Which of the following could be true if a plant cell is exposed to a toxin that makes the thylakoid membrane freely permeable to hydrogen ions?
What will be an ideal response?
There would be no ATP available to drive carbohydrate synthesis in the Calvin cycle.
The amount of NADPH in the chloroplast would increase.
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Which of the following are arranged in the sequence in which the various taxa first appeared in time?
A. bacteria, protists, charophyceans, liverworts, lycophytes, gnetophytes, angiosperms B. Archaea, protists, charophyceans, mosses, ferns, conifers, flowering plants C. bacteria, protists, charophyceans, mosses, cycads, angiosperms D. prokaryotes, protists, charophyceans, mosses, ferns, conifers, flowering plants E. All the other choices provided are correct
A blastocyst ____
a. releases hormones in the myometrium b. releases the egg into the oviduct c. implants in the endometrium d. matures into a chorion e. metabolically supports embryonic and fetal development
At which stage is the human embryo most susceptible to toxic substances?
A) During the fourth and fifth months B) During organogenesis C) During cleavage D) Just before birth E) During the last trimester
A person whose eyeball is shorter than normal suffers from
A) hyperopia. B) myopia. C) astigmatism. D) presbyopia.