Within an ecosystem, a tree is a
A) secondary consumer.
B) detritivore.
C) primary consumer.
D) producer.
Answer: D
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In 1880, Walther Flemming identified ________, threadlike bodies seen in dividing cells.
Fill in the blank(s) with the appropriate word(s).
Altruism can be distinguished from reciprocal altruism because altruism is defined as ____ but
reciprocal altruism involves ____.
a. the sacrifice of an individual's reproductive success to help others; the expectation of a future favor in return for present aid b. aid given to nonrelatives; benefits given to close relatives only c. the expectation of a future favor in return for present aid; close relatives helping each other d. low-risk behavior that provides minor benefits to others; high-risk behavior providing major benefits to others e. aid given to relatives; benefits given to nonrelatives only
Bacterial biofilms are important medically because:
a. They may form on catheters b. They are resistant to treatment with antibiotics c. They can form dental plaque d. They are resistant to immune defenses e. All are correct
A whole organism clone is a clone of the organism that:
A) provides the egg cell from which the nucleus is removed. B) provides the nuclear (diploid) DNA. C) serves as the surrogate mother and carries the fetus to term. D) provides the (haploid) sperm cell. E) fertilizes the egg cell.