What is evolution?
A) a rare event
B) a process that is constantly occurring at the same rate in all organisms
C) a process that occurs as a result of differences in reproductive fitness
D) a process that occurred only in the past
C
You might also like to view...
These contain enzymes that digest various substances
a. mitochondria b. Golgi bodies c. nuclei d. ribosomes e. lysosomes
What causes a stomach ulcer?
A) Lack of a key nutrient B) Consuming too many calories C) Chronic consumption of spicy food D) A bacterial infection
A human cell containing 22 autosomes and a Y chromosome is
A) a somatic cell of a male. B) a zygote. C) a somatic cell of a female. D) a sperm cell. E) an ovum
Insulin is a protein made in large amounts in cells of the pancreas. These cells secrete insulin into the blood, where it controls the uptake of sugar by body cells. How is insulin transported from the ER to the surface of the cell?
A) Insulin moves along tracks of cytoskeleton proteins. B) Insulin is carried by lysosomes that empty their contents outside the cell. C) Insulin is sent through the cavities (lumen) of the endoplasmic reticulum that attach directly to the plasma membrane. D) Insulin is carried in small sacs of membrane (vesicles) that move from the endoplasmic reticulum to the Golgi apparatus and then to the plasma membrane. E) Insulin moves through plasmodesmata to the surface of the cell.