Viruses
consist of only a single cell.
are smaller than cells.
consist of multiple cells.
contain a nucleus.
are alive
are smaller than cells.
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If pyruvate oxidation is blocked, what will happen to the levels of oxaloacetate and citric acid in the citric acid cycle shown in the accompanying figure?
A) There will be no change in the levels of oxaloacetate and citric acid. B) Oxaloacetate will decrease and citric acid will accumulate. C) Oxaloacetate will accumulate and citric acid will decrease. D) Both oxaloacetate and citric acid will decrease. E) Both oxaloacetate and citric acid will accumulate.
Gene interactions in which an allele of one gene modifies or prevents expression of alleles of another gene is known as __________
A) complete dominance B) incomplete dominance C) codominance D) epistasis E) incomplete penetrance
Which of the following functions is not associated with the presence of feathers in birds?
a. temperature regulation b. minimization of water loss c. respiration d. flight e. protection
The main difference between therapeutic cloning and reproductive cloning is that
A. in therapeutic cloning, embryonic stem cells are extracted from the blastocyst, while in reproductive cloning, the blastocyst is kept intact and implanted into a surrogate mother. B. unlike cells used for reproductive cloning, cells grown for therapeutic purposes do not display genetic imprinting problems. C. somatic cell nuclear transfer is used for therapeutic cloning, while gametic cell nuclear transfer is used in reproductive cloning. D. unlike cells used for reproductive cloning, cells grown for therapeutic purposes do not require the destruction of embryos.