Simple fruits are derived from ________
a. separate ovaries of one flower
b. none of the choices
c. fused ovaries of separate flowers
d. one ovary
d
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Match the following items with the correct phrases.
_______1. Enable certain strains of Neisseria gonorrhoeae to adhere to the inner walls of the urethra. _______2. Enable Streptococcus pneumoniae to avoid being phagocytized early in the infection. _______3. A virulence factor specifically associated with Streptococcus pyogenes. _______4. Enable some bacteria to penetrate deeper and deeper into tissues. _______5. Enable some staphylococci and streptococci to dissolve clots. a. capsules b. pili c. M-protein d. kinases e. hyaluronidases
A narrow hybrid zone separates the toad species Bombina bombina and Bombina variegata. What is true of those alleles that are unique to the parental species?
A) Such alleles should be absent. B) Their allele frequency should be nearly the same as the allele frequencies in toad populations distant from the hybrid zone. C) The alleles' heterozygosity should be higher among the hybrid toads than in toad populations distant from the hybrid zone. D) Their allele frequency on one edge of the hybrid zone should roughly equal their frequency on the opposite edge of the hybrid zone.
Which is another name for bone cells that remain alive even after the extracellular matrix becomes hardened with calcium phosphate crystals?
A. leukocytes B. fibrocytes C. chrondrocytes D. erythrocytes E. osteocytes
In plants, the light-dependent reactions require
A. Calvin cycle enzymes. B. ATP. C. O2. D. glucose. E. NADP+.