Extensive growth of the streptococci in a thick bacterial layer on acidic glycoproteins on the teeth is called
A) dental plaque.
B) dental caries.
C) dental biofilm.
D) periodontitis.
Answer: A
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“Germination” can refer to two different events:
A. the arrival of the pollen grain at the ovule, and the growth of the seedling from the seed. B. the development of the flower, and the growth of the seedling from the seed. C. the growth of the pollen tube into the embryo sac, and the growth of the seedling from the seed. D. the development of the fruit from the ovary, and the growth of the seedling from the seed.
As pyruvate is prepared for the citric acid cycle, it undergoes a process of
A) reductive carboxylation. B) oxidative decarboxylation. C) oxidative carboxylation. D) reductive decarboxylation. E) substrate level phosphorylation.
Which of the following is an incorrect match?
A) Golgi apparatus- protein alteration and packaging B) ribosomes- protein synthesis C) lysosomes- cellular digestion D) mitochondria- production of cellular ATP E) smooth endoplasmic reticulum- storage of water
The government runs an experiment where a random sample of 200 adults over 40 get a 5% tax cut and a random sample of 200 adults under 40 get no tax cut. Their results show that spending, on average, increased 8% with a 5% tax cut. They conclude that a 5% tax cut for all adult Americans will increase spending by 8%. Why is this logic flawed?
A. The measured effect of the treatment on the treated may be biased. B. A 5% tax cut for all Americans suffers from selection bias. C. The effect of the treatment on the treated may not be the average treatment effect. D. The logic is not flawed.