Tail cocking behavior in whales is thought to be for
a. killing prey.
b. attracting mates.
c. aggression.
d. preparation for a dive.
e. dislodging parasites.
C
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On reaching the oocyte, a human sperm cell must pass through what layer(s) before it can fuse with the plasma membrane of the egg?
What will be an ideal response?
What is the term for two genes from two different species that are similar in sequence and serve the same function in each species?
A. Related genes B. Paralogs C. Gene family D. Orthologs
A phenol red glucose broth with a Durham tube has been inoculated and incubated. After 48 hours, the broth is turbid and bright yellow and approximately half of the contents of the Durham tube contains bubbles. Interpret these results.
a. The organism will ferment lactose as well. b. The organism is fermenting glucose. c. The organism is an obligate anaerobe. d. The organism is fermenting lactose and producing ethanol and CO2.
Axial filaments are composed of
a. the outer membrane. b. endoflagella. c. axial fibers.