Chlorophyll a absorbs which color(s) of light?
a. red
b. green
c. violet
d. red, violet, and orange
e. red, violet, and green
d
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Zuzu is a white cat. She is genotype Ww for the "white masking gene" that reduces the number of melanocytes (pigment-containing cells). As a result, her body makes pigment, but it cannot get into the cells where it would color the fur. Zuzu's white masking gene is ________ to the melanin pigment gene because it prevents full expression of the pigment.
A) recessive B) pleiotropic C) epistatic D) dominant
Most organisms are dependent upon plants
because
a. plants produce oxygen as a by-product of photosynthesis. b. as producers, they form the base of food chains. c. they function to prevent erosion and reduce desertification. d. as they remove carbon dioxide from the atmosphere, they reduce the problems generated by the greenhouse effect. e. all of these apply
Bacteria methylate their DNA in order to:
a. prepare for DNA replication. b. prepare for mitosis. c. effectively infect other cells. d. protect it from restriction enzymes. e. prevent viral DNA from hybridizing with bacterial DNA.
Which type of cell directly attacks infected cells?
a. Bacterial cells b. Helper T-cells c. Cytotoxic T-cells d. Cancerous cells