Humans are unable to get metabolic energy from cellulose because:
A. cellulose contains very little chemical energy.
B. cellulose is not part of a normal diet.
C. cellulose digesting enzymes are absent from the human gut.
D. cellulose does not taste good.
E. cellulose is present in large quantities in the gut.
C
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A time lag in the response of survivorship and fecundity to a population's density can occur because ____ is usually
determined by the availability of resources at some time in the past.
a. death b. immigration c. fecundity d. competition e. population growth
Retroviruses and bacteria such as Agrobacterium tumefaciens are commonly used to produce
A) genetically identical clones of an organism. B) yeast hybrid systems. C) polyclonal and monoclonal antibodies. D) transgenic organisms. E) monoclonal antibodies.
Which of the following substances stimulates contractions in uterine smooth muscle during labor?
A) progesterone B) estrogen C) oxytocin D) prolactin
Specifically, molecules of chlorophyll are located in the membranes of sacs called
A) vesicles. B) stoma. C) thylakoids. D) grana. E) stroma.