What is the main component of an animal cell membrane?
A. phospholipids
B. polynucleotides
C. aquaporins
D. glycolipids
E. cholesterol
A
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How many chromosomes are found in a single human cell at the end of each of the following mitotic stages? ________ prophase ________ metaphase ________ anaphase ________ telophase
What will be an ideal response?
In E. coli the enzyme responsible for creating unsaturated bonds from saturated ones in the fatty acids of the cell membrane is ________.
Fill in the blank(s) with the appropriate word(s).
Target cells for steroid hormones and thyroid hormones do not have membrane receptors for these hormones because
they ____.
a. stimulate the cell by changes in electrical activity b. are hydrophobic c. enter the cell by ion channels d. are small enough to diffuse directly into the cell e. dissolve readily in the extracellular fluid (ECF)
Dicot flowers consist of four rings of structures, including all of the following except
a. petals. b. stamens. c. carpels. d. sepals e. bracts.