Which statement is true with regard to human population growth?
A) It is at a zero reproduction rate.
B) Its rate of increase continues to grow at an exponential rate.
C) Its rate of growth is slowing.
D) Its rate of growth is increasing.
E) There is no scientific prediction that can be made about human population growth.
Answer: C
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Review the experiments by Kohler and Lipton described in Fig. 9.5. What is the key difference between blood serum and blood plasma that affects their ability to help fibroblasts grow in culture?
A. Serum contains more platelet cells than plasma, and platelet cells promote cell growth. B. Molecules found in serum promote cell growth; these molecules are not found in plasma. C. Plasma contains more platelet cells than serum, and platelet cells inhibit cell growth. D. Molecules found in plasma inhibit cell growth; these molecules are not found in serum.
Filtrate that is removed from the blood is collected by the:
a. loop of Henle b. glomerulus c. distal tubule d. proximal tubule e. Bowman's capsule
The species concept defined as a group of organisms that are capable of interbreeding to produce fertile offspring is ________
A) the morphospecies concept B) the phylogenetic species concept C) the biological species concept D) the ecological species concept
Which of the following helps maintain the structure of chromosomes and control the activity of genes?
A) the nuclear membrane B) proteins C) centromeres D) ribosomes