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Which of the following is not true of helicase?

lt "unzips DNA by breaking hydrogen bonds between nitrogenous bases

It can only unzip DNA in a 3'à 5' direction

Unzipping starts at multiple points in the DNA, known as replication origins

Topoisomerase works ahead of the helicase to unwind the tightly coiled DNA


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Assume the mating of two dogs from different breeds that both show an excessive bleeding disorder. In one breed, the condition is an autosomal recessive, and in the other a sex-linked recessive. The dogs used are an affected male Lab and an affected female Doberman. The progeny resulting from the mating are: 1. All normal females 2. All affected males Which breed has the sex-linked disorder and what is the genotype for that breed at both loci?


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While studying for your molecular genetics test, your friend says that during translation, the polypeptide chain is always located in the P site of the ribosome. Is your friend correct? Refer to the process of polypeptide production in the ribosomes to explain.


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