Transport of a molecule across a cell membrane by facilitated diffusion ____
a. does not exhibit specificity for a particular type of molecule
b. requires the input of energy
c. depends on a concentration gradient
d. goes against the concentration gradient
e. allows non-polar uncharged molecules to diffuse across a membrane
ANSWER: c
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Which three organelles are involved in the glycolate pathway?
A) lysosome, chloroplast, rough endoplasmic reticulum B) mitochondrion, nucleus, lysosome C) peroxisome, smooth endoplasmic reticulum, chloroplast D) peroxisome, chloroplast, mitochondrion E) Golgi complex, peroxisome, lysosome
Which element is the basis for the macromolecules found in living things?
A) carbon B) hydrogen C) nitrogen D) oxygen
The role of a metabolite that controls a repressible operon is to
A) bind to the promoter region and decrease the affinity of RNA polymerase for the promoter. B) bind to the operator region and block the attachment of RNA polymerase to the promoter. C) increase the production of inactive repressor proteins. D) bind to the repressor protein and inactivate it. E) bind to the repressor protein and activate it.
The period that begins at week 9 of development is the ________
Fill in the blank(s) with correct word