Which two genera have members that can evade the human immune system by frequently changing their surface proteins?
1. Plasmodium
2. Trichomonas
3. Paramecium
4. Trypanosoma
5. Entamoeba
A) 1 and 4
B) 2 and 3
C) 2 and 4
D) 4 and 5
A
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Killer lymphocytes can elicit self-destruct mechanisms in target cells by interacting with
A) Fas ligand. B) Fas receptors. C) Ras ligand. D) adaptor proteins. E) procaspase.
The protein Sonic Hedgehog (SHH) plays a role in specifying the identity of digits (such as fingers and toes) in mammals. Several digits arise directly from cells that both express and respond to secreted SHH. What type of signaling would this be considered?
A. Direct contact B. Paracrine C. Endocrine D. Synaptic E. Autocrine
The seeds of fleshy fruits are most likely to be spread by:
a. animals b. water c. wind d. explosion e. insects
Which of the following prokaryotic nutritional
groups use CO2 and sunlight to produce energy? a. photoautotrophs b. chemoautotrophs c. photoheterotrophs d. chemoheterotrophs e. all of these