What process is involved during rigor mortis?
The muscles’ proteins, actin and myosin, gradually break down, allowing the muscles to become stiff.
Without ATP, cross-bridges cannot be broken, and within three to four hours after death, the muscles become stiff.
There is an excess of ATP, and within three to four hours after death, the muscles become stiff as they go into tetanus.
B. Without ATP, cross-bridges cannot be broken, and within three to four hours after death, the muscles become stiff.
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Which of the following statements correctly characterizes the relationship between NADP+/NADPH and NAD+/NADH?
A) Both are used extensively during photosynthesis in oxygenic phototrophs. B) Neither are helpful to oxygenic phototrophs. C) NADP+/NADPH has an extra phosphate compared to NAD+/NADH. D) NADP+/NADPH is used primarily for catabolic reactions. E) Only NAD+/NADH is used to transport electrons and protons.
The primary cause of desertification in the world today is
a. increased salinity resulting from irrigation practices. b. overgrazing of marginal lands. c. clearing and degradation of tropical forests. d. herbicide and fertilizer runoff. e. use of water for industry.
The ratio of carbon fixed (photosynthesis) per unit of water lost (transpiration) is called the ________ efficiency
Fill in the blank(s) with correct word
How does a nucleus in G2 differ from a nucleus in G1?
a. The G2 nucleus has double the amount of DNA as the G1 nucleus. b. DNA synthesis occurs only in the G1 phase. c. Inactive cells are arrested only in the G2 phase. d. During G2, the cell prepares for S phase. e. All of the above