One characteristic of class Bivalvia is that they:a
are active swimmers.
b. use a radula to feed on algae.
c. possess two shells with a hinge.
d. use their mantle for locomotion.
e. possess shells of overlapping plates
c
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A small molecule of RNA is transcribed in the nucleus. It is folded, cleaved by dicer protein, and then binds to a target
molecule of mRNA. This molecule of RNA must be ____.
a. miRNA b. siRNA c. an mRNA that was not properly capped d. an mRNA that never received its poly-A tail e. a transcript for a repressor protein
Research indicates that ibuprofen, a drug used to relieve inflammation and pain, is a mixture of two enantiomers; that is, molecules that _____
A) have identical chemical formulas but differ in the branching of their carbon skeletons B) are mirror images of each other C) differ in the location of their double bonds D) differ in the arrangement of atoms around their double bonds
Which organelles supply energy (ATP) to plant cells?
A.) ribosomes B.) centrosomes C.) mitochondria D.) vacuoles
Altering the three-dimensional structure of an enzyme might change the amount of energy needed for a reaction. prevent the substrate from binding the enzyme's active site. change the type of substrate that binds the enzyme's active site. change the type of product produced in the reaction. allow the reaction to occur at a faster rate.
What will be an ideal response?