolyzed, releases free energy.
D) Its terminal phosphate bond has higher energy than the other two phosphate bonds.
E) It is one of the four building blocks for DNA synthesis.
Answer: B
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Endospore-forming bacteria like Bacillus species begin the sporulation process with an asymmetric cell division to produce two cells with different fates. One will differentiate into the endospore, and the other is the sporangium that will ultimately lyse to release the mature endospore. (Review Process Figure 4.24.) During this asymmetric cell division, one of the compartments does not receive an intact copy of the chromosome. Which compartment can function with only part of the genome and why?
A. The endospore; it is a dormant stage and requires very little to maintain its dormancy. B. The sporangium; it supports endospore development and then lyses. C. The sporangium; much of the genome is "junk DNA" and not required for endospore maturation. D. The endospore; the endospore is built from the outside via the sporangium and not from the inside.
If a living plant cell is placed in a beaker with pure water, it will take up water until ____
a. within the cell ?P = ??S b. it bursts c. its ?P = 0 d. its ?S = ?S of the pure water e. its ?S = 0
Which of the following is a function of the glands indicated by “A”?
1.secretes calcitonin
2.secretes thyroid releasing hormone
3.secretes iodine-containing molecules
4.secretes parathyroid hormone
Pairing of homologues and crossing over occur during ____
a. anaphase I b. metaphase II c. prophase I d. prophase II e. telophase II