Which of the following is NOT a functionally analogous pair?
A) nucleus -nucleiod region
B) mitochondria - prokaryotic plasma membrane
C) chloroplasts - thylakoids
D) cilia - pili
E) 9+2 flagella - bacterial flagella
D
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Mycorrhizae are
a. intertwined roots of different species of plants. b. connecting points between branching roots. c. symbiotic associations between a fungus and plant roots. d. specialized root hairs. e. localized swellings in plant roots filled with nitrogen-fixing bacteria.
Answer questions 120–124 in reference to the five items listed
below. a. 12 b. 23 c. 24 d. 46 e. 47 D 120. How many chromosomes does each somatic cell have in a human male who has two X chromosomes? D 121. Following a gene duplication event involving only five loci, how many chromosomes will a human female have? D 122. How many chromosomes are present in the somatic cells of a child born with Down syndrome (trisomy 21)? D 123. How many chromosomes are present in each cell of the germ cell line for a tetraploid species where its normal complement of chromosomes is 48? D 124. The normal sperm cell of species X carries 11 chromosomes. Following nondisjunction in the formation of secondary spermatocytes and their subsequent fertilization of normal ova, some of the zygotes will have 21 chromosomes, others will have 22, and the remainder will have how many chromosomes?
Microbial community ecology: lecture summary
What will be an ideal response?
Which of the following is known to reduce nitrates to nitrites?
A. Calcium B. Zinc C. Potassium D. Iron