A hermaphrodite is an organism that:
A) can select the sex of its offspring.
B) possesses both male and female sex organs.
C) generally reproduces asexually.
D) usually stores sperm in female structures for months after copulation.
E) does not require males for sexual reproduction.
Answer: B
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Inflammation helps to fight infection by
A) creating an environment in the body that is hostile to pathogens. B) producing antibodies that kill viruses and bacteria. C) limiting the number of phagocytes at the infection site. D) producing collectins, cytokines, and red blood cells.
Which of the following is a difference between
movement in the xylem and movement in the phloem?
a. movement in the phloem is by a pushing action; movement in the xylem is by a pulling action b. movement in the phloem occurs through nucleated cells; movement in the xylem occurs through non-nucleated cells c. movement in the phloem is always down; movement in the xylem is always up d. movement in the phloem starts in the roots; movement in the xylem starts in the leaves e. all of these are differences between movement in the xylem and movement in the phloem
As energy passes through a food chain, approximately ____ percent is lost as it passes through each trophic level.
A. 10 B. 25 C. 50 D. 90
Which of the following statements about the types and subtypes of the influenza (flu) virus is FALSE?
A. Flu subtype is determined by the kinds of proteins representing the H and N protein spikes making up the capsid of the virus. B. The A(H2N2) and the A(H3N2) strains of the virus require different vaccines. C. Of the three major types of flu virus (A, B, and C), only Type A can occur in humans, other mammals, and birds. D. High mutation rates create more diversity in strains of flu than does genetic recombination. E. Genetic recombination between influenza and other types of viruses is common.