As a general principle of gene regulation through operons, regulatory genes encode
A) trans-acting proteins that interact with cis-acting DNA elements.
B) cis-acting proteins that interact with cis-acting DNA elements.
C) cis-acting proteins that interact with trans-acting DNA elements.
D) trans-acting proteins that interact with trans-acting DNA elements.
A) trans-acting proteins that interact with cis-acting DNA elements.
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The function of the DNA polymerase is to catalyze
A) the addition of deoxynucleotides. B) the formation of RNA primers. C) the addition of ribonucleotides. D) hydrogen bonding between complementary base pairs.
What type of joint consists of bones that are tied together by fibrous tissue with little or no space between them? (little to no movement)
What will be an ideal response?
A mixotroph loses its plastids yet continues to survive. Which of the following most likely accounts for its continued survival?
A) It relies on photosystems that float freely in its cytosol. B) It must have gained extra mitochondria when it lost its plastids. C) It engulfs organic material by phagocytosis. D) It has an endospore. E) It is protected by a siliceous case.
Crossing over _________________________.
A. occurs during mitosis B. involves centrioles C. involves breakages and exchanges between sister chromatids D. results in new combinations of alleles being channeled into the daughter cells E. only occurs in animal cells.