How many nucleotides compose one codon?
a. 2
b. 3
c. 5
d. 6
e. 16
B
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Answer the following statements true (T) or false (F)
1. Malpighian tubules of insects secrete rather than filter to eliminate waste products. 2. The filtrate that leaves the proximal convoluted tubule is much more concentrated than the blood in humans. 3. The blood supply to the loop of Henle also exhibits a countercurrent arrangement. 4. Based on phylogenetic analyses of the mineralcorticoid and glucocorticoid receptors and the presence or absence of their ligands (glucocorticoids and aldosterone) in certain vertebrates, it would appear that hormones always evolve prior to their receptors. 5. It would be reasonable to assume that environmental cues such as photoperiod and temperature might regulate animal reproduction.
The envelope of the flu virus is made of
a. cellulose b. capsid protein c. phospholipids d. peptidoglycan and capsid protein e. phospholipid and capsid protein
Gram-negative bacteria in the genus ________ prey on other Gram-negative bacteria
A) Bdellovibrio B) Chlamydia C) Rickettsia D) Mycoplasma E) Caulobacter
Which of the following microorganisms have been referred to as energy parasites?
A. rickettsias B. vibrios C. chlamydias D. spirochetes E. Borrelia