Gram-positive bacteria are colored purple by the Gram stain because:
a. they have circular DNA molecules called plasmids that repel the stain.
b. they have a capsule that lies outside the cell wall.
c. they have a layer of glycoprotein called peptidoglycan outside of the cell membrane.
Answer: c. they have a layer of glycoprotein called peptidoglycan outside of the cell membrane.
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In flowering plants, one sperm nucleus fuses with an
egg nucleus, and a zygote forms that develops into an embryo. Another sperm nucleus a. fuses with a primary endosperm cell to produce three cells, each with one nucleus. b. fuses with a primary endosperm cell to produce one cell with one diploid nucleus. c. fuses with the endosperm mother cell, forming a primary endosperm cell with a single triploid nucleus. d. fuses with one of the endosperm mother cell nuclei to produce a diploid tissue that serves as the food supply for the embryo. e. degenerates.
When blood levels of cortisol rise above the set
point, secretion(s) of __________ is (are) slowed. a. CRH b. ACTH c. TSH d. STH e. CRH and ACTH
The ________ zone is a range of environmental temperatures within which homeothermic metabolic rates are minimal
Fill in the blank(s) with correct word
Shrinkage of the plasma membrane away from the cell wall when the bacterium is placed in a hypertonic environment is called ________.
A. hypertonolysis B. osmolysis C. plasmolysis D. hydrolysis