Why is glycolysis believed to have evolved early in the history of life?
A. It splits a 6-carbon molecule into two 3-carbon molecules.
B. It is present in most every type of cell.
C. It does not require oxygen.
D. It breaks down sugar.
E. It produces energy.
Answer: B
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Fungi spores are haploid; what distinguishes haploid spores?
A) Like diploid organisms, haploid spores have a double set of chromosomes. B) Haploid spores have a single set of chromosomes, half the number of chromosomes of diploid organisms. C) Haploid spores have a double set of chromosomes, half the number of chromosomes of diploid organisms. D) Like diploid organisms, haploid spores have a single set of chromosomes.
Which of the following statements is most likely true?
(a) Water is transported actively against a concentration gradient by diffusion (b) Water flows into the direction of the lowest water potential (c) Active transport is ATP-independent (d) Osmosis requires impermeable membranes (e) Tracheids in the phloem facilitate active transport of water
If an amphibian zygote is manipulated so that the first cleavage plane does not divide the gray crescent, what is the expected fate of the two daughter cells?
A) The daughter cell with the entire gray crescent will die. B) Both daughter cells will develop normally because amphibians are totipotent at this stage. C) Only the daughter cell with the gray crescent will develop normally. D) Both daughter cells will develop abnormally. E) Both daughter cells will die immediately.
The brief reversal of the electric gradient
across a neuron’s plasma membrane is called a(an)
a. action potential. b. resting potential. c. kinetic potential. d. threshold potential. e. energy potential.