Which of the following statements is false?
a. All the cells of a human have the same genes.
b. Only red blood cells have hemoglobin genes.
c. Different genes are activated depending on the
cell they are in.
d. Liver cells and brain cells differ mostly in form
and function, not in the genes they have.
e. Cells don’t express all of their genes all of the
time.
Answer: b
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Name the two elements needed for procedures similar to bacterial transformation to be useful in human gene therapy.
What will be an ideal response?
Shigellosis is typically acquired via the respiratory route.
a. true b. false
A candy bar contains 108 calories per serving. There are 4 grams of carbohydrate, 5 grams of protein, and 8 grams of fat in a serving. How many of the calories come from fat?
A. 16 B. 72 C. 18 D. 20
In vertebrates, food is moved along the length of the digestive system by __________.
a. peristalsis b. active transport across cell membranes c. diffusion and osmosis d. sequential contraction of bands of skeletal muscles e. sphincter contraction