The nutrients that a plant needs are for normal growth and development are acquired through the ____
a. Sun
b. rain
c. leaves
d. roots
e. bark
ANSWER: d
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Why is it that the tongue and cheek epithelium doesn't provide a sufficient anaerobic environment for plaque anaerobes to grow, but the surface of teeth might?
A. The epithelium is supplied with oxygen by capillary beds. This makes it a relatively aerobic environment and hostile to anaerobes. B. The tooth enamel is supplied with oxygen by capillary beds. This makes it a relatively anaerobic environment and hostile to aerobes. C. The surface of the tongue and cheek are constantly scraped by the action of consuming food. Layers of bacterial growth that might help to supply an anaerobic environment are scraped away, exposing lower levels to oxygen-rich air. D. The surface of teeth (especially the molars) have many pits and crevices that can serve as 'pockets' for layers of bacteria to grow in. Once the layers get deep enough, the bottom portions are anaerobic. This isn't possible on the very smooth surface of the tongue and cheek epithelium.
Which hormone prevents the endometrium from breaking down until the placenta secretes enough
hormones to maintain it? a. hGH b. FSH c. estrogen d. hCG e. ADH
The heritability of a trait can be defined as
A. the sum of all phenotypic variation in the population B. the average amount of genetic variation in each individual C. the proportion of variability in a population that is caused by genetic variance D. the absolute measurement of genotypic variation in a population E. the proportion of variability caused by the environment
The removal of nutrients from nutrient cycling when those nutrients are converted to biomass is referred to as nutrient ________.
Fill in the blank(s) with the appropriate word(s).