Single-celled Paramecium live in pond water (a hypotonic environment). They have a structural feature, a contractile vacuole, which enables them to osmoregulate
If you observed them in the following solutions, at which sucrose concentration (in millimolars, mM) would you expect the contractile vacuole to be most active?
A) 0.0 mM sucrose
B) 0.05 mM saline
C) 0.08 mM sucrose
D) 1.0 mM saline
Answer: A
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A typical gene has _____ enhancer sequence(s); each enhancer sequence has ____ regulatory transcription factor
A. several; one B. several; several C. from 10-20; from 2-10 D. one; several E. one; from 2-10
A newborn is identified as having sickle-cell anemia. While both parents are healthy, a screening of both parents will most likely reveal:
A. both mother and father are carriers of a mutant ? chain gene. B. only one parent has a mutant ? chain gene since mutation is dominant. C. both mother and father are carriers of a mutant ? chain gene. D. only one parent has a mutant ? chain gene since mutation is dominant. E. both parents carry a mutant hemoglobin gene and are highly susceptible to malaria.
Dendritic cells present antigens on their surface in the context of ____
a. class I major histocompatibility complex (MHC) proteins b. class II MHC proteins c. antibodies d. B cell receptors e. T cell receptors
The very first primates were
A. monkeys. B. gibbons. C. prosimians. D. apes.