_____ are toxic proteins secreted by pathogenic bacteria, whereas _____ are components of the outer membrane of gram-negative pathogens
a. endotoxins...phosphotoxins
b. endotoxins...botulinum toxins
c. toxozymes...endotoxins
d. exotoxins...enterotoxins
e. exotoxins...endotoxins
Answer: e. exotoxins...endotoxins
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The process of asexual reproduction where a diploid embryo develops from an unfertilized egg or from
diploid cells in ovule tissue is called
a. fragmentation. b. protoplast fusion. c. somaclonal section. d. grafting. e. apomixis.
In prophase I of spermatogenesis, there are ____ chromatids
a. 92 b. 23 c. 46 d. half as many (as in somatic cells) e. twice as many (as compared to mature sperm)
Which scientists showed that plants need light to grow?
a) van Helmont and Calvin. b) Priestley and Ingenhousz. c) van Helmont and Priestley. d) Priestley and Calvin.
Most microbial contaminants of food are killed at freezing temperatures.
Answer the following statement true (T) or false (F)