A positive allosteric effector will ________ the activity of an enzyme while a negative effector will ________ the activity.

Fill in the blank(s) with the appropriate word(s).


increase; decrease

Biology & Microbiology

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In an atom, the number of neutrons determines most specifically the ________.

A. chemical properties B. chemical element C. ion state D. isotope

Biology & Microbiology

Which of the following lycophytes is not properly matched to its description?

A. lycopodium: grow low to the ground, have branching stems and leaves that grow in a helical pattern B. selaginella: leaves are held in a single plane giving their branched stems a distinctive appearance; many grow as epiphytes C. quillworts (isoetes): small plants that live along the margins of lakes and streams D. tree-sized lycophytes: possess a vascular cambium; these can still be found today in tropical forests in Africa

Biology & Microbiology

How can a fusion protein be formed?

A. by removing a portion of the gene, forming a shorter gene and therefore a shorter protein B. by site-directed mutagenesis, where a fragment is replaced with a synthetic sequence containing the altered DNA sequence C. by ligating together the sequences of two different genes, creating a new hybrid gene. When expressed, the new gene product is a fusion of the two gene products. D. by the recombination of two proteins in a bacterial cell to form a new hybrid protein E. by using oligonucleotide-directed mutagenesis to introduce mutations that cause the expressed protein to fuse to other proteins

Biology & Microbiology

The site where the old DNA strands separate and new DNA strands will be synthesized is called the ________.

A. rolling circle B. primer C. Okazaki fragment D. replication fork E. template

Biology & Microbiology